text: /*  Prototype JavaScript framework, version 1.6.0.1
   *  (c) 2005-2007 Sam Stephenson
   *
   *  Prototype is freely distributable under the terms of an MIT-style license.
   *  For details, see the Prototype web site: http://www.prototypejs.org/
   *
   *--------------------------------------------------------------------------*/
  
  var Prototype = {
    Version: '1.6.0.1',
  
    Browser: {
      IE:     !!(window.attachEvent && !window.opera),
      Opera:  !!window.opera,
      WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
      Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
      MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
    },
  
    BrowserFeatures: {
      XPath: !!document.evaluate,
      ElementExtensions: !!window.HTMLElement,
      SpecificElementExtensions:
        document.createElement('div').__proto__ &&
        document.createElement('div').__proto__ !==
          document.createElement('form').__proto__
    },
  
    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
  
    emptyFunction: function() { },
    K: function(x) { return x }
  };
  
  if (Prototype.Browser.MobileSafari)
    Prototype.BrowserFeatures.SpecificElementExtensions = false;
  
  
  /* Based on Alex Arnell's inheritance implementation. */
  var Class = {
    create: function() {
      var parent = null, properties = $A(arguments);
      if (Object.isFunction(properties[0]))
        parent = properties.shift();
  
      function klass() {
        this.initialize.apply(this, arguments);
      }
  
      Object.extend(klass, Class.Methods);
      klass.superclass = parent;
      klass.subclasses = [];
  
      if (parent) {
        var subclass = function() { };
        subclass.prototype = parent.prototype;
        klass.prototype = new subclass;
        parent.subclasses.push(klass);
      }
  
      for (var i = 0; i < properties.length; i++)
        klass.addMethods(properties[i]);
  
      if (!klass.prototype.initialize)
        klass.prototype.initialize = Prototype.emptyFunction;
  
      klass.prototype.constructor = klass;
  
      return klass;
    }
  };
  
  Class.Methods = {
    addMethods: function(source) {
      var ancestor   = this.superclass && this.superclass.prototype;
      var properties = Object.keys(source);
  
      if (!Object.keys({ toString: true }).length)
        properties.push("toString", "valueOf");
  
      for (var i = 0, length = properties.length; i < length; i++) {
        var property = properties[i], value = source[property];
        if (ancestor && Object.isFunction(value) &&
            value.argumentNames().first() == "$super") {
          var method = value, value = Object.extend((function(m) {
            return function() { return ancestor[m].apply(this, arguments) };
          })(property).wrap(method), {
            valueOf:  function() { return method },
            toString: function() { return method.toString() }
          });
        }
        this.prototype[property] = value;
      }
  
      return this;
    }
  };
  
  var Abstract = { };
  
  Object.extend = function(destination, source) {
    for (var property in source)
      destination[property] = source[property];
    return destination;
  };
  
  Object.extend(Object, {
    inspect: function(object) {
      try {
        if (Object.isUndefined(object)) return 'undefined';
        if (object === null) return 'null';
        return object.inspect ? object.inspect() : object.toString();
      } catch (e) {
        if (e instanceof RangeError) return '...';
        throw e;
      }
    },
  
    toJSON: function(object) {
      var type = typeof object;
      switch (type) {
        case 'undefined':
        case 'function':
        case 'unknown': return;
        case 'boolean': return object.toString();
      }
  
      if (object === null) return 'null';
      if (object.toJSON) return object.toJSON();
      if (Object.isElement(object)) return;
  
      var results = [];
      for (var property in object) {
        var value = Object.toJSON(object[property]);
        if (!Object.isUndefined(value))
          results.push(property.toJSON() + ': ' + value);
      }
  
      return '{' + results.join(', ') + '}';
    },
  
    toQueryString: function(object) {
      return $H(object).toQueryString();
    },
  
    toHTML: function(object) {
      return object && object.toHTML ? object.toHTML() : String.interpret(object);
    },
  
    keys: function(object) {
      var keys = [];
      for (var property in object)
        keys.push(property);
      return keys;
    },
  
    values: function(object) {
      var values = [];
      for (var property in object)
        values.push(object[property]);
      return values;
    },
  
    clone: function(object) {
      return Object.extend({ }, object);
    },
  
    isElement: function(object) {
      return object && object.nodeType == 1;
    },
  
    isArray: function(object) {
      return object && object.constructor === Array;
    },
  
    isHash: function(object) {
      return object instanceof Hash;
    },
  
    isFunction: function(object) {
      return typeof object == "function";
    },
  
    isString: function(object) {
      return typeof object == "string";
    },
  
    isNumber: function(object) {
      return typeof object == "number";
    },
  
    isUndefined: function(object) {
      return typeof object == "undefined";
    }
  });
  
  Object.extend(Function.prototype, {
    argumentNames: function() {
      var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
      return names.length == 1 && !names[0] ? [] : names;
    },
  
    bind: function() {
      if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
      var __method = this, args = $A(arguments), object = args.shift();
      return function() {
        return __method.apply(object, args.concat($A(arguments)));
      }
    },
  
    bindAsEventListener: function() {
      var __method = this, args = $A(arguments), object = args.shift();
      return function(event) {
        return __method.apply(object, [event || window.event].concat(args));
      }
    },
  
    curry: function() {
      if (!arguments.length) return this;
      var __method = this, args = $A(arguments);
      return function() {
        return __method.apply(this, args.concat($A(arguments)));
      }
    },
  
    delay: function() {
      var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
      return window.setTimeout(function() {
        return __method.apply(__method, args);
      }, timeout);
    },
  
    wrap: function(wrapper) {
      var __method = this;
      return function() {
        return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
      }
    },
  
    methodize: function() {
      if (this._methodized) return this._methodized;
      var __method = this;
      return this._methodized = function() {
        return __method.apply(null, [this].concat($A(arguments)));
      };
    }
  });
  
  Function.prototype.defer = Function.prototype.delay.curry(0.01);
  
  Date.prototype.toJSON = function() {
    return '"' + this.getUTCFullYear() + '-' +
      (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
      this.getUTCDate().toPaddedString(2) + 'T' +
      this.getUTCHours().toPaddedString(2) + ':' +
      this.getUTCMinutes().toPaddedString(2) + ':' +
      this.getUTCSeconds().toPaddedString(2) + 'Z"';
  };
  
  var Try = {
    these: function() {
      var returnValue;
  
      for (var i = 0, length = arguments.length; i < length; i++) {
        var lambda = arguments[i];
        try {
          returnValue = lambda();
          break;
        } catch (e) { }
      }
  
      return returnValue;
    }
  };
  
  RegExp.prototype.match = RegExp.prototype.test;
  
  RegExp.escape = function(str) {
    return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
  };
  
  /*--------------------------------------------------------------------------*/
  
  var PeriodicalExecuter = Class.create({
    initialize: function(callback, frequency) {
      this.callback = callback;
      this.frequency = frequency;
      this.currentlyExecuting = false;
  
      this.registerCallback();
    },
  
    registerCallback: function() {
      this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
    },
  
    execute: function() {
      this.callback(this);
    },
  
    stop: function() {
      if (!this.timer) return;
      clearInterval(this.timer);
      this.timer = null;
    },
  
    onTimerEvent: function() {
      if (!this.currentlyExecuting) {
        try {
          this.currentlyExecuting = true;
          this.execute();
        } finally {
          this.currentlyExecuting = false;
        }
      }
    }
  });
  Object.extend(String, {
    interpret: function(value) {
      return value == null ? '' : String(value);
    },
    specialChar: {
      '\b': '\\b',
      '\t': '\\t',
      '\n': '\\n',
      '\f': '\\f',
      '\r': '\\r',
      '\\': '\\\\'
    }
  });
  
  Object.extend(String.prototype, {
    gsub: function(pattern, replacement) {
      var result = '', source = this, match;
      replacement = arguments.callee.prepareReplacement(replacement);
  
      while (source.length > 0) {
        if (match = source.match(pattern)) {
          result += source.slice(0, match.index);
          result += String.interpret(replacement(match));
          source  = source.slice(match.index + match[0].length);
        } else {
          result += source, source = '';
        }
      }
      return result;
    },
  
    sub: function(pattern, replacement, count) {
      replacement = this.gsub.prepareReplacement(replacement);
      count = Object.isUndefined(count) ? 1 : count;
  
      return this.gsub(pattern, function(match) {
        if (--count < 0) return match[0];
        return replacement(match);
      });
    },
  
    scan: function(pattern, iterator) {
      this.gsub(pattern, iterator);
      return String(this);
    },
  
    truncate: function(length, truncation) {
      length = length || 30;
      truncation = Object.isUndefined(truncation) ? '...' : truncation;
      return this.length > length ?
        this.slice(0, length - truncation.length) + truncation : String(this);
    },
  
    strip: function() {
      return this.replace(/^\s+/, '').replace(/\s+$/, '');
    },
  
    stripTags: function() {
      return this.replace(/<\/?[^>]+>/gi, '');
    },
  
    stripScripts: function() {
      return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    },
  
    extractScripts: function() {
      var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
      var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
      return (this.match(matchAll) || []).map(function(scriptTag) {
        return (scriptTag.match(matchOne) || ['', ''])[1];
      });
    },
  
    evalScripts: function() {
      return this.extractScripts().map(function(script) { return eval(script) });
    },
  
    escapeHTML: function() {
      var self = arguments.callee;
      self.text.data = this;
      return self.div.innerHTML;
    },
  
    unescapeHTML: function() {
      var div = new Element('div');
      div.innerHTML = this.stripTags();
      return div.childNodes[0] ? (div.childNodes.length > 1 ?
        $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
        div.childNodes[0].nodeValue) : '';
    },
  
    toQueryParams: function(separator) {
      var match = this.strip().match(/([^?#]*)(#.*)?$/);
      if (!match) return { };
  
      return match[1].split(separator || '&').inject({ }, function(hash, pair) {
        if ((pair = pair.split('='))[0]) {
          var key = decodeURIComponent(pair.shift());
          var value = pair.length > 1 ? pair.join('=') : pair[0];
          if (value != undefined) value = decodeURIComponent(value);
  
          if (key in hash) {
            if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
            hash[key].push(value);
          }
          else hash[key] = value;
        }
        return hash;
      });
    },
  
    toArray: function() {
      return this.split('');
    },
  
    succ: function() {
      return this.slice(0, this.length - 1) +
        String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    },
  
    times: function(count) {
      return count < 1 ? '' : new Array(count + 1).join(this);
    },
  
    camelize: function() {
      var parts = this.split('-'), len = parts.length;
      if (len == 1) return parts[0];
  
      var camelized = this.charAt(0) == '-'
        ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
        : parts[0];
  
      for (var i = 1; i < len; i++)
        camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
  
      return camelized;
    },
  
    capitalize: function() {
      return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    },
  
    underscore: function() {
      return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
    },
  
    dasherize: function() {
      return this.gsub(/_/,'-');
    },
  
    inspect: function(useDoubleQuotes) {
      var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
        var character = String.specialChar[match[0]];
        return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
      });
      if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
      return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    },
  
    toJSON: function() {
      return this.inspect(true);
    },
  
    unfilterJSON: function(filter) {
      return this.sub(filter || Prototype.JSONFilter, '#{1}');
    },
  
    isJSON: function() {
      var str = this;
      if (str.blank()) return false;
      str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
      return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
    },
  
    evalJSON: function(sanitize) {
      var json = this.unfilterJSON();
      try {
        if (!sanitize || json.isJSON()) return eval('(' + json + ')');
      } catch (e) { }
      throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
    },
  
    include: function(pattern) {
      return this.indexOf(pattern) > -1;
    },
  
    startsWith: function(pattern) {
      return this.indexOf(pattern) === 0;
    },
  
    endsWith: function(pattern) {
      var d = this.length - pattern.length;
      return d >= 0 && this.lastIndexOf(pattern) === d;
    },
  
    empty: function() {
      return this == '';
    },
  
    blank: function() {
      return /^\s*$/.test(this);
    },
  
    interpolate: function(object, pattern) {
      return new Template(this, pattern).evaluate(object);
    }
  });
  
  if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
    escapeHTML: function() {
      return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
    },
    unescapeHTML: function() {
      return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
    }
  });
  
  String.prototype.gsub.prepareReplacement = function(replacement) {
    if (Object.isFunction(replacement)) return replacement;
    var template = new Template(replacement);
    return function(match) { return template.evaluate(match) };
  };
  
  String.prototype.parseQuery = String.prototype.toQueryParams;
  
  Object.extend(String.prototype.escapeHTML, {
    div:  document.createElement('div'),
    text: document.createTextNode('')
  });
  
  with (String.prototype.escapeHTML) div.appendChild(text);
  
  var Template = Class.create({
    initialize: function(template, pattern) {
      this.template = template.toString();
      this.pattern = pattern || Template.Pattern;
    },
  
    evaluate: function(object) {
      if (Object.isFunction(object.toTemplateReplacements))
        object = object.toTemplateReplacements();
  
      return this.template.gsub(this.pattern, function(match) {
        if (object == null) return '';
  
        var before = match[1] || '';
        if (before == '\\') return match[2];
  
        var ctx = object, expr = match[3];
        var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
        match = pattern.exec(expr);
        if (match == null) return before;
  
        while (match != null) {
          var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
          ctx = ctx[comp];
          if (null == ctx || '' == match[3]) break;
          expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
          match = pattern.exec(expr);
        }
  
        return before + String.interpret(ctx);
      }.bind(this));
    }
  });
  Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
  
  var $break = { };
  
  var Enumerable = {
    each: function(iterator, context) {
      var index = 0;
      iterator = iterator.bind(context);
      try {
        this._each(function(value) {
          iterator(value, index++);
        });
      } catch (e) {
        if (e != $break) throw e;
      }
      return this;
    },
  
    eachSlice: function(number, iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var index = -number, slices = [], array = this.toArray();
      while ((index += number) < array.length)
        slices.push(array.slice(index, index+number));
      return slices.collect(iterator, context);
    },
  
    all: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var result = true;
      this.each(function(value, index) {
        result = result && !!iterator(value, index);
        if (!result) throw $break;
      });
      return result;
    },
  
    any: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var result = false;
      this.each(function(value, index) {
        if (result = !!iterator(value, index))
          throw $break;
      });
      return result;
    },
  
    collect: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var results = [];
      this.each(function(value, index) {
        results.push(iterator(value, index));
      });
      return results;
    },
  
    detect: function(iterator, context) {
      iterator = iterator.bind(context);
      var result;
      this.each(function(value, index) {
        if (iterator(value, index)) {
          result = value;
          throw $break;
        }
      });
      return result;
    },
  
    findAll: function(iterator, context) {
      iterator = iterator.bind(context);
      var results = [];
      this.each(function(value, index) {
        if (iterator(value, index))
          results.push(value);
      });
      return results;
    },
  
    grep: function(filter, iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var results = [];
  
      if (Object.isString(filter))
        filter = new RegExp(filter);
  
      this.each(function(value, index) {
        if (filter.match(value))
          results.push(iterator(value, index));
      });
      return results;
    },
  
    include: function(object) {
      if (Object.isFunction(this.indexOf))
        if (this.indexOf(object) != -1) return true;
  
      var found = false;
      this.each(function(value) {
        if (value == object) {
          found = true;
          throw $break;
        }
      });
      return found;
    },
  
    inGroupsOf: function(number, fillWith) {
      fillWith = Object.isUndefined(fillWith) ? null : fillWith;
      return this.eachSlice(number, function(slice) {
        while(slice.length < number) slice.push(fillWith);
        return slice;
      });
    },
  
    inject: function(memo, iterator, context) {
      iterator = iterator.bind(context);
      this.each(function(value, index) {
        memo = iterator(memo, value, index);
      });
      return memo;
    },
  
    invoke: function(method) {
      var args = $A(arguments).slice(1);
      return this.map(function(value) {
        return value[method].apply(value, args);
      });
    },
  
    max: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var result;
      this.each(function(value, index) {
        value = iterator(value, index);
        if (result == null || value >= result)
          result = value;
      });
      return result;
    },
  
    min: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var result;
      this.each(function(value, index) {
        value = iterator(value, index);
        if (result == null || value < result)
          result = value;
      });
      return result;
    },
  
    partition: function(iterator, context) {
      iterator = iterator ? iterator.bind(context) : Prototype.K;
      var trues = [], falses = [];
      this.each(function(value, index) {
        (iterator(value, index) ?
          trues : falses).push(value);
      });
      return [trues, falses];
    },
  
    pluck: function(property) {
      var results = [];
      this.each(function(value) {
        results.push(value[property]);
      });
      return results;
    },
  
    reject: function(iterator, context) {
      iterator = iterator.bind(context);
      var results = [];
      this.each(function(value, index) {
        if (!iterator(value, index))
          results.push(value);
      });
      return results;
    },
  
    sortBy: function(iterator, context) {
      iterator = iterator.bind(context);
      return this.map(function(value, index) {
        return {value: value, criteria: iterator(value, index)};
      }).sort(function(left, right) {
        var a = left.criteria, b = right.criteria;
        return a < b ? -1 : a > b ? 1 : 0;
      }).pluck('value');
    },
  
    toArray: function() {
      return this.map();
    },
  
    zip: function() {
      var iterator = Prototype.K, args = $A(arguments);
      if (Object.isFunction(args.last()))
        iterator = args.pop();
  
      var collections = [this].concat(args).map($A);
      return this.map(function(value, index) {
        return iterator(collections.pluck(index));
      });
    },
  
    size: function() {
      return this.toArray().length;
    },
  
    inspect: function() {
      return '#<Enumerable:' + this.toArray().inspect() + '>';
    }
  };
  
  Object.extend(Enumerable, {
    map:     Enumerable.collect,
    find:    Enumerable.detect,
    select:  Enumerable.findAll,
    filter:  Enumerable.findAll,
    member:  Enumerable.include,
    entries: Enumerable.toArray,
    every:   Enumerable.all,
    some:    Enumerable.any
  });
  function $A(iterable) {
    if (!iterable) return [];
    if (iterable.toArray) return iterable.toArray();
    var length = iterable.length, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
  }
  
  if (Prototype.Browser.WebKit) {
    function $A(iterable) {
      if (!iterable) return [];
      if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
          iterable.toArray) return iterable.toArray();
      var length = iterable.length, results = new Array(length);
      while (length--) results[length] = iterable[length];
      return results;
    }
  }
  
  Array.from = $A;
  
  Object.extend(Array.prototype, Enumerable);
  
  if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
  
  Object.extend(Array.prototype, {
    _each: function(iterator) {
      for (var i = 0, length = this.length; i < length; i++)
        iterator(this[i]);
    },
  
    clear: function() {
      this.length = 0;
      return this;
    },
  
    first: function() {
      return this[0];
    },
  
    last: function() {
      return this[this.length - 1];
    },
  
    compact: function() {
      return this.select(function(value) {
        return value != null;
      });
    },
  
    flatten: function() {
      return this.inject([], function(array, value) {
        return array.concat(Object.isArray(value) ?
          value.flatten() : [value]);
      });
    },
  
    without: function() {
      var values = $A(arguments);
      return this.select(function(value) {
        return !values.include(value);
      });
    },
  
    reverse: function(inline) {
      return (inline !== false ? this : this.toArray())._reverse();
    },
  
    reduce: function() {
      return this.length > 1 ? this : this[0];
    },
  
    uniq: function(sorted) {
      return this.inject([], function(array, value, index) {
        if (0 == index || (sorted ? array.last() != value : !array.include(value)))
          array.push(value);
        return array;
      });
    },
  
    intersect: function(array) {
      return this.uniq().findAll(function(item) {
        return array.detect(function(value) { return item === value });
      });
    },
  
    clone: function() {
      return [].concat(this);
    },
  
    size: function() {
      return this.length;
    },
  
    inspect: function() {
      return '[' + this.map(Object.inspect).join(', ') + ']';
    },
  
    toJSON: function() {
      var results = [];
      this.each(function(object) {
        var value = Object.toJSON(object);
        if (!Object.isUndefined(value)) results.push(value);
      });
      return '[' + results.join(', ') + ']';
    }
  });
  
  // use native browser JS 1.6 implementation if available
  if (Object.isFunction(Array.prototype.forEach))
    Array.prototype._each = Array.prototype.forEach;
  
  if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
    i || (i = 0);
    var length = this.length;
    if (i < 0) i = length + i;
    for (; i < length; i++)
      if (this[i] === item) return i;
    return -1;
  };
  
  if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
    i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
    var n = this.slice(0, i).reverse().indexOf(item);
    return (n < 0) ? n : i - n - 1;
  };
  
  Array.prototype.toArray = Array.prototype.clone;
  
  function $w(string) {
    if (!Object.isString(string)) return [];
    string = string.strip();
    return string ? string.split(/\s+/) : [];
  }
  
  if (Prototype.Browser.Opera){
    Array.prototype.concat = function() {
      var array = [];
      for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
      for (var i = 0, length = arguments.length; i < length; i++) {
        if (Object.isArray(arguments[i])) {
          for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
            array.push(arguments[i][j]);
        } else {
          array.push(arguments[i]);
        }
      }
      return array;
    };
  }
  Object.extend(Number.prototype, {
    toColorPart: function() {
      return this.toPaddedString(2, 16);
    },
  
    succ: function() {
      return this + 1;
    },
  
    times: function(iterator) {
      $R(0, this, true).each(iterator);
      return this;
    },
  
    toPaddedString: function(length, radix) {
      var string = this.toString(radix || 10);
      return '0'.times(length - string.length) + string;
    },
  
    toJSON: function() {
      return isFinite(this) ? this.toString() : 'null';
    }
  });
  
  $w('abs round ceil floor').each(function(method){
    Number.prototype[method] = Math[method].methodize();
  });
  function $H(object) {
    return new Hash(object);
  };
  
  var Hash = Class.create(Enumerable, (function() {
  
    function toQueryPair(key, value) {
      if (Object.isUndefined(value)) return key;
      return key + '=' + encodeURIComponent(String.interpret(value));
    }
  
    return {
      initialize: function(object) {
        this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
      },
  
      _each: function(iterator) {
        for (var key in this._object) {
          var value = this._object[key], pair = [key, value];
          pair.key = key;
          pair.value = value;
          iterator(pair);
        }
      },
  
      set: function(key, value) {
        return this._object[key] = value;
      },
  
      get: function(key) {
        return this._object[key];
      },
  
      unset: function(key) {
        var value = this._object[key];
        delete this._object[key];
        return value;
      },
  
      toObject: function() {
        return Object.clone(this._object);
      },
  
      keys: function() {
        return this.pluck('key');
      },
  
      values: function() {
        return this.pluck('value');
      },
  
      index: function(value) {
        var match = this.detect(function(pair) {
          return pair.value === value;
        });
        return match && match.key;
      },
  
      merge: function(object) {
        return this.clone().update(object);
      },
  
      update: function(object) {
        return new Hash(object).inject(this, function(result, pair) {
          result.set(pair.key, pair.value);
          return result;
        });
      },
  
      toQueryString: function() {
        return this.map(function(pair) {
          var key = encodeURIComponent(pair.key), values = pair.value;
  
          if (values && typeof values == 'object') {
            if (Object.isArray(values))
              return values.map(toQueryPair.curry(key)).join('&');
          }
          return toQueryPair(key, values);
        }).join('&');
      },
  
      inspect: function() {
        return '#<Hash:{' + this.map(function(pair) {
          return pair.map(Object.inspect).join(': ');
        }).join(', ') + '}>';
      },
  
      toJSON: function() {
        return Object.toJSON(this.toObject());
      },
  
      clone: function() {
        return new Hash(this);
      }
    }
  })());
  
  Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
  Hash.from = $H;
  var ObjectRange = Class.create(Enumerable, {
    initialize: function(start, end, exclusive) {
      this.start = start;
      this.end = end;
      this.exclusive = exclusive;
    },
  
    _each: function(iterator) {
      var value = this.start;
      while (this.include(value)) {
        iterator(value);
        value = value.succ();
      }
    },
  
    include: function(value) {
      if (value < this.start)
        return false;
      if (this.exclusive)
        return value < this.end;
      return value <= this.end;
    }
  });
  
  var $R = function(start, end, exclusive) {
    return new ObjectRange(start, end, exclusive);
  };
  
  var Ajax = {
    getTransport: function() {
      return Try.these(
        function() {return new XMLHttpRequest()},
        function() {return new ActiveXObject('Msxml2.XMLHTTP')},
        function() {return new ActiveXObject('Microsoft.XMLHTTP')}
      ) || false;
    },
  
    activeRequestCount: 0
  };
  
  Ajax.Responders = {
    responders: [],
  
    _each: function(iterator) {
      this.responders._each(iterator);
    },
  
    register: function(responder) {
      if (!this.include(responder))
        this.responders.push(responder);
    },
  
    unregister: function(responder) {
      this.responders = this.responders.without(responder);
    },
  
    dispatch: function(callback, request, transport, json) {
      this.each(function(responder) {
        if (Object.isFunction(responder[callback])) {
          try {
            responder[callback].apply(responder, [request, transport, json]);
          } catch (e) { }
        }
      });
    }
  };
  
  Object.extend(Ajax.Responders, Enumerable);
  
  Ajax.Responders.register({
    onCreate:   function() { Ajax.activeRequestCount++ },
    onComplete: function() { Ajax.activeRequestCount-- }
  });
  
  Ajax.Base = Class.create({
    initialize: function(options) {
      this.options = {
        method:       'post',
        asynchronous: true,
        contentType:  'application/x-www-form-urlencoded',
        encoding:     'UTF-8',
        parameters:   '',
        evalJSON:     true,
        evalJS:       true
      };
      Object.extend(this.options, options || { });
  
      this.options.method = this.options.method.toLowerCase();
  
      if (Object.isString(this.options.parameters))
        this.options.parameters = this.options.parameters.toQueryParams();
      else if (Object.isHash(this.options.parameters))
        this.options.parameters = this.options.parameters.toObject();
    }
  });
  
  Ajax.Request = Class.create(Ajax.Base, {
    _complete: false,
  
    initialize: function($super, url, options) {
      $super(options);
      this.transport = Ajax.getTransport();
      this.request(url);
    },
  
    request: function(url) {
      this.url = url;
      this.method = this.options.method;
      var params = Object.clone(this.options.parameters);
  
      if (!['get', 'post'].include(this.method)) {
        // simulate other verbs over post
        params['_method'] = this.method;
        this.method = 'post';
      }
  
      this.parameters = params;
  
      if (params = Object.toQueryString(params)) {
        // when GET, append parameters to URL
        if (this.method == 'get')
          this.url += (this.url.include('?') ? '&' : '?') + params;
        else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
          params += '&_=';
      }
  
      try {
        var response = new Ajax.Response(this);
        if (this.options.onCreate) this.options.onCreate(response);
        Ajax.Responders.dispatch('onCreate', this, response);
  
        this.transport.open(this.method.toUpperCase(), this.url,
          this.options.asynchronous);
  
        if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
  
        this.transport.onreadystatechange = this.onStateChange.bind(this);
        this.setRequestHeaders();
  
        this.body = this.method == 'post' ? (this.options.postBody || params) : null;
        this.transport.send(this.body);
  
        /* Force Firefox to handle ready state 4 for synchronous requests */
        if (!this.options.asynchronous && this.transport.overrideMimeType)
          this.onStateChange();
  
      }
      catch (e) {
        this.dispatchException(e);
      }
    },
  
    onStateChange: function() {
      var readyState = this.transport.readyState;
      if (readyState > 1 && !((readyState == 4) && this._complete))
        this.respondToReadyState(this.transport.readyState);
    },
  
    setRequestHeaders: function() {
      var headers = {
        'X-Requested-With': 'XMLHttpRequest',
        'X-Prototype-Version': Prototype.Version,
        'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
      };
  
      if (this.method == 'post') {
        headers['Content-type'] = this.options.contentType +
          (this.options.encoding ? '; charset=' + this.options.encoding : '');
  
        /* Force "Connection: close" for older Mozilla browsers to work
         * around a bug where XMLHttpRequest sends an incorrect
         * Content-length header. See Mozilla Bugzilla #246651.
         */
        if (this.transport.overrideMimeType &&
            (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
              headers['Connection'] = 'close';
      }
  
      // user-defined headers
      if (typeof this.options.requestHeaders == 'object') {
        var extras = this.options.requestHeaders;
  
        if (Object.isFunction(extras.push))
          for (var i = 0, length = extras.length; i < length; i += 2)
            headers[extras[i]] = extras[i+1];
        else
          $H(extras).each(function(pair) { headers[pair.key] = pair.value });
      }
  
      for (var name in headers)
        this.transport.setRequestHeader(name, headers[name]);
    },
  
    success: function() {
      var status = this.getStatus();
      return !status || (status >= 200 && status < 300);
    },
  
    getStatus: function() {
      try {
        return this.transport.status || 0;
      } catch (e) { return 0 }
    },
  
    respondToReadyState: function(readyState) {
      var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
  
      if (state == 'Complete') {
        try {
          this._complete = true;
          (this.options['on' + response.status]
           || this.options['on' + (this.success() ? 'Success' : 'Failure')]
           || Prototype.emptyFunction)(response, response.headerJSON);
        } catch (e) {
          this.dispatchException(e);
        }
  
        var contentType = response.getHeader('Content-type');
        if (this.options.evalJS == 'force'
            || (this.options.evalJS && contentType
            && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
          this.evalResponse();
      }
  
      try {
        (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
        Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
      } catch (e) {
        this.dispatchException(e);
      }
  
      if (state == 'Complete') {
        // avoid memory leak in MSIE: clean up
        this.transport.onreadystatechange = Prototype.emptyFunction;
      }
    },
  
    getHeader: function(name) {
      try {
        return this.transport.getResponseHeader(name);
      } catch (e) { return null }
    },
  
    evalResponse: function() {
      try {
        return eval((this.transport.responseText || '').unfilterJSON());
      } catch (e) {
        this.dispatchException(e);
      }
    },
  
    dispatchException: function(exception) {
      (this.options.onException || Prototype.emptyFunction)(this, exception);
      Ajax.Responders.dispatch('onException', this, exception);
    }
  });
  
  Ajax.Request.Events =
    ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
  
  Ajax.Response = Class.create({
    initialize: function(request){
      this.request = request;
      var transport  = this.transport  = request.transport,
          readyState = this.readyState = transport.readyState;
  
      if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
        this.status       = this.getStatus();
        this.statusText   = this.getStatusText();
        this.responseText = String.interpret(transport.responseText);
        this.headerJSON   = this._getHeaderJSON();
      }
  
      if(readyState == 4) {
        var xml = transport.responseXML;
        this.responseXML  = Object.isUndefined(xml) ? null : xml;
        this.responseJSON = this._getResponseJSON();
      }
    },
  
    status:      0,
    statusText: '',
  
    getStatus: Ajax.Request.prototype.getStatus,
  
    getStatusText: function() {
      try {
        return this.transport.statusText || '';
      } catch (e) { return '' }
    },
  
    getHeader: Ajax.Request.prototype.getHeader,
  
    getAllHeaders: function() {
      try {
        return this.getAllResponseHeaders();
      } catch (e) { return null }
    },
  
    getResponseHeader: function(name) {
      return this.transport.getResponseHeader(name);
    },
  
    getAllResponseHeaders: function() {
      return this.transport.getAllResponseHeaders();
    },
  
    _getHeaderJSON: function() {
      var json = this.getHeader('X-JSON');
      if (!json) return null;
      json = decodeURIComponent(escape(json));
      try {
        return json.evalJSON(this.request.options.sanitizeJSON);
      } catch (e) {
        this.request.dispatchException(e);
      }
    },
  
    _getResponseJSON: function() {
      var options = this.request.options;
      if (!options.evalJSON || (options.evalJSON != 'force' &&
        !(this.getHeader('Content-type') || '').include('application/json')) ||
          this.responseText.blank())
            return null;
      try {
        return this.responseText.evalJSON(options.sanitizeJSON);
      } catch (e) {
        this.request.dispatchException(e);
      }
    }
  });
  
  Ajax.Updater = Class.create(Ajax.Request, {
    initialize: function($super, container, url, options) {
      this.container = {
        success: (container.success || container),
        failure: (container.failure || (container.success ? null : container))
      };
  
      options = Object.clone(options);
      var onComplete = options.onComplete;
      options.onComplete = (function(response, json) {
        this.updateContent(response.responseText);
        if (Object.isFunction(onComplete)) onComplete(response, json);
      }).bind(this);
  
      $super(url, options);
    },
  
    updateContent: function(responseText) {
      var receiver = this.container[this.success() ? 'success' : 'failure'],
          options = this.options;
  
      if (!options.evalScripts) responseText = responseText.stripScripts();
  
      if (receiver = $(receiver)) {
        if (options.insertion) {
          if (Object.isString(options.insertion)) {
            var insertion = { }; insertion[options.insertion] = responseText;
            receiver.insert(insertion);
          }
          else options.insertion(receiver, responseText);
        }
        else receiver.update(responseText);
      }
    }
  });
  
  Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
    initialize: function($super, container, url, options) {
      $super(options);
      this.onComplete = this.options.onComplete;
  
      this.frequency = (this.options.frequency || 2);
      this.decay = (this.options.decay || 1);
  
      this.updater = { };
      this.container = container;
      this.url = url;
  
      this.start();
    },
  
    start: function() {
      this.options.onComplete = this.updateComplete.bind(this);
      this.onTimerEvent();
    },
  
    stop: function() {
      this.updater.options.onComplete = undefined;
      clearTimeout(this.timer);
      (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
    },
  
    updateComplete: function(response) {
      if (this.options.decay) {
        this.decay = (response.responseText == this.lastText ?
          this.decay * this.options.decay : 1);
  
        this.lastText = response.responseText;
      }
      this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
    },
  
    onTimerEvent: function() {
      this.updater = new Ajax.Updater(this.container, this.url, this.options);
    }
  });
  function $(element) {
    if (arguments.length > 1) {
      for (var i = 0, elements = [], length = arguments.length; i < length; i++)
        elements.push($(arguments[i]));
      return elements;
    }
    if (Object.isString(element))
      element = document.getElementById(element);
    return Element.extend(element);
  }
  
  if (Prototype.BrowserFeatures.XPath) {
    document._getElementsByXPath = function(expression, parentElement) {
      var results = [];
      var query = document.evaluate(expression, $(parentElement) || document,
        null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
      for (var i = 0, length = query.snapshotLength; i < length; i++)
        results.push(Element.extend(query.snapshotItem(i)));
      return results;
    };
  }
  
  /*--------------------------------------------------------------------------*/
  
  if (!window.Node) var Node = { };
  
  if (!Node.ELEMENT_NODE) {
    // DOM level 2 ECMAScript Language Binding
    Object.extend(Node, {
      ELEMENT_NODE: 1,
      ATTRIBUTE_NODE: 2,
      TEXT_NODE: 3,
      CDATA_SECTION_NODE: 4,
      ENTITY_REFERENCE_NODE: 5,
      ENTITY_NODE: 6,
      PROCESSING_INSTRUCTION_NODE: 7,
      COMMENT_NODE: 8,
      DOCUMENT_NODE: 9,
      DOCUMENT_TYPE_NODE: 10,
      DOCUMENT_FRAGMENT_NODE: 11,
      NOTATION_NODE: 12
    });
  }
  
  (function() {
    var element = this.Element;
    this.Element = function(tagName, attributes) {
      attributes = attributes || { };
      tagName = tagName.toLowerCase();
      var cache = Element.cache;
      if (Prototype.Browser.IE && attributes.name) {
        tagName = '<' + tagName + ' name="' + attributes.name + '">';
        delete attributes.name;
        return Element.writeAttribute(document.createElement(tagName), attributes);
      }
      if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
      return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
    };
    Object.extend(this.Element, element || { });
  }).call(window);
  
  Element.cache = { };
  
  Element.Methods = {
    visible: function(element) {
      return $(element).style.display != 'none';
    },
  
    toggle: function(element) {
      element = $(element);
      Element[Element.visible(element) ? 'hide' : 'show'](element);
      return element;
    },
  
    hide: function(element) {
      $(element).style.display = 'none';
      return element;
    },
  
    show: function(element) {
      $(element).style.display = '';
      return element;
    },
  
    remove: function(element) {
      element = $(element);
      element.parentNode.removeChild(element);
      return element;
    },
  
    update: function(element, content) {
      element = $(element);
      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) return element.update().insert(content);
      content = Object.toHTML(content);
      element.innerHTML = content.stripScripts();
      content.evalScripts.bind(content).defer();
      return element;
    },
  
    replace: function(element, content) {
      element = $(element);
      if (content && content.toElement) content = content.toElement();
      else if (!Object.isElement(content)) {
        content = Object.toHTML(content);
        var range = element.ownerDocument.createRange();
        range.selectNode(element);
        content.evalScripts.bind(content).defer();
        content = range.createContextualFragment(content.stripScripts());
      }
      element.parentNode.replaceChild(content, element);
      return element;
    },
  
    insert: function(element, insertions) {
      element = $(element);
  
      if (Object.isString(insertions) || Object.isNumber(insertions) ||
          Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
            insertions = {bottom:insertions};
  
      var content, t, range;
  
      for (position in insertions) {
        content  = insertions[position];
        position = position.toLowerCase();
        t = Element._insertionTranslations[position];
  
        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) {
          t.insert(element, content);
          continue;
        }
  
        content = Object.toHTML(content);
  
        range = element.ownerDocument.createRange();
        t.initializeRange(element, range);
        t.insert(element, range.createContextualFragment(content.stripScripts()));
  
        content.evalScripts.bind(content).defer();
      }
  
      return element;
    },
  
    wrap: function(element, wrapper, attributes) {
      element = $(element);
      if (Object.isElement(wrapper))
        $(wrapper).writeAttribute(attributes || { });
      else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
      else wrapper = new Element('div', wrapper);
      if (element.parentNode)
        element.parentNode.replaceChild(wrapper, element);
      wrapper.appendChild(element);
      return wrapper;
    },
  
    inspect: function(element) {
      element = $(element);
      var result = '<' + element.tagName.toLowerCase();
      $H({'id': 'id', 'className': 'class'}).each(function(pair) {
        var property = pair.first(), attribute = pair.last();
        var value = (element[property] || '').toString();
        if (value) result += ' ' + attribute + '=' + value.inspect(true);
      });
      return result + '>';
    },
  
    recursivelyCollect: function(element, property) {
      element = $(element);
      var elements = [];
      while (element = element[property])
        if (element.nodeType == 1)
          elements.push(Element.extend(element));
      return elements;
    },
  
    ancestors: function(element) {
      return $(element).recursivelyCollect('parentNode');
    },
  
    descendants: function(element) {
      return $(element).getElementsBySelector("*");
    },
  
    firstDescendant: function(element) {
      element = $(element).firstChild;
      while (element && element.nodeType != 1) element = element.nextSibling;
      return $(element);
    },
  
    immediateDescendants: function(element) {
      if (!(element = $(element).firstChild)) return [];
      while (element && element.nodeType != 1) element = element.nextSibling;
      if (element) return [element].concat($(element).nextSiblings());
      return [];
    },
  
    previousSiblings: function(element) {
      return $(element).recursivelyCollect('previousSibling');
    },
  
    nextSiblings: function(element) {
      return $(element).recursivelyCollect('nextSibling');
    },
  
    siblings: function(element) {
      element = $(element);
      return element.previousSiblings().reverse().concat(element.nextSiblings());
    },
  
    match: function(element, selector) {
      if (Object.isString(selector))
        selector = new Selector(selector);
      return selector.match($(element));
    },
  
    up: function(element, expression, index) {
      element = $(element);
      if (arguments.length == 1) return $(element.parentNode);
      var ancestors = element.ancestors();
      return expression ? Selector.findElement(ancestors, expression, index) :
        ancestors[index || 0];
    },
  
    down: function(element, expression, index) {
      element = $(element);
      if (arguments.length == 1) return element.firstDescendant();
      var descendants = element.descendants();
      return expression ? Selector.findElement(descendants, expression, index) :
        descendants[index || 0];
    },
  
    previous: function(element, expression, index) {
      element = $(element);
      if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
      var previousSiblings = element.previousSiblings();
      return expression ? Selector.findElement(previousSiblings, expression, index) :
        previousSiblings[index || 0];
    },
  
    next: function(element, expression, index) {
      element = $(element);
      if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
      var nextSiblings = element.nextSiblings();
      return expression ? Selector.findElement(nextSiblings, expression, index) :
        nextSiblings[index || 0];
    },
  
    select: function() {
      var args = $A(arguments), element = $(args.shift());
      return Selector.findChildElements(element, args);
    },
  
    adjacent: function() {
      var args = $A(arguments), element = $(args.shift());
      return Selector.findChildElements(element.parentNode, args).without(element);
    },
  
    identify: function(element) {
      element = $(element);
      var id = element.readAttribute('id'), self = arguments.callee;
      if (id) return id;
      do { id = 'anonymous_element_' + self.counter++ } while ($(id));
      element.writeAttribute('id', id);
      return id;
    },
  
    readAttribute: function(element, name) {
      element = $(element);
      if (Prototype.Browser.IE) {
        var t = Element._attributeTranslations.read;
        if (t.values[name]) return t.values[name](element, name);
        if (t.names[name]) name = t.names[name];
        if (name.include(':')) {
          return (!element.attributes || !element.attributes[name]) ? null :
           element.attributes[name].value;
        }
      }
      return element.getAttribute(name);
    },
  
    writeAttribute: function(element, name, value) {
      element = $(element);
      var attributes = { }, t = Element._attributeTranslations.write;
  
      if (typeof name == 'object') attributes = name;
      else attributes[name] = Object.isUndefined(value) ? true : value;
  
      for (var attr in attributes) {
        name = t.names[attr] || attr;
        value = attributes[attr];
        if (t.values[attr]) name = t.values[attr](element, value);
        if (value === false || value === null)
          element.removeAttribute(name);
        else if (value === true)
          element.setAttribute(name, name);
        else element.setAttribute(name, value);
      }
      return element;
    },
  
    getHeight: function(element) {
      return $(element).getDimensions().height;
    },
  
    getWidth: function(element) {
      return $(element).getDimensions().width;
    },
  
    classNames: function(element) {
      return new Element.ClassNames(element);
    },
  
    hasClassName: function(element, className) {
      if (!(element = $(element))) return;
      var elementClassName = element.className;
      return (elementClassName.length > 0 && (elementClassName == className ||
        new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
    },
  
    addClassName: function(element, className) {
      if (!(element = $(element))) return;
      if (!element.hasClassName(className))
        element.className += (element.className ? ' ' : '') + className;
      return element;
    },
  
    removeClassName: function(element, className) {
      if (!(element = $(element))) return;
      element.className = element.className.replace(
        new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
      return element;
    },
  
    toggleClassName: function(element, className) {
      if (!(element = $(element))) return;
      return element[element.hasClassName(className) ?
        'removeClassName' : 'addClassName'](className);
    },
  
    // removes whitespace-only text node children
    cleanWhitespace: function(element) {
      element = $(element);
      var node = element.firstChild;
      while (node) {
        var nextNode = node.nextSibling;
        if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
          element.removeChild(node);
        node = nextNode;
      }
      return element;
    },
  
    empty: function(element) {
      return $(element).innerHTML.blank();
    },
  
    descendantOf: function(element, ancestor) {
      element = $(element), ancestor = $(ancestor);
      var originalAncestor = ancestor;
  
      if (element.compareDocumentPosition)
        return (element.compareDocumentPosition(ancestor) & 8) === 8;
  
      if (element.sourceIndex && !Prototype.Browser.Opera) {
        var e = element.sourceIndex, a = ancestor.sourceIndex,
         nextAncestor = ancestor.nextSibling;
        if (!nextAncestor) {
          do { ancestor = ancestor.parentNode; }
          while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
        }
        if (nextAncestor) return (e > a && e < nextAncestor.sourceIndex);
      }
  
      while (element = element.parentNode)
        if (element == originalAncestor) return true;
      return false;
    },
  
    scrollTo: function(element) {
      element = $(element);
      var pos = element.cumulativeOffset();
      window.scrollTo(pos[0], pos[1]);
      return element;
    },
  
    getStyle: function(element, style) {
      element = $(element);
      style = style == 'float' ? 'cssFloat' : style.camelize();
      var value = element.style[style];
      if (!value) {
        var css = document.defaultView.getComputedStyle(element, null);
        value = css ? css[style] : null;
      }
      if (style == 'opacity') return value ? parseFloat(value) : 1.0;
      return value == 'auto' ? null : value;
    },
  
    getOpacity: function(element) {
      return $(element).getStyle('opacity');
    },
  
    setStyle: function(element, styles) {
      element = $(element);
      var elementStyle = element.style, match;
      if (Object.isString(styles)) {
        element.style.cssText += ';' + styles;
        return styles.include('opacity') ?
          element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
      }
      for (var property in styles)
        if (property == 'opacity') element.setOpacity(styles[property]);
        else
          elementStyle[(property == 'float' || property == 'cssFloat') ?
            (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
              property] = styles[property];
  
      return element;
    },
  
    setOpacity: function(element, value) {
      element = $(element);
      element.style.opacity = (value == 1 || value === '') ? '' :
        (value < 0.00001) ? 0 : value;
      return element;
    },
  
    getDimensions: function(element) {
      element = $(element);
      var display = $(element).getStyle('display');
      if (display != 'none' && display != null) // Safari bug
        return {width: element.offsetWidth, height: element.offsetHeight};
  
      // All *Width and *Height properties give 0 on elements with display none,
      // so enable the element temporarily
      var els = element.style;
      var originalVisibility = els.visibility;
      var originalPosition = els.position;
      var originalDisplay = els.display;
      els.visibility = 'hidden';
      els.position = 'absolute';
      els.display = 'block';
      var originalWidth = element.clientWidth;
      var originalHeight = element.clientHeight;
      els.display = originalDisplay;
      els.position = originalPosition;
      els.visibility = originalVisibility;
      return {width: originalWidth, height: originalHeight};
    },
  
    makePositioned: function(element) {
      element = $(element);
      var pos = Element.getStyle(element, 'position');
      if (pos == 'static' || !pos) {
        element._madePositioned = true;
        element.style.position = 'relative';
        // Opera returns the offset relative to the positioning context, when an
        // element is position relative but top and left have not been defined
        if (window.opera) {
          element.style.top = 0;
          element.style.left = 0;
        }
      }
      return element;
    },
  
    undoPositioned: function(element) {
      element = $(element);
      if (element._madePositioned) {
        element._madePositioned = undefined;
        element.style.position =
          element.style.top =
          element.style.left =
          element.style.bottom =
          element.style.right = '';
      }
      return element;
    },
  
    makeClipping: function(element) {
      element = $(element);
      if (element._overflow) return element;
      element._overflow = Element.getStyle(element, 'overflow') || 'auto';
      if (element._overflow !== 'hidden')
        element.style.overflow = 'hidden';
      return element;
    },
  
    undoClipping: function(element) {
      element = $(element);
      if (!element._overflow) return element;
      element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
      element._overflow = null;
      return element;
    },
  
    cumulativeOffset: function(element) {
      var valueT = 0, valueL = 0;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        element = element.offsetParent;
      } while (element);
      return Element._returnOffset(valueL, valueT);
    },
  
    positionedOffset: function(element) {
      var valueT = 0, valueL = 0;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        element = element.offsetParent;
        if (element) {
          if (element.tagName == 'BODY') break;
          var p = Element.getStyle(element, 'position');
          if (p == 'relative' || p == 'absolute') break;
        }
      } while (element);
      return Element._returnOffset(valueL, valueT);
    },
  
    absolutize: function(element) {
      element = $(element);
      if (element.getStyle('position') == 'absolute') return;
      // Position.prepare(); // To be done manually by Scripty when it needs it.
  
      var offsets = element.positionedOffset();
      var top     = offsets[1];
      var left    = offsets[0];
      var width   = element.clientWidth;
      var height  = element.clientHeight;
  
      element._originalLeft   = left - parseFloat(element.style.left  || 0);
      element._originalTop    = top  - parseFloat(element.style.top || 0);
      element._originalWidth  = element.style.width;
      element._originalHeight = element.style.height;
  
      element.style.position = 'absolute';
      element.style.top    = top + 'px';
      element.style.left   = left + 'px';
      element.style.width  = width + 'px';
      element.style.height = height + 'px';
      return element;
    },
  
    relativize: function(element) {
      element = $(element);
      if (element.getStyle('position') == 'relative') return;
      // Position.prepare(); // To be done manually by Scripty when it needs it.
  
      element.style.position = 'relative';
      var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
      var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
  
      element.style.top    = top + 'px';
      element.style.left   = left + 'px';
      element.style.height = element._originalHeight;
      element.style.width  = element._originalWidth;
      return element;
    },
  
    cumulativeScrollOffset: function(element) {
      var valueT = 0, valueL = 0;
      do {
        valueT += element.scrollTop  || 0;
        valueL += element.scrollLeft || 0;
        element = element.parentNode;
      } while (element);
      return Element._returnOffset(valueL, valueT);
    },
  
    getOffsetParent: function(element) {
      if (element.offsetParent) return $(element.offsetParent);
      if (element == document.body) return $(element);
  
      while ((element = element.parentNode) && element != document.body)
        if (Element.getStyle(element, 'position') != 'static')
          return $(element);
  
      return $(document.body);
    },
  
    viewportOffset: function(forElement) {
      var valueT = 0, valueL = 0;
  
      var element = forElement;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
  
        // Safari fix
        if (element.offsetParent == document.body &&
          Element.getStyle(element, 'position') == 'absolute') break;
  
      } while (element = element.offsetParent);
  
      element = forElement;
      do {
        if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
          valueT -= element.scrollTop  || 0;
          valueL -= element.scrollLeft || 0;
        }
      } while (element = element.parentNode);
  
      return Element._returnOffset(valueL, valueT);
    },
  
    clonePosition: function(element, source) {
      var options = Object.extend({
        setLeft:    true,
        setTop:     true,
        setWidth:   true,
        setHeight:  true,
        offsetTop:  0,
        offsetLeft: 0
      }, arguments[2] || { });
  
      // find page position of source
      source = $(source);
      var p = source.viewportOffset();
  
      // find coordinate system to use
      element = $(element);
      var delta = [0, 0];
      var parent = null;
      // delta [0,0] will do fine with position: fixed elements,
      // position:absolute needs offsetParent deltas
      if (Element.getStyle(element, 'position') == 'absolute') {
        parent = element.getOffsetParent();
        delta = parent.viewportOffset();
      }
  
      // correct by body offsets (fixes Safari)
      if (parent == document.body) {
        delta[0] -= document.body.offsetLeft;
        delta[1] -= document.body.offsetTop;
      }
  
      // set position
      if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
      if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
      if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
      if (options.setHeight) element.style.height = source.offsetHeight + 'px';
      return element;
    }
  };
  
  Element.Methods.identify.counter = 1;
  
  Object.extend(Element.Methods, {
    getElementsBySelector: Element.Methods.select,
    childElements: Element.Methods.immediateDescendants
  });
  
  Element._attributeTranslations = {
    write: {
      names: {
        className: 'class',
        htmlFor:   'for'
      },
      values: { }
    }
  };
  
  
  if (!document.createRange || Prototype.Browser.Opera) {
    Element.Methods.insert = function(element, insertions) {
      element = $(element);
  
      if (Object.isString(insertions) || Object.isNumber(insertions) ||
          Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
            insertions = { bottom: insertions };
  
      var t = Element._insertionTranslations, content, position, pos, tagName;
  
      for (position in insertions) {
        content  = insertions[position];
        position = position.toLowerCase();
        pos      = t[position];
  
        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) {
          pos.insert(element, content);
          continue;
        }
  
        content = Object.toHTML(content);
        tagName = ((position == 'before' || position == 'after')
          ? element.parentNode : element).tagName.toUpperCase();
  
        if (t.tags[tagName]) {
          var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
          if (position == 'top' || position == 'after') fragments.reverse();
          fragments.each(pos.insert.curry(element));
        }
        else element.insertAdjacentHTML(pos.adjacency, content.stripScripts());
  
        content.evalScripts.bind(content).defer();
      }
  
      return element;
    };
  }
  
  if (Prototype.Browser.Opera) {
    Element.Methods.getStyle = Element.Methods.getStyle.wrap(
      function(proceed, element, style) {
        switch (style) {
          case 'left': case 'top': case 'right': case 'bottom':
            if (proceed(element, 'position') === 'static') return null;
          case 'height': case 'width':
            // returns '0px' for hidden elements; we want it to return null
            if (!Element.visible(element)) return null;
  
            // returns the border-box dimensions rather than the content-box
            // dimensions, so we subtract padding and borders from the value
            var dim = parseInt(proceed(element, style), 10);
  
            if (dim !== element['offset' + style.capitalize()])
              return dim + 'px';
  
            var properties;
            if (style === 'height') {
              properties = ['border-top-width', 'padding-top',
               'padding-bottom', 'border-bottom-width'];
            }
            else {
              properties = ['border-left-width', 'padding-left',
               'padding-right', 'border-right-width'];
            }
            return properties.inject(dim, function(memo, property) {
              var val = proceed(element, property);
              return val === null ? memo : memo - parseInt(val, 10);
            }) + 'px';
          default: return proceed(element, style);
        }
      }
    );
  
    Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
      function(proceed, element, attribute) {
        if (attribute === 'title') return element.title;
        return proceed(element, attribute);
      }
    );
  }
  
  else if (Prototype.Browser.IE) {
    $w('positionedOffset getOffsetParent viewportOffset').each(function(method) {
      Element.Methods[method] = Element.Methods[method].wrap(
        function(proceed, element) {
          element = $(element);
          var position = element.getStyle('position');
          if (position != 'static') return proceed(element);
          element.setStyle({ position: 'relative' });
          var value = proceed(element);
          element.setStyle({ position: position });
          return value;
        }
      );
    });
  
    Element.Methods.getStyle = function(element, style) {
      element = $(element);
      style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
      var value = element.style[style];
      if (!value && element.currentStyle) value = element.currentStyle[style];
  
      if (style == 'opacity') {
        if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
          if (value[1]) return parseFloat(value[1]) / 100;
        return 1.0;
      }
  
      if (value == 'auto') {
        if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
          return element['offset' + style.capitalize()] + 'px';
        return null;
      }
      return value;
    };
  
    Element.Methods.setOpacity = function(element, value) {
      function stripAlpha(filter){
        return filter.replace(/alpha\([^\)]*\)/gi,'');
      }
      element = $(element);
      var currentStyle = element.currentStyle;
      if ((currentStyle && !currentStyle.hasLayout) ||
        (!currentStyle && element.style.zoom == 'normal'))
          element.style.zoom = 1;
  
      var filter = element.getStyle('filter'), style = element.style;
      if (value == 1 || value === '') {
        (filter = stripAlpha(filter)) ?
          style.filter = filter : style.removeAttribute('filter');
        return element;
      } else if (value < 0.00001) value = 0;
      style.filter = stripAlpha(filter) +
        'alpha(opacity=' + (value * 100) + ')';
      return element;
    };
  
    Element._attributeTranslations = {
      read: {
        names: {
          'class': 'className',
          'for':   'htmlFor'
        },
        values: {
          _getAttr: function(element, attribute) {
            return element.getAttribute(attribute, 2);
          },
          _getAttrNode: function(element, attribute) {
            var node = element.getAttributeNode(attribute);
            return node ? node.value : "";
          },
          _getEv: function(element, attribute) {
            attribute = element.getAttribute(attribute);
            return attribute ? attribute.toString().slice(23, -2) : null;
          },
          _flag: function(element, attribute) {
            return $(element).hasAttribute(attribute) ? attribute : null;
          },
          style: function(element) {
            return element.style.cssText.toLowerCase();
          },
          title: function(element) {
            return element.title;
          }
        }
      }
    };
  
    Element._attributeTranslations.write = {
      names: Object.clone(Element._attributeTranslations.read.names),
      values: {
        checked: function(element, value) {
          element.checked = !!value;
        },
  
        style: function(element, value) {
          element.style.cssText = value ? value : '';
        }
      }
    };
  
    Element._attributeTranslations.has = {};
  
    $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
        'encType maxLength readOnly longDesc').each(function(attr) {
      Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
      Element._attributeTranslations.has[attr.toLowerCase()] = attr;
    });
  
    (function(v) {
      Object.extend(v, {
        href:        v._getAttr,
        src:         v._getAttr,
        type:        v._getAttr,
        action:      v._getAttrNode,
        disabled:    v._flag,
        checked:     v._flag,
        readonly:    v._flag,
        multiple:    v._flag,
        onload:      v._getEv,
        onunload:    v._getEv,
        onclick:     v._getEv,
        ondblclick:  v._getEv,
        onmousedown: v._getEv,
        onmouseup:   v._getEv,
        onmouseover: v._getEv,
        onmousemove: v._getEv,
        onmouseout:  v._getEv,
        onfocus:     v._getEv,
        onblur:      v._getEv,
        onkeypress:  v._getEv,
        onkeydown:   v._getEv,
        onkeyup:     v._getEv,
        onsubmit:    v._getEv,
        onreset:     v._getEv,
        onselect:    v._getEv,
        onchange:    v._getEv
      });
    })(Element._attributeTranslations.read.values);
  }
  
  else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
    Element.Methods.setOpacity = function(element, value) {
      element = $(element);
      element.style.opacity = (value == 1) ? 0.999999 :
        (value === '') ? '' : (value < 0.00001) ? 0 : value;
      return element;
    };
  }
  
  else if (Prototype.Browser.WebKit) {
    Element.Methods.setOpacity = function(element, value) {
      element = $(element);
      element.style.opacity = (value == 1 || value === '') ? '' :
        (value < 0.00001) ? 0 : value;
  
      if (value == 1)
        if(element.tagName == 'IMG' && element.width) {
          element.width++; element.width--;
        } else try {
          var n = document.createTextNode(' ');
          element.appendChild(n);
          element.removeChild(n);
        } catch (e) { }
  
      return element;
    };
  
    // Safari returns margins on body which is incorrect if the child is absolutely
    // positioned.  For performance reasons, redefine Element#cumulativeOffset for
    // KHTML/WebKit only.
    Element.Methods.cumulativeOffset = function(element) {
      var valueT = 0, valueL = 0;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        if (element.offsetParent == document.body)
          if (Element.getStyle(element, 'position') == 'absolute') break;
  
        element = element.offsetParent;
      } while (element);
  
      return Element._returnOffset(valueL, valueT);
    };
  }
  
  if (Prototype.Browser.IE || Prototype.Browser.Opera) {
    // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
    Element.Methods.update = function(element, content) {
      element = $(element);
  
      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) return element.update().insert(content);
  
      content = Object.toHTML(content);
      var tagName = element.tagName.toUpperCase();
  
      if (tagName in Element._insertionTranslations.tags) {
        $A(element.childNodes).each(function(node) { element.removeChild(node) });
        Element._getContentFromAnonymousElement(tagName, content.stripScripts())
          .each(function(node) { element.appendChild(node) });
      }
      else element.innerHTML = content.stripScripts();
  
      content.evalScripts.bind(content).defer();
      return element;
    };
  }
  
  if (document.createElement('div').outerHTML) {
    Element.Methods.replace = function(element, content) {
      element = $(element);
  
      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) {
        element.parentNode.replaceChild(content, element);
        return element;
      }
  
      content = Object.toHTML(content);
      var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
  
      if (Element._insertionTranslations.tags[tagName]) {
        var nextSibling = element.next();
        var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
        parent.removeChild(element);
        if (nextSibling)
          fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
        else
          fragments.each(function(node) { parent.appendChild(node) });
      }
      else element.outerHTML = content.stripScripts();
  
      content.evalScripts.bind(content).defer();
      return element;
    };
  }
  
  Element._returnOffset = function(l, t) {
    var result = [l, t];
    result.left = l;
    result.top = t;
    return result;
  };
  
  Element._getContentFromAnonymousElement = function(tagName, html) {
    var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
    div.innerHTML = t[0] + html + t[1];
    t[2].times(function() { div = div.firstChild });
    return $A(div.childNodes);
  };
  
  Element._insertionTranslations = {
    before: {
      adjacency: 'beforeBegin',
      insert: function(element, node) {
        element.parentNode.insertBefore(node, element);
      },
      initializeRange: function(element, range) {
        range.setStartBefore(element);
      }
    },
    top: {
      adjacency: 'afterBegin',
      insert: function(element, node) {
        element.insertBefore(node, element.firstChild);
      },
      initializeRange: function(element, range) {
        range.selectNodeContents(element);
        range.collapse(true);
      }
    },
    bottom: {
      adjacency: 'beforeEnd',
      insert: function(element, node) {
        element.appendChild(node);
      }
    },
    after: {
      adjacency: 'afterEnd',
      insert: function(element, node) {
        element.parentNode.insertBefore(node, element.nextSibling);
      },
      initializeRange: function(element, range) {
        range.setStartAfter(element);
      }
    },
    tags: {
      TABLE:  ['<table>',                '</table>',                   1],
      TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
      TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
      TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
      SELECT: ['<select>',               '</select>',                  1]
    }
  };
  
  (function() {
    this.bottom.initializeRange = this.top.initializeRange;
    Object.extend(this.tags, {
      THEAD: this.tags.TBODY,
      TFOOT: this.tags.TBODY,
      TH:    this.tags.TD
    });
  }).call(Element._insertionTranslations);
  
  Element.Methods.Simulated = {
    hasAttribute: function(element, attribute) {
      attribute = Element._attributeTranslations.has[attribute] || attribute;
      var node = $(element).getAttributeNode(attribute);
      return node && node.specified;
    }
  };
  
  Element.Methods.ByTag = { };
  
  Object.extend(Element, Element.Methods);
  
  if (!Prototype.BrowserFeatures.ElementExtensions &&
      document.createElement('div').__proto__) {
    window.HTMLElement = { };
    window.HTMLElement.prototype = document.createElement('div').__proto__;
    Prototype.BrowserFeatures.ElementExtensions = true;
  }
  
  Element.extend = (function() {
    if (Prototype.BrowserFeatures.SpecificElementExtensions)
      return Prototype.K;
  
    var Methods = { }, ByTag = Element.Methods.ByTag;
  
    var extend = Object.extend(function(element) {
      if (!element || element._extendedByPrototype ||
          element.nodeType != 1 || element == window) return element;
  
      var methods = Object.clone(Methods),
        tagName = element.tagName, property, value;
  
      // extend methods for specific tags
      if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
  
      for (property in methods) {
        value = methods[property];
        if (Object.isFunction(value) && !(property in element))
          element[property] = value.methodize();
      }
  
      element._extendedByPrototype = Prototype.emptyFunction;
      return element;
  
    }, {
      refresh: function() {
        // extend methods for all tags (Safari doesn't need this)
        if (!Prototype.BrowserFeatures.ElementExtensions) {
          Object.extend(Methods, Element.Methods);
          Object.extend(Methods, Element.Methods.Simulated);
        }
      }
    });
  
    extend.refresh();
    return extend;
  })();
  
  Element.hasAttribute = function(element, attribute) {
    if (element.hasAttribute) return element.hasAttribute(attribute);
    return Element.Methods.Simulated.hasAttribute(element, attribute);
  };
  
  Element.addMethods = function(methods) {
    var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
  
    if (!methods) {
      Object.extend(Form, Form.Methods);
      Object.extend(Form.Element, Form.Element.Methods);
      Object.extend(Element.Methods.ByTag, {
        "FORM":     Object.clone(Form.Methods),
        "INPUT":    Object.clone(Form.Element.Methods),
        "SELECT":   Object.clone(Form.Element.Methods),
        "TEXTAREA": Object.clone(Form.Element.Methods)
      });
    }
  
    if (arguments.length == 2) {
      var tagName = methods;
      methods = arguments[1];
    }
  
    if (!tagName) Object.extend(Element.Methods, methods || { });
    else {
      if (Object.isArray(tagName)) tagName.each(extend);
      else extend(tagName);
    }
  
    function extend(tagName) {
      tagName = tagName.toUpperCase();
      if (!Element.Methods.ByTag[tagName])
        Element.Methods.ByTag[tagName] = { };
      Object.extend(Element.Methods.ByTag[tagName], methods);
    }
  
    function copy(methods, destination, onlyIfAbsent) {
      onlyIfAbsent = onlyIfAbsent || false;
      for (var property in methods) {
        var value = methods[property];
        if (!Object.isFunction(value)) continue;
        if (!onlyIfAbsent || !(property in destination))
          destination[property] = value.methodize();
      }
    }
  
    function findDOMClass(tagName) {
      var klass;
      var trans = {
        "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
        "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
        "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
        "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
        "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
        "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
        "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
        "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
        "FrameSet", "IFRAME": "IFrame"
      };
      if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
      if (window[klass]) return window[klass];
      klass = 'HTML' + tagName + 'Element';
      if (window[klass]) return window[klass];
      klass = 'HTML' + tagName.capitalize() + 'Element';
      if (window[klass]) return window[klass];
  
      window[klass] = { };
      window[klass].prototype = document.createElement(tagName).__proto__;
      return window[klass];
    }
  
    if (F.ElementExtensions) {
      copy(Element.Methods, HTMLElement.prototype);
      copy(Element.Methods.Simulated, HTMLElement.prototype, true);
    }
  
    if (F.SpecificElementExtensions) {
      for (var tag in Element.Methods.ByTag) {
        var klass = findDOMClass(tag);
        if (Object.isUndefined(klass)) continue;
        copy(T[tag], klass.prototype);
      }
    }
  
    Object.extend(Element, Element.Methods);
    delete Element.ByTag;
  
    if (Element.extend.refresh) Element.extend.refresh();
    Element.cache = { };
  };
  
  document.viewport = {
    getDimensions: function() {
      var dimensions = { };
      var B = Prototype.Browser;
      $w('width height').each(function(d) {
        var D = d.capitalize();
        dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
          (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
      });
      return dimensions;
    },
  
    getWidth: function() {
      return this.getDimensions().width;
    },
  
    getHeight: function() {
      return this.getDimensions().height;
    },
  
    getScrollOffsets: function() {
      return Element._returnOffset(
        window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
        window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
    }
  };
  /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
   * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
   * license.  Please see http://www.yui-ext.com/ for more information. */
  
  var Selector = Class.create({
    initialize: function(expression) {
      this.expression = expression.strip();
      this.compileMatcher();
    },
  
    shouldUseXPath: function() {
      if (!Prototype.BrowserFeatures.XPath) return false;
  
      var e = this.expression;
  
      // Safari 3 chokes on :*-of-type and :empty
      if (Prototype.Browser.WebKit &&
       (e.include("-of-type") || e.include(":empty")))
        return false;
  
      // XPath can't do namespaced attributes, nor can it read
      // the "checked" property from DOM nodes
      if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
        return false;
  
      return true;
    },
  
    compileMatcher: function() {
      if (this.shouldUseXPath())
        return this.compileXPathMatcher();
  
      var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
          c = Selector.criteria, le, p, m;
  
      if (Selector._cache[e]) {
        this.matcher = Selector._cache[e];
        return;
      }
  
      this.matcher = ["this.matcher = function(root) {",
                      "var r = root, h = Selector.handlers, c = false, n;"];
  
      while (e && le != e && (/\S/).test(e)) {
        le = e;
        for (var i in ps) {
          p = ps[i];
          if (m = e.match(p)) {
            this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
      	      new Template(c[i]).evaluate(m));
            e = e.replace(m[0], '');
            break;
          }
        }
      }
  
      this.matcher.push("return h.unique(n);\n}");
      eval(this.matcher.join('\n'));
      Selector._cache[this.expression] = this.matcher;
    },
  
    compileXPathMatcher: function() {
      var e = this.expression, ps = Selector.patterns,
          x = Selector.xpath, le, m;
  
      if (Selector._cache[e]) {
        this.xpath = Selector._cache[e]; return;
      }
  
      this.matcher = ['.//*'];
      while (e && le != e && (/\S/).test(e)) {
        le = e;
        for (var i in ps) {
          if (m = e.match(ps[i])) {
            this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
              new Template(x[i]).evaluate(m));
            e = e.replace(m[0], '');
            break;
          }
        }
      }
  
      this.xpath = this.matcher.join('');
      Selector._cache[this.expression] = this.xpath;
    },
  
    findElements: function(root) {
      root = root || document;
      if (this.xpath) return document._getElementsByXPath(this.xpath, root);
      return this.matcher(root);
    },
  
    match: function(element) {
      this.tokens = [];
  
      var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
      var le, p, m;
  
      while (e && le !== e && (/\S/).test(e)) {
        le = e;
        for (var i in ps) {
          p = ps[i];
          if (m = e.match(p)) {
            // use the Selector.assertions methods unless the selector
            // is too complex.
            if (as[i]) {
              this.tokens.push([i, Object.clone(m)]);
              e = e.replace(m[0], '');
            } else {
              // reluctantly do a document-wide search
              // and look for a match in the array
              return this.findElements(document).include(element);
            }
          }
        }
      }
  
      var match = true, name, matches;
      for (var i = 0, token; token = this.tokens[i]; i++) {
        name = token[0], matches = token[1];
        if (!Selector.assertions[name](element, matches)) {
          match = false; break;
        }
      }
  
      return match;
    },
  
    toString: function() {
      return this.expression;
    },
  
    inspect: function() {
      return "#<Selector:" + this.expression.inspect() + ">";
    }
  });
  
  Object.extend(Selector, {
    _cache: { },
  
    xpath: {
      descendant:   "//*",
      child:        "/*",
      adjacent:     "/following-sibling::*[1]",
      laterSibling: '/following-sibling::*',
      tagName:      function(m) {
        if (m[1] == '*') return '';
        return "[local-name()='" + m[1].toLowerCase() +
               "' or local-name()='" + m[1].toUpperCase() + "']";
      },
      className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
      id:           "[@id='#{1}']",
      attrPresence: function(m) {
        m[1] = m[1].toLowerCase();
        return new Template("[@#{1}]").evaluate(m);
      },
      attr: function(m) {
        m[1] = m[1].toLowerCase();
        m[3] = m[5] || m[6];
        return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
      },
      pseudo: function(m) {
        var h = Selector.xpath.pseudos[m[1]];
        if (!h) return '';
        if (Object.isFunction(h)) return h(m);
        return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
      },
      operators: {
        '=':  "[@#{1}='#{3}']",
        '!=': "[@#{1}!='#{3}']",
        '^=': "[starts-with(@#{1}, '#{3}')]",
        '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
        '*=': "[contains(@#{1}, '#{3}')]",
        '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
        '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
      },
      pseudos: {
        'first-child': '[not(preceding-sibling::*)]',
        'last-child':  '[not(following-sibling::*)]',
        'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
        'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
        'checked':     "[@checked]",
        'disabled':    "[@disabled]",
        'enabled':     "[not(@disabled)]",
        'not': function(m) {
          var e = m[6], p = Selector.patterns,
              x = Selector.xpath, le, v;
  
          var exclusion = [];
          while (e && le != e && (/\S/).test(e)) {
            le = e;
            for (var i in p) {
              if (m = e.match(p[i])) {
                v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
                exclusion.push("(" + v.substring(1, v.length - 1) + ")");
                e = e.replace(m[0], '');
                break;
              }
            }
          }
          return "[not(" + exclusion.join(" and ") + ")]";
        },
        'nth-child':      function(m) {
          return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
        },
        'nth-last-child': function(m) {
          return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
        },
        'nth-of-type':    function(m) {
          return Selector.xpath.pseudos.nth("position() ", m);
        },
        'nth-last-of-type': function(m) {
          return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
        },
        'first-of-type':  function(m) {
          m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
        },
        'last-of-type':   function(m) {
          m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
        },
        'only-of-type':   function(m) {
          var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
        },
        nth: function(fragment, m) {
          var mm, formula = m[6], predicate;
          if (formula == 'even') formula = '2n+0';
          if (formula == 'odd')  formula = '2n+1';
          if (mm = formula.match(/^(\d+)$/)) // digit only
            return '[' + fragment + "= " + mm[1] + ']';
          if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
            if (mm[1] == "-") mm[1] = -1;
            var a = mm[1] ? Number(mm[1]) : 1;
            var b = mm[2] ? Number(mm[2]) : 0;
            predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
            "((#{fragment} - #{b}) div #{a} >= 0)]";
            return new Template(predicate).evaluate({
              fragment: fragment, a: a, b: b });
          }
        }
      }
    },
  
    criteria: {
      tagName:      'n = h.tagName(n, r, "#{1}", c);   c = false;',
      className:    'n = h.className(n, r, "#{1}", c); c = false;',
      id:           'n = h.id(n, r, "#{1}", c);        c = false;',
      attrPresence: 'n = h.attrPresence(n, r, "#{1}"); c = false;',
      attr: function(m) {
        m[3] = (m[5] || m[6]);
        return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); c = false;').evaluate(m);
      },
      pseudo: function(m) {
        if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
        return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
      },
      descendant:   'c = "descendant";',
      child:        'c = "child";',
      adjacent:     'c = "adjacent";',
      laterSibling: 'c = "laterSibling";'
    },
  
    patterns: {
      // combinators must be listed first
      // (and descendant needs to be last combinator)
      laterSibling: /^\s*~\s*/,
      child:        /^\s*>\s*/,
      adjacent:     /^\s*\+\s*/,
      descendant:   /^\s/,
  
      // selectors follow
      tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
      id:           /^#([\w\-\*]+)(\b|$)/,
      className:    /^\.([\w\-\*]+)(\b|$)/,
      pseudo:       /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s)|(?=:))/,
      attrPresence: /^\[([\w]+)\]/,
      attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
    },
  
    // for Selector.match and Element#match
    assertions: {
      tagName: function(element, matches) {
        return matches[1].toUpperCase() == element.tagName.toUpperCase();
      },
  
      className: function(element, matches) {
        return Element.hasClassName(element, matches[1]);
      },
  
      id: function(element, matches) {
        return element.id === matches[1];
      },
  
      attrPresence: function(element, matches) {
        return Element.hasAttribute(element, matches[1]);
      },
  
      attr: function(element, matches) {
        var nodeValue = Element.readAttribute(element, matches[1]);
        return Selector.operators[matches[2]](nodeValue, matches[3]);
      }
    },
  
    handlers: {
      // UTILITY FUNCTIONS
      // joins two collections
      concat: function(a, b) {
        for (var i = 0, node; node = b[i]; i++)
          a.push(node);
        return a;
      },
  
      // marks an array of nodes for counting
      mark: function(nodes) {
        for (var i = 0, node; node = nodes[i]; i++)
          node._counted = true;
        return nodes;
      },
  
      unmark: function(nodes) {
        for (var i = 0, node; node = nodes[i]; i++)
          node._counted = undefined;
        return nodes;
      },
  
      // mark each child node with its position (for nth calls)
      // "ofType" flag indicates whether we're indexing for nth-of-type
      // rather than nth-child
      index: function(parentNode, reverse, ofType) {
        parentNode._counted = true;
        if (reverse) {
          for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
            var node = nodes[i];
            if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
          }
        } else {
          for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
            if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
        }
      },
  
      // filters out duplicates and extends all nodes
      unique: function(nodes) {
        if (nodes.length == 0) return nodes;
        var results = [], n;
        for (var i = 0, l = nodes.length; i < l; i++)
          if (!(n = nodes[i])._counted) {
            n._counted = true;
            results.push(Element.extend(n));
          }
        return Selector.handlers.unmark(results);
      },
  
      // COMBINATOR FUNCTIONS
      descendant: function(nodes) {
        var h = Selector.handlers;
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          h.concat(results, node.getElementsByTagName('*'));
        return results;
      },
  
      child: function(nodes) {
        var h = Selector.handlers;
        for (var i = 0, results = [], node; node = nodes[i]; i++) {
          for (var j = 0, child; child = node.childNodes[j]; j++)
            if (child.nodeType == 1 && child.tagName != '!') results.push(child);
        }
        return results;
      },
  
      adjacent: function(nodes) {
        for (var i = 0, results = [], node; node = nodes[i]; i++) {
          var next = this.nextElementSibling(node);
          if (next) results.push(next);
        }
        return results;
      },
  
      laterSibling: function(nodes) {
        var h = Selector.handlers;
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          h.concat(results, Element.nextSiblings(node));
        return results;
      },
  
      nextElementSibling: function(node) {
        while (node = node.nextSibling)
  	      if (node.nodeType == 1) return node;
        return null;
      },
  
      previousElementSibling: function(node) {
        while (node = node.previousSibling)
          if (node.nodeType == 1) return node;
        return null;
      },
  
      // TOKEN FUNCTIONS
      tagName: function(nodes, root, tagName, combinator) {
        tagName = tagName.toUpperCase();
        var results = [], h = Selector.handlers;
        if (nodes) {
          if (combinator) {
            // fastlane for ordinary descendant combinators
            if (combinator == "descendant") {
              for (var i = 0, node; node = nodes[i]; i++)
                h.concat(results, node.getElementsByTagName(tagName));
              return results;
            } else nodes = this[combinator](nodes);
            if (tagName == "*") return nodes;
          }
          for (var i = 0, node; node = nodes[i]; i++)
            if (node.tagName.toUpperCase() == tagName) results.push(node);
          return results;
        } else return root.getElementsByTagName(tagName);
      },
  
      id: function(nodes, root, id, combinator) {
        var targetNode = $(id), h = Selector.handlers;
        if (!targetNode) return [];
        if (!nodes && root == document) return [targetNode];
        if (nodes) {
          if (combinator) {
            if (combinator == 'child') {
              for (var i = 0, node; node = nodes[i]; i++)
                if (targetNode.parentNode == node) return [targetNode];
            } else if (combinator == 'descendant') {
              for (var i = 0, node; node = nodes[i]; i++)
                if (Element.descendantOf(targetNode, node)) return [targetNode];
            } else if (combinator == 'adjacent') {
              for (var i = 0, node; node = nodes[i]; i++)
                if (Selector.handlers.previousElementSibling(targetNode) == node)
                  return [targetNode];
            } else nodes = h[combinator](nodes);
          }
          for (var i = 0, node; node = nodes[i]; i++)
            if (node == targetNode) return [targetNode];
          return [];
        }
        return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
      },
  
      className: function(nodes, root, className, combinator) {
        if (nodes && combinator) nodes = this[combinator](nodes);
        return Selector.handlers.byClassName(nodes, root, className);
      },
  
      byClassName: function(nodes, root, className) {
        if (!nodes) nodes = Selector.handlers.descendant([root]);
        var needle = ' ' + className + ' ';
        for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
          nodeClassName = node.className;
          if (nodeClassName.length == 0) continue;
          if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
            results.push(node);
        }
        return results;
      },
  
      attrPresence: function(nodes, root, attr) {
        if (!nodes) nodes = root.getElementsByTagName("*");
        var results = [];
        for (var i = 0, node; node = nodes[i]; i++)
          if (Element.hasAttribute(node, attr)) results.push(node);
        return results;
      },
  
      attr: function(nodes, root, attr, value, operator) {
        if (!nodes) nodes = root.getElementsByTagName("*");
        var handler = Selector.operators[operator], results = [];
        for (var i = 0, node; node = nodes[i]; i++) {
          var nodeValue = Element.readAttribute(node, attr);
          if (nodeValue === null) continue;
          if (handler(nodeValue, value)) results.push(node);
        }
        return results;
      },
  
      pseudo: function(nodes, name, value, root, combinator) {
        if (nodes && combinator) nodes = this[combinator](nodes);
        if (!nodes) nodes = root.getElementsByTagName("*");
        return Selector.pseudos[name](nodes, value, root);
      }
    },
  
    pseudos: {
      'first-child': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++) {
          if (Selector.handlers.previousElementSibling(node)) continue;
            results.push(node);
        }
        return results;
      },
      'last-child': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++) {
          if (Selector.handlers.nextElementSibling(node)) continue;
            results.push(node);
        }
        return results;
      },
      'only-child': function(nodes, value, root) {
        var h = Selector.handlers;
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
            results.push(node);
        return results;
      },
      'nth-child':        function(nodes, formula, root) {
        return Selector.pseudos.nth(nodes, formula, root);
      },
      'nth-last-child':   function(nodes, formula, root) {
        return Selector.pseudos.nth(nodes, formula, root, true);
      },
      'nth-of-type':      function(nodes, formula, root) {
        return Selector.pseudos.nth(nodes, formula, root, false, true);
      },
      'nth-last-of-type': function(nodes, formula, root) {
        return Selector.pseudos.nth(nodes, formula, root, true, true);
      },
      'first-of-type':    function(nodes, formula, root) {
        return Selector.pseudos.nth(nodes, "1", root, false, true);
      },
      'last-of-type':     function(nodes, formula, root) {
        return Selector.pseudos.nth(nodes, "1", root, true, true);
      },
      'only-of-type':     function(nodes, formula, root) {
        var p = Selector.pseudos;
        return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
      },
  
      // handles the an+b logic
      getIndices: function(a, b, total) {
        if (a == 0) return b > 0 ? [b] : [];
        return $R(1, total).inject([], function(memo, i) {
          if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
          return memo;
        });
      },
  
      // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
      nth: function(nodes, formula, root, reverse, ofType) {
        if (nodes.length == 0) return [];
        if (formula == 'even') formula = '2n+0';
        if (formula == 'odd')  formula = '2n+1';
        var h = Selector.handlers, results = [], indexed = [], m;
        h.mark(nodes);
        for (var i = 0, node; node = nodes[i]; i++) {
          if (!node.parentNode._counted) {
            h.index(node.parentNode, reverse, ofType);
            indexed.push(node.parentNode);
          }
        }
        if (formula.match(/^\d+$/)) { // just a number
          formula = Number(formula);
          for (var i = 0, node; node = nodes[i]; i++)
            if (node.nodeIndex == formula) results.push(node);
        } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
          if (m[1] == "-") m[1] = -1;
          var a = m[1] ? Number(m[1]) : 1;
          var b = m[2] ? Number(m[2]) : 0;
          var indices = Selector.pseudos.getIndices(a, b, nodes.length);
          for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
            for (var j = 0; j < l; j++)
              if (node.nodeIndex == indices[j]) results.push(node);
          }
        }
        h.unmark(nodes);
        h.unmark(indexed);
        return results;
      },
  
      'empty': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++) {
          // IE treats comments as element nodes
          if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
          results.push(node);
        }
        return results;
      },
  
      'not': function(nodes, selector, root) {
        var h = Selector.handlers, selectorType, m;
        var exclusions = new Selector(selector).findElements(root);
        h.mark(exclusions);
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (!node._counted) results.push(node);
        h.unmark(exclusions);
        return results;
      },
  
      'enabled': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (!node.disabled) results.push(node);
        return results;
      },
  
      'disabled': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (node.disabled) results.push(node);
        return results;
      },
  
      'checked': function(nodes, value, root) {
        for (var i = 0, results = [], node; node = nodes[i]; i++)
          if (node.checked) results.push(node);
        return results;
      }
    },
  
    operators: {
      '=':  function(nv, v) { return nv == v; },
      '!=': function(nv, v) { return nv != v; },
      '^=': function(nv, v) { return nv.startsWith(v); },
      '$=': function(nv, v) { return nv.endsWith(v); },
      '*=': function(nv, v) { return nv.include(v); },
      '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
      '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
    },
  
    matchElements: function(elements, expression) {
      var matches = new Selector(expression).findElements(), h = Selector.handlers;
      h.mark(matches);
      for (var i = 0, results = [], element; element = elements[i]; i++)
        if (element._counted) results.push(element);
      h.unmark(matches);
      return results;
    },
  
    findElement: function(elements, expression, index) {
      if (Object.isNumber(expression)) {
        index = expression; expression = false;
      }
      return Selector.matchElements(elements, expression || '*')[index || 0];
    },
  
    findChildElements: function(element, expressions) {
      var exprs = expressions.join(',');
      expressions = [];
      exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
        expressions.push(m[1].strip());
      });
      var results = [], h = Selector.handlers;
      for (var i = 0, l = expressions.length, selector; i < l; i++) {
        selector = new Selector(expressions[i].strip());
        h.concat(results, selector.findElements(element));
      }
      return (l > 1) ? h.unique(results) : results;
    }
  });
  
  if (Prototype.Browser.IE) {
    // IE returns comment nodes on getElementsByTagName("*").
    // Filter them out.
    Selector.handlers.concat = function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        if (node.tagName !== "!") a.push(node);
      return a;
    };
  }
  
  function $$() {
    return Selector.findChildElements(document, $A(arguments));
  }
  var Form = {
    reset: function(form) {
      $(form).reset();
      return form;
    },
  
    serializeElements: function(elements, options) {
      if (typeof options != 'object') options = { hash: !!options };
      else if (Object.isUndefined(options.hash)) options.hash = true;
      var key, value, submitted = false, submit = options.submit;
  
      var data = elements.inject({ }, function(result, element) {
        if (!element.disabled && element.name) {
          key = element.name; value = $(element).getValue();
          if (value != null && (element.type != 'submit' || (!submitted &&
              submit !== false && (!submit || key == submit) && (submitted = true)))) {
            if (key in result) {
              // a key is already present; construct an array of values
              if (!Object.isArray(result[key])) result[key] = [result[key]];
              result[key].push(value);
            }
            else result[key] = value;
          }
        }
        return result;
      });
  
      return options.hash ? data : Object.toQueryString(data);
    }
  };
  
  Form.Methods = {
    serialize: function(form, options) {
      return Form.serializeElements(Form.getElements(form), options);
    },
  
    getElements: function(form) {
      return $A($(form).getElementsByTagName('*')).inject([],
        function(elements, child) {
          if (Form.Element.Serializers[child.tagName.toLowerCase()])
            elements.push(Element.extend(child));
          return elements;
        }
      );
    },
  
    getInputs: function(form, typeName, name) {
      form = $(form);
      var inputs = form.getElementsByTagName('input');
  
      if (!typeName && !name) return $A(inputs).map(Element.extend);
  
      for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
        var input = inputs[i];
        if ((typeName && input.type != typeName) || (name && input.name != name))
          continue;
        matchingInputs.push(Element.extend(input));
      }
  
      return matchingInputs;
    },
  
    disable: function(form) {
      form = $(form);
      Form.getElements(form).invoke('disable');
      return form;
    },
  
    enable: function(form) {
      form = $(form);
      Form.getElements(form).invoke('enable');
      return form;
    },
  
    findFirstElement: function(form) {
      var elements = $(form).getElements().findAll(function(element) {
        return 'hidden' != element.type && !element.disabled;
      });
      var firstByIndex = elements.findAll(function(element) {
        return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
      }).sortBy(function(element) { return element.tabIndex }).first();
  
      return firstByIndex ? firstByIndex : elements.find(function(element) {
        return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
      });
    },
  
    focusFirstElement: function(form) {
      form = $(form);
      form.findFirstElement().activate();
      return form;
    },
  
    request: function(form, options) {
      form = $(form), options = Object.clone(options || { });
  
      var params = options.parameters, action = form.readAttribute('action') || '';
      if (action.blank()) action = window.location.href;
      options.parameters = form.serialize(true);
  
      if (params) {
        if (Object.isString(params)) params = params.toQueryParams();
        Object.extend(options.parameters, params);
      }
  
      if (form.hasAttribute('method') && !options.method)
        options.method = form.method;
  
      return new Ajax.Request(action, options);
    }
  };
  
  /*--------------------------------------------------------------------------*/
  
  Form.Element = {
    focus: function(element) {
      $(element).focus();
      return element;
    },
  
    select: function(element) {
      $(element).select();
      return element;
    }
  };
  
  Form.Element.Methods = {
    serialize: function(element) {
      element = $(element);
      if (!element.disabled && element.name) {
        var value = element.getValue();
        if (value != undefined) {
          var pair = { };
          pair[element.name] = value;
          return Object.toQueryString(pair);
        }
      }
      return '';
    },
  
    getValue: function(element) {
      element = $(element);
      var method = element.tagName.toLowerCase();
      return Form.Element.Serializers[method](element);
    },
  
    setValue: function(element, value) {
      element = $(element);
      var method = element.tagName.toLowerCase();
      Form.Element.Serializers[method](element, value);
      return element;
    },
  
    clear: function(element) {
      $(element).value = '';
      return element;
    },
  
    present: function(element) {
      return $(element).value != '';
    },
  
    activate: function(element) {
      element = $(element);
      try {
        element.focus();
        if (element.select && (element.tagName.toLowerCase() != 'input' ||
            !['button', 'reset', 'submit'].include(element.type)))
          element.select();
      } catch (e) { }
      return element;
    },
  
    disable: function(element) {
      element = $(element);
      element.blur();
      element.disabled = true;
      return element;
    },
  
    enable: function(element) {
      element = $(element);
      element.disabled = false;
      return element;
    }
  };
  
  /*--------------------------------------------------------------------------*/
  
  var Field = Form.Element;
  var $F = Form.Element.Methods.getValue;
  
  /*--------------------------------------------------------------------------*/
  
  Form.Element.Serializers = {
    input: function(element, value) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          return Form.Element.Serializers.inputSelector(element, value);
        default:
          return Form.Element.Serializers.textarea(element, value);
      }
    },
  
    inputSelector: function(element, value) {
      if (Object.isUndefined(value)) return element.checked ? element.value : null;
      else element.checked = !!value;
    },
  
    textarea: function(element, value) {
      if (Object.isUndefined(value)) return element.value;
      else element.value = value;
    },
  
    select: function(element, index) {
      if (Object.isUndefined(index))
        return this[element.type == 'select-one' ?
          'selectOne' : 'selectMany'](element);
      else {
        var opt, value, single = !Object.isArray(index);
        for (var i = 0, length = element.length; i < length; i++) {
          opt = element.options[i];
          value = this.optionValue(opt);
          if (single) {
            if (value == index) {
              opt.selected = true;
              return;
            }
          }
          else opt.selected = index.include(value);
        }
      }
    },
  
    selectOne: function(element) {
      var index = element.selectedIndex;
      return index >= 0 ? this.optionValue(element.options[index]) : null;
    },
  
    selectMany: function(element) {
      var values, length = element.length;
      if (!length) return null;
  
      for (var i = 0, values = []; i < length; i++) {
        var opt = element.options[i];
        if (opt.selected) values.push(this.optionValue(opt));
      }
      return values;
    },
  
    optionValue: function(opt) {
      // extend element because hasAttribute may not be native
      return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
    }
  };
  
  /*--------------------------------------------------------------------------*/
  
  Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
    initialize: function($super, element, frequency, callback) {
      $super(callback, frequency);
      this.element   = $(element);
      this.lastValue = this.getValue();
    },
  
    execute: function() {
      var value = this.getValue();
      if (Object.isString(this.lastValue) && Object.isString(value) ?
          this.lastValue != value : String(this.lastValue) != String(value)) {
        this.callback(this.element, value);
        this.lastValue = value;
      }
    }
  });
  
  Form.Element.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function() {
      return Form.Element.getValue(this.element);
    }
  });
  
  Form.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function() {
      return Form.serialize(this.element);
    }
  });
  
  /*--------------------------------------------------------------------------*/
  
  Abstract.EventObserver = Class.create({
    initialize: function(element, callback) {
      this.element  = $(element);
      this.callback = callback;
  
      this.lastValue = this.getValue();
      if (this.element.tagName.toLowerCase() == 'form')
        this.registerFormCallbacks();
      else
        this.registerCallback(this.element);
    },
  
    onElementEvent: function() {
      var value = this.getValue();
      if (this.lastValue != value) {
        this.callback(this.element, value);
        this.lastValue = value;
      }
    },
  
    registerFormCallbacks: function() {
      Form.getElements(this.element).each(this.registerCallback, this);
    },
  
    registerCallback: function(element) {
      if (element.type) {
        switch (element.type.toLowerCase()) {
          case 'checkbox':
          case 'radio':
            Event.observe(element, 'click', this.onElementEvent.bind(this));
            break;
          default:
            Event.observe(element, 'change', this.onElementEvent.bind(this));
            break;
        }
      }
    }
  });
  
  Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function() {
      return Form.Element.getValue(this.element);
    }
  });
  
  Form.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function() {
      return Form.serialize(this.element);
    }
  });
  if (!window.Event) var Event = { };
  
  Object.extend(Event, {
    KEY_BACKSPACE: 8,
    KEY_TAB:       9,
    KEY_RETURN:   13,
    KEY_ESC:      27,
    KEY_LEFT:     37,
    KEY_UP:       38,
    KEY_RIGHT:    39,
    KEY_DOWN:     40,
    KEY_DELETE:   46,
    KEY_HOME:     36,
    KEY_END:      35,
    KEY_PAGEUP:   33,
    KEY_PAGEDOWN: 34,
    KEY_INSERT:   45,
  
    cache: { },
  
    relatedTarget: function(event) {
      var element;
      switch(event.type) {
        case 'mouseover': element = event.fromElement; break;
        case 'mouseout':  element = event.toElement;   break;
        default: return null;
      }
      return Element.extend(element);
    }
  });
  
  Event.Methods = (function() {
    var isButton;
  
    if (Prototype.Browser.IE) {
      var buttonMap = { 0: 1, 1: 4, 2: 2 };
      isButton = function(event, code) {
        return event.button == buttonMap[code];
      };
  
    } else if (Prototype.Browser.WebKit) {
      isButton = function(event, code) {
        switch (code) {
          case 0: return event.which == 1 && !event.metaKey;
          case 1: return event.which == 1 && event.metaKey;
          default: return false;
        }
      };
  
    } else {
      isButton = function(event, code) {
        return event.which ? (event.which === code + 1) : (event.button === code);
      };
    }
  
    return {
      isLeftClick:   function(event) { return isButton(event, 0) },
      isMiddleClick: function(event) { return isButton(event, 1) },
      isRightClick:  function(event) { return isButton(event, 2) },
  
      element: function(event) {
        var node = Event.extend(event).target;
        return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
      },
  
      findElement: function(event, expression) {
        var element = Event.element(event);
        if (!expression) return element;
        var elements = [element].concat(element.ancestors());
        return Selector.findElement(elements, expression, 0);
      },
  
      pointer: function(event) {
        return {
          x: event.pageX || (event.clientX +
            (document.documentElement.scrollLeft || document.body.scrollLeft)),
          y: event.pageY || (event.clientY +
            (document.documentElement.scrollTop || document.body.scrollTop))
        };
      },
  
      pointerX: function(event) { return Event.pointer(event).x },
      pointerY: function(event) { return Event.pointer(event).y },
  
      stop: function(event) {
        Event.extend(event);
        event.preventDefault();
        event.stopPropagation();
        event.stopped = true;
      }
    };
  })();
  
  Event.extend = (function() {
    var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
      m[name] = Event.Methods[name].methodize();
      return m;
    });
  
    if (Prototype.Browser.IE) {
      Object.extend(methods, {
        stopPropagation: function() { this.cancelBubble = true },
        preventDefault:  function() { this.returnValue = false },
        inspect: function() { return "[object Event]" }
      });
  
      return function(event) {
        if (!event) return false;
        if (event._extendedByPrototype) return event;
  
        event._extendedByPrototype = Prototype.emptyFunction;
        var pointer = Event.pointer(event);
        Object.extend(event, {
          target: event.srcElement,
          relatedTarget: Event.relatedTarget(event),
          pageX:  pointer.x,
          pageY:  pointer.y
        });
        return Object.extend(event, methods);
      };
  
    } else {
      Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
      Object.extend(Event.prototype, methods);
      return Prototype.K;
    }
  })();
  
  Object.extend(Event, (function() {
    var cache = Event.cache;
  
    function getEventID(element) {
      if (element._eventID) return element._eventID;
      arguments.callee.id = arguments.callee.id || 1;
      return element._eventID = ++arguments.callee.id;
    }
  
    function getDOMEventName(eventName) {
      if (eventName && eventName.include(':')) return "dataavailable";
      return eventName;
    }
  
    function getCacheForID(id) {
      return cache[id] = cache[id] || { };
    }
  
    function getWrappersForEventName(id, eventName) {
      var c = getCacheForID(id);
      return c[eventName] = c[eventName] || [];
    }
  
    function createWrapper(element, eventName, handler) {
      var id = getEventID(element);
      var c = getWrappersForEventName(id, eventName);
      if (c.pluck("handler").include(handler)) return false;
  
      var wrapper = function(event) {
        if (!Event || !Event.extend ||
          (event.eventName && event.eventName != eventName))
            return false;
  
        Event.extend(event);
        handler.call(element, event)
      };
  
      wrapper.handler = handler;
      c.push(wrapper);
      return wrapper;
    }
  
    function findWrapper(id, eventName, handler) {
      var c = getWrappersForEventName(id, eventName);
      return c.find(function(wrapper) { return wrapper.handler == handler });
    }
  
    function destroyWrapper(id, eventName, handler) {
      var c = getCacheForID(id);
      if (!c[eventName]) return false;
      c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
    }
  
    function destroyCache() {
      for (var id in cache)
        for (var eventName in cache[id])
          cache[id][eventName] = null;
    }
  
    if (window.attachEvent) {
      window.attachEvent("onunload", destroyCache);
    }
  
    return {
      observe: function(element, eventName, handler) {
        element = $(element);
        var name = getDOMEventName(eventName);
  
        var wrapper = createWrapper(element, eventName, handler);
        if (!wrapper) return element;
  
        if (element.addEventListener) {
          element.addEventListener(name, wrapper, false);
        } else {
          element.attachEvent("on" + name, wrapper);
        }
  
        return element;
      },
  
      stopObserving: function(element, eventName, handler) {
        element = $(element);
        var id = getEventID(element), name = getDOMEventName(eventName);
  
        if (!handler && eventName) {
          getWrappersForEventName(id, eventName).each(function(wrapper) {
            element.stopObserving(eventName, wrapper.handler);
          });
          return element;
  
        } else if (!eventName) {
          Object.keys(getCacheForID(id)).each(function(eventName) {
            element.stopObserving(eventName);
          });
          return element;
        }
  
        var wrapper = findWrapper(id, eventName, handler);
        if (!wrapper) return element;
  
        if (element.removeEventListener) {
          element.removeEventListener(name, wrapper, false);
        } else {
          element.detachEvent("on" + name, wrapper);
        }
  
        destroyWrapper(id, eventName, handler);
  
        return element;
      },
  
      fire: function(element, eventName, memo) {
        element = $(element);
        if (element == document && document.createEvent && !element.dispatchEvent)
          element = document.documentElement;
  
        if (document.createEvent) {
          var event = document.createEvent("HTMLEvents");
          event.initEvent("dataavailable", true, true);
        } else {
          var event = document.createEventObject();
          event.eventType = "ondataavailable";
        }
  
        event.eventName = eventName;
        event.memo = memo || { };
  
        if (document.createEvent) {
          element.dispatchEvent(event);
        } else {
          element.fireEvent(event.eventType, event);
        }
  
        return Event.extend(event);
      }
    };
  })());
  
  Object.extend(Event, Event.Methods);
  
  Element.addMethods({
    fire:          Event.fire,
    observe:       Event.observe,
    stopObserving: Event.stopObserving
  });
  
  Object.extend(document, {
    fire:          Element.Methods.fire.methodize(),
    observe:       Element.Methods.observe.methodize(),
    stopObserving: Element.Methods.stopObserving.methodize()
  });
  
  (function() {
    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
       Matthias Miller, Dean Edwards and John Resig. */
  
    var timer, fired = false;
  
    function fireContentLoadedEvent() {
      if (fired) return;
      if (timer) window.clearInterval(timer);
      document.fire("dom:loaded");
      fired = true;
    }
  
    if (document.addEventListener) {
      if (Prototype.Browser.WebKit) {
        timer = window.setInterval(function() {
          if (/loaded|complete/.test(document.readyState))
            fireContentLoadedEvent();
        }, 0);
  
        Event.observe(window, "load", fireContentLoadedEvent);
  
      } else {
        document.addEventListener("DOMContentLoaded",
          fireContentLoadedEvent, false);
      }
  
    } else {
      document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
      $("__onDOMContentLoaded").onreadystatechange = function() {
        if (this.readyState == "complete") {
          this.onreadystatechange = null;
          fireContentLoadedEvent();
        }
      };
    }
  })();
  /*------------------------------- DEPRECATED -------------------------------*/
  
  Hash.toQueryString = Object.toQueryString;
  
  var Toggle = { display: Element.toggle };
  
  Element.Methods.childOf = Element.Methods.descendantOf;
  
  var Insertion = {
    Before: function(element, content) {
      return Element.insert(element, {before:content});
    },
  
    Top: function(element, content) {
      return Element.insert(element, {top:content});
    },
  
    Bottom: function(element, content) {
      return Element.insert(element, {bottom:content});
    },
  
    After: function(element, content) {
      return Element.insert(element, {after:content});
    }
  };
  
  var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
  
  // This should be moved to script.aculo.us; notice the deprecated methods
  // further below, that map to the newer Element methods.
  var Position = {
    // set to true if needed, warning: firefox performance problems
    // NOT neeeded for page scrolling, only if draggable contained in
    // scrollable elements
    includeScrollOffsets: false,
  
    // must be called before calling withinIncludingScrolloffset, every time the
    // page is scrolled
    prepare: function() {
      this.deltaX =  window.pageXOffset
                  || document.documentElement.scrollLeft
                  || document.body.scrollLeft
                  || 0;
      this.deltaY =  window.pageYOffset
                  || document.documentElement.scrollTop
                  || document.body.scrollTop
                  || 0;
    },
  
    // caches x/y coordinate pair to use with overlap
    within: function(element, x, y) {
      if (this.includeScrollOffsets)
        return this.withinIncludingScrolloffsets(element, x, y);
      this.xcomp = x;
      this.ycomp = y;
      this.offset = Element.cumulativeOffset(element);
  
      return (y >= this.offset[1] &&
              y <  this.offset[1] + element.offsetHeight &&
              x >= this.offset[0] &&
              x <  this.offset[0] + element.offsetWidth);
    },
  
    withinIncludingScrolloffsets: function(element, x, y) {
      var offsetcache = Element.cumulativeScrollOffset(element);
  
      this.xcomp = x + offsetcache[0] - this.deltaX;
      this.ycomp = y + offsetcache[1] - this.deltaY;
      this.offset = Element.cumulativeOffset(element);
  
      return (this.ycomp >= this.offset[1] &&
              this.ycomp <  this.offset[1] + element.offsetHeight &&
              this.xcomp >= this.offset[0] &&
              this.xcomp <  this.offset[0] + element.offsetWidth);
    },
  
    // within must be called directly before
    overlap: function(mode, element) {
      if (!mode) return 0;
      if (mode == 'vertical')
        return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
          element.offsetHeight;
      if (mode == 'horizontal')
        return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
          element.offsetWidth;
    },
  
    // Deprecation layer -- use newer Element methods now (1.5.2).
  
    cumulativeOffset: Element.Methods.cumulativeOffset,
  
    positionedOffset: Element.Methods.positionedOffset,
  
    absolutize: function(element) {
      Position.prepare();
      return Element.absolutize(element);
    },
  
    relativize: function(element) {
      Position.prepare();
      return Element.relativize(element);
    },
  
    realOffset: Element.Methods.cumulativeScrollOffset,
  
    offsetParent: Element.Methods.getOffsetParent,
  
    page: Element.Methods.viewportOffset,
  
    clone: function(source, target, options) {
      options = options || { };
      return Element.clonePosition(target, source, options);
    }
  };
  
  /*--------------------------------------------------------------------------*/
  
  if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
    function iter(name) {
      return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
    }
  
    instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
    function(element, className) {
      className = className.toString().strip();
      var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
      return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
    } : function(element, className) {
      className = className.toString().strip();
      var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
      if (!classNames && !className) return elements;
  
      var nodes = $(element).getElementsByTagName('*');
      className = ' ' + className + ' ';
  
      for (var i = 0, child, cn; child = nodes[i]; i++) {
        if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
            (classNames && classNames.all(function(name) {
              return !name.toString().blank() && cn.include(' ' + name + ' ');
            }))))
          elements.push(Element.extend(child));
      }
      return elements;
    };
  
    return function(className, parentElement) {
      return $(parentElement || document.body).getElementsByClassName(className);
    };
  }(Element.Methods);
  
  /*--------------------------------------------------------------------------*/
  
  Element.ClassNames = Class.create();
  Element.ClassNames.prototype = {
    initialize: function(element) {
      this.element = $(element);
    },
  
    _each: function(iterator) {
      this.element.className.split(/\s+/).select(function(name) {
        return name.length > 0;
      })._each(iterator);
    },
  
    set: function(className) {
      this.element.className = className;
    },
  
    add: function(classNameToAdd) {
      if (this.include(classNameToAdd)) return;
      this.set($A(this).concat(classNameToAdd).join(' '));
    },
  
    remove: function(classNameToRemove) {
      if (!this.include(classNameToRemove)) return;
      this.set($A(this).without(classNameToRemove).join(' '));
    },
  
    toString: function() {
      return $A(this).join(' ');
    }
  };
  
  Object.extend(Element.ClassNames.prototype, Enumerable);
  
  /*--------------------------------------------------------------------------*/
  
  Element.addMethods();
  
  // Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
  // Contributors:
  //  Justin Palmer (http://encytemedia.com/)
  //  Mark Pilgrim (http://diveintomark.org/)
  //  Martin Bialasinki
  // 
  // script.aculo.us is freely distributable under the terms of an MIT-style license.
  // For details, see the script.aculo.us web site: http://script.aculo.us/ 
  
  // converts rgb() and #xxx to #xxxxxx format,  
  // returns self (or first argument) if not convertable  
  String.prototype.parseColor = function() {  
    var color = '#';
    if (this.slice(0,4) == 'rgb(') {  
      var cols = this.slice(4,this.length-1).split(',');  
      var i=0; do { color += parseInt(cols[i]).toColorPart() } while (++i<3);  
    } else {  
      if (this.slice(0,1) == '#') {  
        if (this.length==4) for(var i=1;i<4;i++) color += (this.charAt(i) + this.charAt(i)).toLowerCase();  
        if (this.length==7) color = this.toLowerCase();  
      }  
    }  
    return (color.length==7 ? color : (arguments[0] || this));  
  };
  
  /*--------------------------------------------------------------------------*/
  
  Element.collectTextNodes = function(element) {  
    return $A($(element).childNodes).collect( function(node) {
      return (node.nodeType==3 ? node.nodeValue : 
        (node.hasChildNodes() ? Element.collectTextNodes(node) : ''));
    }).flatten().join('');
  };
  
  Element.collectTextNodesIgnoreClass = function(element, className) {  
    return $A($(element).childNodes).collect( function(node) {
      return (node.nodeType==3 ? node.nodeValue : 
        ((node.hasChildNodes() && !Element.hasClassName(node,className)) ? 
          Element.collectTextNodesIgnoreClass(node, className) : ''));
    }).flatten().join('');
  };
  
  Element.setContentZoom = function(element, percent) {
    element = $(element);  
    element.setStyle({fontSize: (percent/100) + 'em'});   
    if (Prototype.Browser.WebKit) window.scrollBy(0,0);
    return element;
  };
  
  Element.getInlineOpacity = function(element){
    return $(element).style.opacity || '';
  };
  
  Element.forceRerendering = function(element) {
    try {
      element = $(element);
      var n = document.createTextNode(' ');
      element.appendChild(n);
      element.removeChild(n);
    } catch(e) { }
  };
  
  /*--------------------------------------------------------------------------*/
  
  var Effect = {
    _elementDoesNotExistError: {
      name: 'ElementDoesNotExistError',
      message: 'The specified DOM element does not exist, but is required for this effect to operate'
    },
    Transitions: {
      linear: Prototype.K,
      sinoidal: function(pos) {
        return (-Math.cos(pos*Math.PI)/2) + 0.5;
      },
      reverse: function(pos) {
        return 1-pos;
      },
      flicker: function(pos) {
        var pos = ((-Math.cos(pos*Math.PI)/4) + 0.75) + Math.random()/4;
        return pos > 1 ? 1 : pos;
      },
      wobble: function(pos) {
        return (-Math.cos(pos*Math.PI*(9*pos))/2) + 0.5;
      },
      pulse: function(pos, pulses) { 
        pulses = pulses || 5; 
        return (
          ((pos % (1/pulses)) * pulses).round() == 0 ? 
                ((pos * pulses * 2) - (pos * pulses * 2).floor()) : 
            1 - ((pos * pulses * 2) - (pos * pulses * 2).floor())
          );
      },
      spring: function(pos) { 
        return 1 - (Math.cos(pos * 4.5 * Math.PI) * Math.exp(-pos * 6)); 
      },
      none: function(pos) {
        return 0;
      },
      full: function(pos) {
        return 1;
      }
    },
    DefaultOptions: {
      duration:   1.0,   // seconds
      fps:        100,   // 100= assume 66fps max.
      sync:       false, // true for combining
      from:       0.0,
      to:         1.0,
      delay:      0.0,
      queue:      'parallel'
    },
    tagifyText: function(element) {
      var tagifyStyle = 'position:relative';
      if (Prototype.Browser.IE) tagifyStyle += ';zoom:1';
      
      element = $(element);
      $A(element.childNodes).each( function(child) {
        if (child.nodeType==3) {
          child.nodeValue.toArray().each( function(character) {
            element.insertBefore(
              new Element('span', {style: tagifyStyle}).update(
                character == ' ' ? String.fromCharCode(160) : character), 
                child);
          });
          Element.remove(child);
        }
      });
    },
    multiple: function(element, effect) {
      var elements;
      if (((typeof element == 'object') || 
          Object.isFunction(element)) && 
         (element.length))
        elements = element;
      else
        elements = $(element).childNodes;
        
      var options = Object.extend({
        speed: 0.1,
        delay: 0.0
      }, arguments[2] || { });
      var masterDelay = options.delay;
  
      $A(elements).each( function(element, index) {
        new effect(element, Object.extend(options, { delay: index * options.speed + masterDelay }));
      });
    },
    PAIRS: {
      'slide':  ['SlideDown','SlideUp'],
      'blind':  ['BlindDown','BlindUp'],
      'appear': ['Appear','Fade']
    },
    toggle: function(element, effect) {
      element = $(element);
      effect = (effect || 'appear').toLowerCase();
      var options = Object.extend({
        queue: { position:'end', scope:(element.id || 'global'), limit: 1 }
      }, arguments[2] || { });
      Effect[element.visible() ? 
        Effect.PAIRS[effect][1] : Effect.PAIRS[effect][0]](element, options);
    }
  };
  
  Effect.DefaultOptions.transition = Effect.Transitions.sinoidal;
  
  /* ------------- core effects ------------- */
  
  Effect.ScopedQueue = Class.create(Enumerable, {
    initialize: function() {
      this.effects  = [];
      this.interval = null;    
    },
    _each: function(iterator) {
      this.effects._each(iterator);
    },
    add: function(effect) {
      var timestamp = new Date().getTime();
      
      var position = Object.isString(effect.options.queue) ? 
        effect.options.queue : effect.options.queue.position;
      
      switch(position) {
        case 'front':
          // move unstarted effects after this effect  
          this.effects.findAll(function(e){ return e.state=='idle' }).each( function(e) {
              e.startOn  += effect.finishOn;
              e.finishOn += effect.finishOn;
            });
          break;
        case 'with-last':
          timestamp = this.effects.pluck('startOn').max() || timestamp;
          break;
        case 'end':
          // start effect after last queued effect has finished
          timestamp = this.effects.pluck('finishOn').max() || timestamp;
          break;
      }
      
      effect.startOn  += timestamp;
      effect.finishOn += timestamp;
  
      if (!effect.options.queue.limit || (this.effects.length < effect.options.queue.limit))
        this.effects.push(effect);
      
      if (!this.interval)
        this.interval = setInterval(this.loop.bind(this), 15);
    },
    remove: function(effect) {
      this.effects = this.effects.reject(function(e) { return e==effect });
      if (this.effects.length == 0) {
        clearInterval(this.interval);
        this.interval = null;
      }
    },
    loop: function() {
      var timePos = new Date().getTime();
      for(var i=0, len=this.effects.length;i<len;i++) 
        this.effects[i] && this.effects[i].loop(timePos);
    }
  });
  
  Effect.Queues = {
    instances: $H(),
    get: function(queueName) {
      if (!Object.isString(queueName)) return queueName;
      
      return this.instances.get(queueName) ||
        this.instances.set(queueName, new Effect.ScopedQueue());
    }
  };
  Effect.Queue = Effect.Queues.get('global');
  
  Effect.Base = Class.create({
    position: null,
    start: function(options) {
      function codeForEvent(options,eventName){
        return (
          (options[eventName+'Internal'] ? 'this.options.'+eventName+'Internal(this);' : '') +
          (options[eventName] ? 'this.options.'+eventName+'(this);' : '')
        );
      }
      if (options && options.transition === false) options.transition = Effect.Transitions.linear;
      this.options      = Object.extend(Object.extend({ },Effect.DefaultOptions), options || { });
      this.currentFrame = 0;
      this.state        = 'idle';
      this.startOn      = this.options.delay*1000;
      this.finishOn     = this.startOn+(this.options.duration*1000);
      this.fromToDelta  = this.options.to-this.options.from;
      this.totalTime    = this.finishOn-this.startOn;
      this.totalFrames  = this.options.fps*this.options.duration;
      
      eval('this.render = function(pos){ '+
        'if (this.state=="idle"){this.state="running";'+
        codeForEvent(this.options,'beforeSetup')+
        (this.setup ? 'this.setup();':'')+ 
        codeForEvent(this.options,'afterSetup')+
        '};if (this.state=="running"){'+
        'pos=this.options.transition(pos)*'+this.fromToDelta+'+'+this.options.from+';'+
        'this.position=pos;'+
        codeForEvent(this.options,'beforeUpdate')+
        (this.update ? 'this.update(pos);':'')+
        codeForEvent(this.options,'afterUpdate')+
        '}}');
      
      this.event('beforeStart');
      if (!this.options.sync)
        Effect.Queues.get(Object.isString(this.options.queue) ? 
          'global' : this.options.queue.scope).add(this);
    },
    loop: function(timePos) {
      if (timePos >= this.startOn) {
        if (timePos >= this.finishOn) {
          this.render(1.0);
          this.cancel();
          this.event('beforeFinish');
          if (this.finish) this.finish(); 
          this.event('afterFinish');
          return;  
        }
        var pos   = (timePos - this.startOn) / this.totalTime,
            frame = (pos * this.totalFrames).round();
        if (frame > this.currentFrame) {
          this.render(pos);
          this.currentFrame = frame;
        }
      }
    },
    cancel: function() {
      if (!this.options.sync)
        Effect.Queues.get(Object.isString(this.options.queue) ? 
          'global' : this.options.queue.scope).remove(this);
      this.state = 'finished';
    },
    event: function(eventName) {
      if (this.options[eventName + 'Internal']) this.options[eventName + 'Internal'](this);
      if (this.options[eventName]) this.options[eventName](this);
    },
    inspect: function() {
      var data = $H();
      for(property in this)
        if (!Object.isFunction(this[property])) data.set(property, this[property]);
      return '#<Effect:' + data.inspect() + ',options:' + $H(this.options).inspect() + '>';
    }
  });
  
  Effect.Parallel = Class.create(Effect.Base, {
    initialize: function(effects) {
      this.effects = effects || [];
      this.start(arguments[1]);
    },
    update: function(position) {
      this.effects.invoke('render', position);
    },
    finish: function(position) {
      this.effects.each( function(effect) {
        effect.render(1.0);
        effect.cancel();
        effect.event('beforeFinish');
        if (effect.finish) effect.finish(position);
        effect.event('afterFinish');
      });
    }
  });
  
  Effect.Tween = Class.create(Effect.Base, {
    initialize: function(object, from, to) {
      object = Object.isString(object) ? $(object) : object;
      var args = $A(arguments), method = args.last(), 
        options = args.length == 5 ? args[3] : null;
      this.method = Object.isFunction(method) ? method.bind(object) :
        Object.isFunction(object[method]) ? object[method].bind(object) : 
        function(value) { object[method] = value };
      this.start(Object.extend({ from: from, to: to }, options || { }));
    },
    update: function(position) {
      this.method(position);
    }
  });
  
  Effect.Event = Class.create(Effect.Base, {
    initialize: function() {
      this.start(Object.extend({ duration: 0 }, arguments[0] || { }));
    },
    update: Prototype.emptyFunction
  });
  
  Effect.Opacity = Class.create(Effect.Base, {
    initialize: function(element) {
      this.element = $(element);
      if (!this.element) throw(Effect._elementDoesNotExistError);
      // make this work on IE on elements without 'layout'
      if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
        this.element.setStyle({zoom: 1});
      var options = Object.extend({
        from: this.element.getOpacity() || 0.0,
        to:   1.0
      }, arguments[1] || { });
      this.start(options);
    },
    update: function(position) {
      this.element.setOpacity(position);
    }
  });
  
  Effect.Move = Class.create(Effect.Base, {
    initialize: function(element) {
      this.element = $(element);
      if (!this.element) throw(Effect._elementDoesNotExistError);
      var options = Object.extend({
        x:    0,
        y:    0,
        mode: 'relative'
      }, arguments[1] || { });
      this.start(options);
    },
    setup: function() {
      this.element.makePositioned();
      this.originalLeft = parseFloat(this.element.getStyle('left') || '0');
      this.originalTop  = parseFloat(this.element.getStyle('top')  || '0');
      if (this.options.mode == 'absolute') {
        this.options.x = this.options.x - this.originalLeft;
        this.options.y = this.options.y - this.originalTop;
      }
    },
    update: function(position) {
      this.element.setStyle({
        left: (this.options.x  * position + this.originalLeft).round() + 'px',
        top:  (this.options.y  * position + this.originalTop).round()  + 'px'
      });
    }
  });
  
  // for backwards compatibility
  Effect.MoveBy = function(element, toTop, toLeft) {
    return new Effect.Move(element, 
      Object.extend({ x: toLeft, y: toTop }, arguments[3] || { }));
  };
  
  Effect.Scale = Class.create(Effect.Base, {
    initialize: function(element, percent) {
      this.element = $(element);
      if (!this.element) throw(Effect._elementDoesNotExistError);
      var options = Object.extend({
        scaleX: true,
        scaleY: true,
        scaleContent: true,
        scaleFromCenter: false,
        scaleMode: 'box',        // 'box' or 'contents' or { } with provided values
        scaleFrom: 100.0,
        scaleTo:   percent
      }, arguments[2] || { });
      this.start(options);
    },
    setup: function() {
      this.restoreAfterFinish = this.options.restoreAfterFinish || false;
      this.elementPositioning = this.element.getStyle('position');
      
      this.originalStyle = { };
      ['top','left','width','height','fontSize'].each( function(k) {
        this.originalStyle[k] = this.element.style[k];
      }.bind(this));
        
      this.originalTop  = this.element.offsetTop;
      this.originalLeft = this.element.offsetLeft;
      
      var fontSize = this.element.getStyle('font-size') || '100%';
      ['em','px','%','pt'].each( function(fontSizeType) {
        if (fontSize.indexOf(fontSizeType)>0) {
          this.fontSize     = parseFloat(fontSize);
          this.fontSizeType = fontSizeType;
        }
      }.bind(this));
      
      this.factor = (this.options.scaleTo - this.options.scaleFrom)/100;
      
      this.dims = null;
      if (this.options.scaleMode=='box')
        this.dims = [this.element.offsetHeight, this.element.offsetWidth];
      if (/^content/.test(this.options.scaleMode))
        this.dims = [this.element.scrollHeight, this.element.scrollWidth];
      if (!this.dims)
        this.dims = [this.options.scaleMode.originalHeight,
                     this.options.scaleMode.originalWidth];
    },
    update: function(position) {
      var currentScale = (this.options.scaleFrom/100.0) + (this.factor * position);
      if (this.options.scaleContent && this.fontSize)
        this.element.setStyle({fontSize: this.fontSize * currentScale + this.fontSizeType });
      this.setDimensions(this.dims[0] * currentScale, this.dims[1] * currentScale);
    },
    finish: function(position) {
      if (this.restoreAfterFinish) this.element.setStyle(this.originalStyle);
    },
    setDimensions: function(height, width) {
      var d = { };
      if (this.options.scaleX) d.width = width.round() + 'px';
      if (this.options.scaleY) d.height = height.round() + 'px';
      if (this.options.scaleFromCenter) {
        var topd  = (height - this.dims[0])/2;
        var leftd = (width  - this.dims[1])/2;
        if (this.elementPositioning == 'absolute') {
          if (this.options.scaleY) d.top = this.originalTop-topd + 'px';
          if (this.options.scaleX) d.left = this.originalLeft-leftd + 'px';
        } else {
          if (this.options.scaleY) d.top = -topd + 'px';
          if (this.options.scaleX) d.left = -leftd + 'px';
        }
      }
      this.element.setStyle(d);
    }
  });
  
  Effect.Highlight = Class.create(Effect.Base, {
    initialize: function(element) {
      this.element = $(element);
      if (!this.element) throw(Effect._elementDoesNotExistError);
      var options = Object.extend({ startcolor: '#ffff99' }, arguments[1] || { });
      this.start(options);
    },
    setup: function() {
      // Prevent executing on elements not in the layout flow
      if (this.element.getStyle('display')=='none') { this.cancel(); return; }
      // Disable background image during the effect
      this.oldStyle = { };
      if (!this.options.keepBackgroundImage) {
        this.oldStyle.backgroundImage = this.element.getStyle('background-image');
        this.element.setStyle({backgroundImage: 'none'});
      }
      if (!this.options.endcolor)
        this.options.endcolor = this.element.getStyle('background-color').parseColor('#ffffff');
      if (!this.options.restorecolor)
        this.options.restorecolor = this.element.getStyle('background-color');
      // init color calculations
      this._base  = $R(0,2).map(function(i){ return parseInt(this.options.startcolor.slice(i*2+1,i*2+3),16) }.bind(this));
      this._delta = $R(0,2).map(function(i){ return parseInt(this.options.endcolor.slice(i*2+1,i*2+3),16)-this._base[i] }.bind(this));
    },
    update: function(position) {
      this.element.setStyle({backgroundColor: $R(0,2).inject('#',function(m,v,i){
        return m+((this._base[i]+(this._delta[i]*position)).round().toColorPart()); }.bind(this)) });
    },
    finish: function() {
      this.element.setStyle(Object.extend(this.oldStyle, {
        backgroundColor: this.options.restorecolor
      }));
    }
  });
  
  Effect.ScrollTo = function(element) {
    var options = arguments[1] || { },
      scrollOffsets = document.viewport.getScrollOffsets(),
      elementOffsets = $(element).cumulativeOffset(),
      max = (window.height || document.body.scrollHeight) - document.viewport.getHeight();  
  
    if (options.offset) elementOffsets[1] += options.offset;
  
    return new Effect.Tween(null,
      scrollOffsets.top,
      elementOffsets[1] > max ? max : elementOffsets[1],
      options,
      function(p){ scrollTo(scrollOffsets.left, p.round()) }
    );
  };
  
  /* ------------- combination effects ------------- */
  
  Effect.Fade = function(element) {
    element = $(element);
    var oldOpacity = element.getInlineOpacity();
    var options = Object.extend({
      from: element.getOpacity() || 1.0,
      to:   0.0,
      afterFinishInternal: function(effect) { 
        if (effect.options.to!=0) return;
        effect.element.hide().setStyle({opacity: oldOpacity}); 
      }
    }, arguments[1] || { });
    return new Effect.Opacity(element,options);
  };
  
  Effect.Appear = function(element) {
    element = $(element);
    var options = Object.extend({
    from: (element.getStyle('display') == 'none' ? 0.0 : element.getOpacity() || 0.0),
    to:   1.0,
    // force Safari to render floated elements properly
    afterFinishInternal: function(effect) {
      effect.element.forceRerendering();
    },
    beforeSetup: function(effect) {
      effect.element.setOpacity(effect.options.from).show(); 
    }}, arguments[1] || { });
    return new Effect.Opacity(element,options);
  };
  
  Effect.Puff = function(element) {
    element = $(element);
    var oldStyle = { 
      opacity: element.getInlineOpacity(), 
      position: element.getStyle('position'),
      top:  element.style.top,
      left: element.style.left,
      width: element.style.width,
      height: element.style.height
    };
    return new Effect.Parallel(
     [ new Effect.Scale(element, 200, 
        { sync: true, scaleFromCenter: true, scaleContent: true, restoreAfterFinish: true }), 
       new Effect.Opacity(element, { sync: true, to: 0.0 } ) ], 
       Object.extend({ duration: 1.0, 
        beforeSetupInternal: function(effect) {
          Position.absolutize(effect.effects[0].element)
        },
        afterFinishInternal: function(effect) {
           effect.effects[0].element.hide().setStyle(oldStyle); }
       }, arguments[1] || { })
     );
  };
  
  Effect.BlindUp = function(element) {
    element = $(element);
    element.makeClipping();
    return new Effect.Scale(element, 0,
      Object.extend({ scaleContent: false, 
        scaleX: false, 
        restoreAfterFinish: true,
        afterFinishInternal: function(effect) {
          effect.element.hide().undoClipping();
        } 
      }, arguments[1] || { })
    );
  };
  
  Effect.BlindDown = function(element) {
    element = $(element);
    var elementDimensions = element.getDimensions();
    return new Effect.Scale(element, 100, Object.extend({ 
      scaleContent: false, 
      scaleX: false,
      scaleFrom: 0,
      scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
      restoreAfterFinish: true,
      afterSetup: function(effect) {
        effect.element.makeClipping().setStyle({height: '0px'}).show(); 
      },  
      afterFinishInternal: function(effect) {
        effect.element.undoClipping();
      }
    }, arguments[1] || { }));
  };
  
  Effect.SwitchOff = function(element) {
    element = $(element);
    var oldOpacity = element.getInlineOpacity();
    return new Effect.Appear(element, Object.extend({
      duration: 0.4,
      from: 0,
      transition: Effect.Transitions.flicker,
      afterFinishInternal: function(effect) {
        new Effect.Scale(effect.element, 1, { 
          duration: 0.3, scaleFromCenter: true,
          scaleX: false, scaleContent: false, restoreAfterFinish: true,
          beforeSetup: function(effect) { 
            effect.element.makePositioned().makeClipping();
          },
          afterFinishInternal: function(effect) {
            effect.element.hide().undoClipping().undoPositioned().setStyle({opacity: oldOpacity});
          }
        })
      }
    }, arguments[1] || { }));
  };
  
  Effect.DropOut = function(element) {
    element = $(element);
    var oldStyle = {
      top: element.getStyle('top'),
      left: element.getStyle('left'),
      opacity: element.getInlineOpacity() };
    return new Effect.Parallel(
      [ new Effect.Move(element, {x: 0, y: 100, sync: true }), 
        new Effect.Opacity(element, { sync: true, to: 0.0 }) ],
      Object.extend(
        { duration: 0.5,
          beforeSetup: function(effect) {
            effect.effects[0].element.makePositioned(); 
          },
          afterFinishInternal: function(effect) {
            effect.effects[0].element.hide().undoPositioned().setStyle(oldStyle);
          } 
        }, arguments[1] || { }));
  };
  
  Effect.Shake = function(element) {
    element = $(element);
    var options = Object.extend({
      distance: 20,
      duration: 0.5
    }, arguments[1] || {});
    var distance = parseFloat(options.distance);
    var split = parseFloat(options.duration) / 10.0;
    var oldStyle = {
      top: element.getStyle('top'),
      left: element.getStyle('left') };
      return new Effect.Move(element,
        { x:  distance, y: 0, duration: split, afterFinishInternal: function(effect) {
      new Effect.Move(effect.element,
        { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
      new Effect.Move(effect.element,
        { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
      new Effect.Move(effect.element,
        { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
      new Effect.Move(effect.element,
        { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
      new Effect.Move(effect.element,
        { x: -distance, y: 0, duration: split, afterFinishInternal: function(effect) {
          effect.element.undoPositioned().setStyle(oldStyle);
    }}) }}) }}) }}) }}) }});
  };
  
  Effect.SlideDown = function(element) {
    element = $(element).cleanWhitespace();
    // SlideDown need to have the content of the element wrapped in a container element with fixed height!
    var oldInnerBottom = element.down().getStyle('bottom');
    var elementDimensions = element.getDimensions();
    return new Effect.Scale(element, 100, Object.extend({ 
      scaleContent: false, 
      scaleX: false, 
      scaleFrom: window.opera ? 0 : 1,
      scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
      restoreAfterFinish: true,
      afterSetup: function(effect) {
        effect.element.makePositioned();
        effect.element.down().makePositioned();
        if (window.opera) effect.element.setStyle({top: ''});
        effect.element.makeClipping().setStyle({height: '0px'}).show(); 
      },
      afterUpdateInternal: function(effect) {
        effect.element.down().setStyle({bottom:
          (effect.dims[0] - effect.element.clientHeight) + 'px' }); 
      },
      afterFinishInternal: function(effect) {
        effect.element.undoClipping().undoPositioned();
        effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom}); }
      }, arguments[1] || { })
    );
  };
  
  Effect.SlideUp = function(element) {
    element = $(element).cleanWhitespace();
    var oldInnerBottom = element.down().getStyle('bottom');
    var elementDimensions = element.getDimensions();
    return new Effect.Scale(element, window.opera ? 0 : 1,
     Object.extend({ scaleContent: false, 
      scaleX: false, 
      scaleMode: 'box',
      scaleFrom: 100,
      scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
      restoreAfterFinish: true,
      afterSetup: function(effect) {
        effect.element.makePositioned();
        effect.element.down().makePositioned();
        if (window.opera) effect.element.setStyle({top: ''});
        effect.element.makeClipping().show();
      },  
      afterUpdateInternal: function(effect) {
        effect.element.down().setStyle({bottom:
          (effect.dims[0] - effect.element.clientHeight) + 'px' });
      },
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping().undoPositioned();
        effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom});
      }
     }, arguments[1] || { })
    );
  };
  
  // Bug in opera makes the TD containing this element expand for a instance after finish 
  Effect.Squish = function(element) {
    return new Effect.Scale(element, window.opera ? 1 : 0, { 
      restoreAfterFinish: true,
      beforeSetup: function(effect) {
        effect.element.makeClipping(); 
      },  
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping(); 
      }
    });
  };
  
  Effect.Grow = function(element) {
    element = $(element);
    var options = Object.extend({
      direction: 'center',
      moveTransition: Effect.Transitions.sinoidal,
      scaleTransition: Effect.Transitions.sinoidal,
      opacityTransition: Effect.Transitions.full
    }, arguments[1] || { });
    var oldStyle = {
      top: element.style.top,
      left: element.style.left,
      height: element.style.height,
      width: element.style.width,
      opacity: element.getInlineOpacity() };
  
    var dims = element.getDimensions();    
    var initialMoveX, initialMoveY;
    var moveX, moveY;
    
    switch (options.direction) {
      case 'top-left':
        initialMoveX = initialMoveY = moveX = moveY = 0; 
        break;
      case 'top-right':
        initialMoveX = dims.width;
        initialMoveY = moveY = 0;
        moveX = -dims.width;
        break;
      case 'bottom-left':
        initialMoveX = moveX = 0;
        initialMoveY = dims.height;
        moveY = -dims.height;
        break;
      case 'bottom-right':
        initialMoveX = dims.width;
        initialMoveY = dims.height;
        moveX = -dims.width;
        moveY = -dims.height;
        break;
      case 'center':
        initialMoveX = dims.width / 2;
        initialMoveY = dims.height / 2;
        moveX = -dims.width / 2;
        moveY = -dims.height / 2;
        break;
    }
    
    return new Effect.Move(element, {
      x: initialMoveX,
      y: initialMoveY,
      duration: 0.01, 
      beforeSetup: function(effect) {
        effect.element.hide().makeClipping().makePositioned();
      },
      afterFinishInternal: function(effect) {
        new Effect.Parallel(
          [ new Effect.Opacity(effect.element, { sync: true, to: 1.0, from: 0.0, transition: options.opacityTransition }),
            new Effect.Move(effect.element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition }),
            new Effect.Scale(effect.element, 100, {
              scaleMode: { originalHeight: dims.height, originalWidth: dims.width }, 
              sync: true, scaleFrom: window.opera ? 1 : 0, transition: options.scaleTransition, restoreAfterFinish: true})
          ], Object.extend({
               beforeSetup: function(effect) {
                 effect.effects[0].element.setStyle({height: '0px'}).show(); 
               },
               afterFinishInternal: function(effect) {
                 effect.effects[0].element.undoClipping().undoPositioned().setStyle(oldStyle); 
               }
             }, options)
        )
      }
    });
  };
  
  Effect.Shrink = function(element) {
    element = $(element);
    var options = Object.extend({
      direction: 'center',
      moveTransition: Effect.Transitions.sinoidal,
      scaleTransition: Effect.Transitions.sinoidal,
      opacityTransition: Effect.Transitions.none
    }, arguments[1] || { });
    var oldStyle = {
      top: element.style.top,
      left: element.style.left,
      height: element.style.height,
      width: element.style.width,
      opacity: element.getInlineOpacity() };
  
    var dims = element.getDimensions();
    var moveX, moveY;
    
    switch (options.direction) {
      case 'top-left':
        moveX = moveY = 0;
        break;
      case 'top-right':
        moveX = dims.width;
        moveY = 0;
        break;
      case 'bottom-left':
        moveX = 0;
        moveY = dims.height;
        break;
      case 'bottom-right':
        moveX = dims.width;
        moveY = dims.height;
        break;
      case 'center':  
        moveX = dims.width / 2;
        moveY = dims.height / 2;
        break;
    }
    
    return new Effect.Parallel(
      [ new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0, transition: options.opacityTransition }),
        new Effect.Scale(element, window.opera ? 1 : 0, { sync: true, transition: options.scaleTransition, restoreAfterFinish: true}),
        new Effect.Move(element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition })
      ], Object.extend({            
           beforeStartInternal: function(effect) {
             effect.effects[0].element.makePositioned().makeClipping(); 
           },
           afterFinishInternal: function(effect) {
             effect.effects[0].element.hide().undoClipping().undoPositioned().setStyle(oldStyle); }
         }, options)
    );
  };
  
  Effect.Pulsate = function(element) {
    element = $(element);
    var options    = arguments[1] || { };
    var oldOpacity = element.getInlineOpacity();
    var transition = options.transition || Effect.Transitions.sinoidal;
    var reverser   = function(pos){ return transition(1-Effect.Transitions.pulse(pos, options.pulses)) };
    reverser.bind(transition);
    return new Effect.Opacity(element, 
      Object.extend(Object.extend({  duration: 2.0, from: 0,
        afterFinishInternal: function(effect) { effect.element.setStyle({opacity: oldOpacity}); }
      }, options), {transition: reverser}));
  };
  
  Effect.Fold = function(element) {
    element = $(element);
    var oldStyle = {
      top: element.style.top,
      left: element.style.left,
      width: element.style.width,
      height: element.style.height };
    element.makeClipping();
    return new Effect.Scale(element, 5, Object.extend({   
      scaleContent: false,
      scaleX: false,
      afterFinishInternal: function(effect) {
      new Effect.Scale(element, 1, { 
        scaleContent: false, 
        scaleY: false,
        afterFinishInternal: function(effect) {
          effect.element.hide().undoClipping().setStyle(oldStyle);
        } });
    }}, arguments[1] || { }));
  };
  
  Effect.Morph = Class.create(Effect.Base, {
    initialize: function(element) {
      this.element = $(element);
      if (!this.element) throw(Effect._elementDoesNotExistError);
      var options = Object.extend({
        style: { }
      }, arguments[1] || { });
      
      if (!Object.isString(options.style)) this.style = $H(options.style);
      else {
        if (options.style.include(':'))
          this.style = options.style.parseStyle();
        else {
          this.element.addClassName(options.style);
          this.style = $H(this.element.getStyles());
          this.element.removeClassName(options.style);
          var css = this.element.getStyles();
          this.style = this.style.reject(function(style) {
            return style.value == css[style.key];
          });
          options.afterFinishInternal = function(effect) {
            effect.element.addClassName(effect.options.style);
            effect.transforms.each(function(transform) {
              effect.element.style[transform.style] = '';
            });
          }
        }
      }
      this.start(options);
    },
    
    setup: function(){
      function parseColor(color){
        if (!color || ['rgba(0, 0, 0, 0)','transparent'].include(color)) color = '#ffffff';
        color = color.parseColor();
        return $R(0,2).map(function(i){
          return parseInt( color.slice(i*2+1,i*2+3), 16 ) 
        });
      }
      this.transforms = this.style.map(function(pair){
        var property = pair[0], value = pair[1], unit = null;
  
        if (value.parseColor('#zzzzzz') != '#zzzzzz') {
          value = value.parseColor();
          unit  = 'color';
        } else if (property == 'opacity') {
          value = parseFloat(value);
          if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
            this.element.setStyle({zoom: 1});
        } else if (Element.CSS_LENGTH.test(value)) {
            var components = value.match(/^([\+\-]?[0-9\.]+)(.*)$/);
            value = parseFloat(components[1]);
            unit = (components.length == 3) ? components[2] : null;
        }
  
        var originalValue = this.element.getStyle(property);
        return { 
          style: property.camelize(), 
          originalValue: unit=='color' ? parseColor(originalValue) : parseFloat(originalValue || 0), 
          targetValue: unit=='color' ? parseColor(value) : value,
          unit: unit
        };
      }.bind(this)).reject(function(transform){
        return (
          (transform.originalValue == transform.targetValue) ||
          (
            transform.unit != 'color' &&
            (isNaN(transform.originalValue) || isNaN(transform.targetValue))
          )
        )
      });
    },
    update: function(position) {
      var style = { }, transform, i = this.transforms.length;
      while(i--)
        style[(transform = this.transforms[i]).style] = 
          transform.unit=='color' ? '#'+
            (Math.round(transform.originalValue[0]+
              (transform.targetValue[0]-transform.originalValue[0])*position)).toColorPart() +
            (Math.round(transform.originalValue[1]+
              (transform.targetValue[1]-transform.originalValue[1])*position)).toColorPart() +
            (Math.round(transform.originalValue[2]+
              (transform.targetValue[2]-transform.originalValue[2])*position)).toColorPart() :
          (transform.originalValue +
            (transform.targetValue - transform.originalValue) * position).toFixed(3) + 
              (transform.unit === null ? '' : transform.unit);
      this.element.setStyle(style, true);
    }
  });
  
  Effect.Transform = Class.create({
    initialize: function(tracks){
      this.tracks  = [];
      this.options = arguments[1] || { };
      this.addTracks(tracks);
    },
    addTracks: function(tracks){
      tracks.each(function(track){
        track = $H(track);
        var data = track.values().first();
        this.tracks.push($H({
          ids:     track.keys().first(),
          effect:  Effect.Morph,
          options: { style: data }
        }));
      }.bind(this));
      return this;
    },
    play: function(){
      return new Effect.Parallel(
        this.tracks.map(function(track){
          var ids = track.get('ids'), effect = track.get('effect'), options = track.get('options');
          var elements = [$(ids) || $$(ids)].flatten();
          return elements.map(function(e){ return new effect(e, Object.extend({ sync:true }, options)) });
        }).flatten(),
        this.options
      );
    }
  });
  
  Element.CSS_PROPERTIES = $w(
    'backgroundColor backgroundPosition borderBottomColor borderBottomStyle ' + 
    'borderBottomWidth borderLeftColor borderLeftStyle borderLeftWidth ' +
    'borderRightColor borderRightStyle borderRightWidth borderSpacing ' +
    'borderTopColor borderTopStyle borderTopWidth bottom clip color ' +
    'fontSize fontWeight height left letterSpacing lineHeight ' +
    'marginBottom marginLeft marginRight marginTop markerOffset maxHeight '+
    'maxWidth minHeight minWidth opacity outlineColor outlineOffset ' +
    'outlineWidth paddingBottom paddingLeft paddingRight paddingTop ' +
    'right textIndent top width wordSpacing zIndex');
    
  Element.CSS_LENGTH = /^(([\+\-]?[0-9\.]+)(em|ex|px|in|cm|mm|pt|pc|\%))|0$/;
  
  String.__parseStyleElement = document.createElement('div');
  String.prototype.parseStyle = function(){
    var style, styleRules = $H();
    if (Prototype.Browser.WebKit)
      style = new Element('div',{style:this}).style;
    else {
      String.__parseStyleElement.innerHTML = '<div style="' + this + '"></div>';
      style = String.__parseStyleElement.childNodes[0].style;
    }
    
    Element.CSS_PROPERTIES.each(function(property){
      if (style[property]) styleRules.set(property, style[property]); 
    });
    
    if (Prototype.Browser.IE && this.include('opacity'))
      styleRules.set('opacity', this.match(/opacity:\s*((?:0|1)?(?:\.\d*)?)/)[1]);
  
    return styleRules;
  };
  
  if (document.defaultView && document.defaultView.getComputedStyle) {
    Element.getStyles = function(element) {
      var css = document.defaultView.getComputedStyle($(element), null);
      return Element.CSS_PROPERTIES.inject({ }, function(styles, property) {
        styles[property] = css[property];
        return styles;
      });
    };
  } else {
    Element.getStyles = function(element) {
      element = $(element);
      var css = element.currentStyle, styles;
      styles = Element.CSS_PROPERTIES.inject({ }, function(hash, property) {
        hash.set(property, css[property]);
        return hash;
      });
      if (!styles.opacity) styles.set('opacity', element.getOpacity());
      return styles;
    };
  };
  
  Effect.Methods = {
    morph: function(element, style) {
      element = $(element);
      new Effect.Morph(element, Object.extend({ style: style }, arguments[2] || { }));
      return element;
    },
    visualEffect: function(element, effect, options) {
      element = $(element)
      var s = effect.dasherize().camelize(), klass = s.charAt(0).toUpperCase() + s.substring(1);
      new Effect[klass](element, options);
      return element;
    },
    highlight: function(element, options) {
      element = $(element);
      new Effect.Highlight(element, options);
      return element;
    }
  };
  
  $w('fade appear grow shrink fold blindUp blindDown slideUp slideDown '+
    'pulsate shake puff squish switchOff dropOut').each(
    function(effect) { 
      Effect.Methods[effect] = function(element, options){
        element = $(element);
        Effect[effect.charAt(0).toUpperCase() + effect.substring(1)](element, options);
        return element;
      }
    }
  );
  
  $w('getInlineOpacity forceRerendering setContentZoom collectTextNodes collectTextNodesIgnoreClass getStyles').each( 
    function(f) { Effect.Methods[f] = Element[f]; }
  );
  
  Element.addMethods(Effect.Methods);
  
  
  // Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
  //           (c) 2005-2007 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
  // 
  // script.aculo.us is freely distributable under the terms of an MIT-style license.
  // For details, see the script.aculo.us web site: http://script.aculo.us/
  
  if(Object.isUndefined(Effect))
    throw("dragdrop.js requires including script.aculo.us' effects.js library");
  
  var Droppables = {
    drops: [],
  
    remove: function(element) {
      this.drops = this.drops.reject(function(d) { return d.element==$(element) });
    },
  
    add: function(element) {
      element = $(element);
      var options = Object.extend({
        greedy:     true,
        hoverclass: null,
        tree:       false
      }, arguments[1] || { });
  
      // cache containers
      if(options.containment) {
        options._containers = [];
        var containment = options.containment;
        if(Object.isArray(containment)) {
          containment.each( function(c) { options._containers.push($(c)) });
        } else {
          options._containers.push($(containment));
        }
      }
      
      if(options.accept) options.accept = [options.accept].flatten();
  
      Element.makePositioned(element); // fix IE
      options.element = element;
  
      this.drops.push(options);
    },
    
    findDeepestChild: function(drops) {
      deepest = drops[0];
        
      for (i = 1; i < drops.length; ++i)
        if (Element.isParent(drops[i].element, deepest.element))
          deepest = drops[i];
      
      return deepest;
    },
  
    isContained: function(element, drop) {
      var containmentNode;
      if(drop.tree) {
        containmentNode = element.treeNode; 
      } else {
        containmentNode = element.parentNode;
      }
      return drop._containers.detect(function(c) { return containmentNode == c });
    },
    
    isAffected: function(point, element, drop) {
      return (
        (drop.element!=element) &&
        ((!drop._containers) ||
          this.isContained(element, drop)) &&
        ((!drop.accept) ||
          (Element.classNames(element).detect( 
            function(v) { return drop.accept.include(v) } ) )) &&
        Position.within(drop.element, point[0], point[1]) );
    },
  
    deactivate: function(drop) {
      if(drop.hoverclass)
        Element.removeClassName(drop.element, drop.hoverclass);
      this.last_active = null;
    },
  
    activate: function(drop) {
      if(drop.hoverclass)
        Element.addClassName(drop.element, drop.hoverclass);
      this.last_active = drop;
    },
  
    show: function(point, element) {
      if(!this.drops.length) return;
      var drop, affected = [];
      
      this.drops.each( function(drop) {
        if(Droppables.isAffected(point, element, drop))
          affected.push(drop);
      });
          
      if(affected.length>0)
        drop = Droppables.findDeepestChild(affected);
  
      if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
      if (drop) {
        Position.within(drop.element, point[0], point[1]);
        if(drop.onHover)
          drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
        
        if (drop != this.last_active) Droppables.activate(drop);
      }
    },
  
    fire: function(event, element) {
      if(!this.last_active) return;
      Position.prepare();
  
      if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
        if (this.last_active.onDrop) {
          this.last_active.onDrop(element, this.last_active.element, event); 
          return true; 
        }
    },
  
    reset: function() {
      if(this.last_active)
        this.deactivate(this.last_active);
    }
  }
  
  var Draggables = {
    drags: [],
    observers: [],
    
    register: function(draggable) {
      if(this.drags.length == 0) {
        this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
        this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
        this.eventKeypress  = this.keyPress.bindAsEventListener(this);
        
        Event.observe(document, "mouseup", this.eventMouseUp);
        Event.observe(document, "mousemove", this.eventMouseMove);
        Event.observe(document, "keypress", this.eventKeypress);
      }
      this.drags.push(draggable);
    },
    
    unregister: function(draggable) {
      this.drags = this.drags.reject(function(d) { return d==draggable });
      if(this.drags.length == 0) {
        Event.stopObserving(document, "mouseup", this.eventMouseUp);
        Event.stopObserving(document, "mousemove", this.eventMouseMove);
        Event.stopObserving(document, "keypress", this.eventKeypress);
      }
    },
    
    activate: function(draggable) {
      if(draggable.options.delay) { 
        this._timeout = setTimeout(function() { 
          Draggables._timeout = null; 
          window.focus(); 
          Draggables.activeDraggable = draggable; 
        }.bind(this), draggable.options.delay); 
      } else {
        window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
        this.activeDraggable = draggable;
      }
    },
    
    deactivate: function() {
      this.activeDraggable = null;
    },
    
    updateDrag: function(event) {
      if(!this.activeDraggable) return;
      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      // Mozilla-based browsers fire successive mousemove events with
      // the same coordinates, prevent needless redrawing (moz bug?)
      if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
      this._lastPointer = pointer;
      
      this.activeDraggable.updateDrag(event, pointer);
    },
    
    endDrag: function(event) {
      if(this._timeout) { 
        clearTimeout(this._timeout); 
        this._timeout = null; 
      }
      if(!this.activeDraggable) return;
      this._lastPointer = null;
      this.activeDraggable.endDrag(event);
      this.activeDraggable = null;
    },
    
    keyPress: function(event) {
      if(this.activeDraggable)
        this.activeDraggable.keyPress(event);
    },
    
    addObserver: function(observer) {
      this.observers.push(observer);
      this._cacheObserverCallbacks();
    },
    
    removeObserver: function(element) {  // element instead of observer fixes mem leaks
      this.observers = this.observers.reject( function(o) { return o.element==element });
      this._cacheObserverCallbacks();
    },
    
    notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
      if(this[eventName+'Count'] > 0)
        this.observers.each( function(o) {
          if(o[eventName]) o[eventName](eventName, draggable, event);
        });
      if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
    },
    
    _cacheObserverCallbacks: function() {
      ['onStart','onEnd','onDrag'].each( function(eventName) {
        Draggables[eventName+'Count'] = Draggables.observers.select(
          function(o) { return o[eventName]; }
        ).length;
      });
    }
  }
  
  /*--------------------------------------------------------------------------*/
  
  var Draggable = Class.create({
    initialize: function(element) {
      var defaults = {
        handle: false,
        reverteffect: function(element, top_offset, left_offset) {
          var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
          new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
            queue: {scope:'_draggable', position:'end'}
          });
        },
        endeffect: function(element) {
          var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;
          new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity, 
            queue: {scope:'_draggable', position:'end'},
            afterFinish: function(){ 
              Draggable._dragging[element] = false 
            }
          }); 
        },
        zindex: 1000,
        revert: false,
        quiet: false,
        scroll: false,
        scrollSensitivity: 20,
        scrollSpeed: 15,
        snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }
        delay: 0
      };
      
      if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
        Object.extend(defaults, {
          starteffect: function(element) {
            element._opacity = Element.getOpacity(element);
            Draggable._dragging[element] = true;
            new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7}); 
          }
        });
      
      var options = Object.extend(defaults, arguments[1] || { });
  
      this.element = $(element);
      
      if(options.handle && Object.isString(options.handle))
        this.handle = this.element.down('.'+options.handle, 0);
      
      if(!this.handle) this.handle = $(options.handle);
      if(!this.handle) this.handle = this.element;
      
      if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
        options.scroll = $(options.scroll);
        this._isScrollChild = Element.childOf(this.element, options.scroll);
      }
  
      Element.makePositioned(this.element); // fix IE    
  
      this.options  = options;
      this.dragging = false;   
  
      this.eventMouseDown = this.initDrag.bindAsEventListener(this);
      Event.observe(this.handle, "mousedown", this.eventMouseDown);
      
      Draggables.register(this);
    },
    
    destroy: function() {
      Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
      Draggables.unregister(this);
    },
    
    currentDelta: function() {
      return([
        parseInt(Element.getStyle(this.element,'left') || '0'),
        parseInt(Element.getStyle(this.element,'top') || '0')]);
    },
    
    initDrag: function(event) {
      if(!Object.isUndefined(Draggable._dragging[this.element]) &&
        Draggable._dragging[this.element]) return;
      if(Event.isLeftClick(event)) {    
        // abort on form elements, fixes a Firefox issue
        var src = Event.element(event);
        if((tag_name = src.tagName.toUpperCase()) && (
          tag_name=='INPUT' ||
          tag_name=='SELECT' ||
          tag_name=='OPTION' ||
          tag_name=='BUTTON' ||
          tag_name=='TEXTAREA')) return;
          
        var pointer = [Event.pointerX(event), Event.pointerY(event)];
        var pos     = Position.cumulativeOffset(this.element);
        this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
        
        Draggables.activate(this);
        Event.stop(event);
      }
    },
    
    startDrag: function(event) {
      this.dragging = true;
      if(!this.delta)
        this.delta = this.currentDelta();
      
      if(this.options.zindex) {
        this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
        this.element.style.zIndex = this.options.zindex;
      }
      
      if(this.options.ghosting) {
        this._clone = this.element.cloneNode(true);
        this.element._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
        if (!this.element._originallyAbsolute)
          Position.absolutize(this.element);
        this.element.parentNode.insertBefore(this._clone, this.element);
      }
      
      if(this.options.scroll) {
        if (this.options.scroll == window) {
          var where = this._getWindowScroll(this.options.scroll);
          this.originalScrollLeft = where.left;
          this.originalScrollTop = where.top;
        } else {
          this.originalScrollLeft = this.options.scroll.scrollLeft;
          this.originalScrollTop = this.options.scroll.scrollTop;
        }
      }
      
      Draggables.notify('onStart', this, event);
          
      if(this.options.starteffect) this.options.starteffect(this.element);
    },
    
    updateDrag: function(event, pointer) {
      if(!this.dragging) this.startDrag(event);
      
      if(!this.options.quiet){
        Position.prepare();
        Droppables.show(pointer, this.element);
      }
      
      Draggables.notify('onDrag', this, event);
      
      this.draw(pointer);
      if(this.options.change) this.options.change(this);
      
      if(this.options.scroll) {
        this.stopScrolling();
        
        var p;
        if (this.options.scroll == window) {
          with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
        } else {
          p = Position.page(this.options.scroll);
          p[0] += this.options.scroll.scrollLeft + Position.deltaX;
          p[1] += this.options.scroll.scrollTop + Position.deltaY;
          p.push(p[0]+this.options.scroll.offsetWidth);
          p.push(p[1]+this.options.scroll.offsetHeight);
        }
        var speed = [0,0];
        if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
        if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
        if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
        if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
        this.startScrolling(speed);
      }
      
      // fix AppleWebKit rendering
      if(Prototype.Browser.WebKit) window.scrollBy(0,0);
      
      Event.stop(event);
    },
    
    finishDrag: function(event, success) {
      this.dragging = false;
      
      if(this.options.quiet){
        Position.prepare();
        var pointer = [Event.pointerX(event), Event.pointerY(event)];
        Droppables.show(pointer, this.element);
      }
  
      if(this.options.ghosting) {
        if (!this.element._originallyAbsolute)
          Position.relativize(this.element);
        delete this.element._originallyAbsolute;
        Element.remove(this._clone);
        this._clone = null;
      }
  
      var dropped = false; 
      if(success) { 
        dropped = Droppables.fire(event, this.element); 
        if (!dropped) dropped = false; 
      }
      if(dropped && this.options.onDropped) this.options.onDropped(this.element);
      Draggables.notify('onEnd', this, event);
  
      var revert = this.options.revert;
      if(revert && Object.isFunction(revert)) revert = revert(this.element);
      
      var d = this.currentDelta();
      if(revert && this.options.reverteffect) {
        if (dropped == 0 || revert != 'failure')
          this.options.reverteffect(this.element,
            d[1]-this.delta[1], d[0]-this.delta[0]);
      } else {
        this.delta = d;
      }
  
      if(this.options.zindex)
        this.element.style.zIndex = this.originalZ;
  
      if(this.options.endeffect) 
        this.options.endeffect(this.element);
        
      Draggables.deactivate(this);
      Droppables.reset();
    },
    
    keyPress: function(event) {
      if(event.keyCode!=Event.KEY_ESC) return;
      this.finishDrag(event, false);
      Event.stop(event);
    },
    
    endDrag: function(event) {
      if(!this.dragging) return;
      this.stopScrolling();
      this.finishDrag(event, true);
      Event.stop(event);
    },
    
    draw: function(point) {
      var pos = Position.cumulativeOffset(this.element);
      if(this.options.ghosting) {
        var r   = Position.realOffset(this.element);
        pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
      }
      
      var d = this.currentDelta();
      pos[0] -= d[0]; pos[1] -= d[1];
      
      if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
        pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
        pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
      }
      
      var p = [0,1].map(function(i){ 
        return (point[i]-pos[i]-this.offset[i]) 
      }.bind(this));
      
      if(this.options.snap) {
        if(Object.isFunction(this.options.snap)) {
          p = this.options.snap(p[0],p[1],this);
        } else {
        if(Object.isArray(this.options.snap)) {
          p = p.map( function(v, i) {
            return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this))
        } else {
          p = p.map( function(v) {
            return (v/this.options.snap).round()*this.options.snap }.bind(this))
        }
      }}
      
      var style = this.element.style;
      if((!this.options.constraint) || (this.options.constraint=='horizontal'))
        style.left = p[0] + "px";
      if((!this.options.constraint) || (this.options.constraint=='vertical'))
        style.top  = p[1] + "px";
      
      if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
    },
    
    stopScrolling: function() {
      if(this.scrollInterval) {
        clearInterval(this.scrollInterval);
        this.scrollInterval = null;
        Draggables._lastScrollPointer = null;
      }
    },
    
    startScrolling: function(speed) {
      if(!(speed[0] || speed[1])) return;
      this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
      this.lastScrolled = new Date();
      this.scrollInterval = setInterval(this.scroll.bind(this), 10);
    },
    
    scroll: function() {
      var current = new Date();
      var delta = current - this.lastScrolled;
      this.lastScrolled = current;
      if(this.options.scroll == window) {
        with (this._getWindowScroll(this.options.scroll)) {
          if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
            var d = delta / 1000;
            this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
          }
        }
      } else {
        this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
        this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
      }
      
      Position.prepare();
      Droppables.show(Draggables._lastPointer, this.element);
      Draggables.notify('onDrag', this);
      if (this._isScrollChild) {
        Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
        Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
        Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
        if (Draggables._lastScrollPointer[0] < 0)
          Draggables._lastScrollPointer[0] = 0;
        if (Draggables._lastScrollPointer[1] < 0)
          Draggables._lastScrollPointer[1] = 0;
        this.draw(Draggables._lastScrollPointer);
      }
      
      if(this.options.change) this.options.change(this);
    },
    
    _getWindowScroll: function(w) {
      var T, L, W, H;
      with (w.document) {
        if (w.document.documentElement && documentElement.scrollTop) {
          T = documentElement.scrollTop;
          L = documentElement.scrollLeft;
        } else if (w.document.body) {
          T = body.scrollTop;
          L = body.scrollLeft;
        }
        if (w.innerWidth) {
          W = w.innerWidth;
          H = w.innerHeight;
        } else if (w.document.documentElement && documentElement.clientWidth) {
          W = documentElement.clientWidth;
          H = documentElement.clientHeight;
        } else {
          W = body.offsetWidth;
          H = body.offsetHeight
        }
      }
      return { top: T, left: L, width: W, height: H };
    }
  });
  
  Draggable._dragging = { };
  
  /*--------------------------------------------------------------------------*/
  
  var SortableObserver = Class.create({
    initialize: function(element, observer) {
      this.element   = $(element);
      this.observer  = observer;
      this.lastValue = Sortable.serialize(this.element);
    },
    
    onStart: function() {
      this.lastValue = Sortable.serialize(this.element);
    },
    
    onEnd: function() {
      Sortable.unmark();
      if(this.lastValue != Sortable.serialize(this.element))
        this.observer(this.element)
    }
  });
  
  var Sortable = {
    SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
    
    sortables: { },
    
    _findRootElement: function(element) {
      while (element.tagName.toUpperCase() != "BODY") {  
        if(element.id && Sortable.sortables[element.id]) return element;
        element = element.parentNode;
      }
    },
  
    options: function(element) {
      element = Sortable._findRootElement($(element));
      if(!element) return;
      return Sortable.sortables[element.id];
    },
    
    destroy: function(element){
      var s = Sortable.options(element);
      
      if(s) {
        Draggables.removeObserver(s.element);
        s.droppables.each(function(d){ Droppables.remove(d) });
        s.draggables.invoke('destroy');
        
        delete Sortable.sortables[s.element.id];
      }
    },
  
    create: function(element) {
      element = $(element);
      var options = Object.extend({ 
        element:     element,
        tag:         'li',       // assumes li children, override with tag: 'tagname'
        dropOnEmpty: false,
        tree:        false,
        treeTag:     'ul',
        overlap:     'vertical', // one of 'vertical', 'horizontal'
        constraint:  'vertical', // one of 'vertical', 'horizontal', false
        containment: element,    // also takes array of elements (or id's); or false
        handle:      false,      // or a CSS class
        only:        false,
        delay:       0,
        hoverclass:  null,
        ghosting:    false,
        quiet:       false, 
        scroll:      false,
        scrollSensitivity: 20,
        scrollSpeed: 15,
        format:      this.SERIALIZE_RULE,
        
        // these take arrays of elements or ids and can be 
        // used for better initialization performance
        elements:    false,
        handles:     false,
        
        onChange:    Prototype.emptyFunction,
        onUpdate:    Prototype.emptyFunction
      }, arguments[1] || { });
  
      // clear any old sortable with same element
      this.destroy(element);
  
      // build options for the draggables
      var options_for_draggable = {
        revert:      true,
        quiet:       options.quiet,
        scroll:      options.scroll,
        scrollSpeed: options.scrollSpeed,
        scrollSensitivity: options.scrollSensitivity,
        delay:       options.delay,
        ghosting:    options.ghosting,
        constraint:  options.constraint,
        handle:      options.handle };
  
      if(options.starteffect)
        options_for_draggable.starteffect = options.starteffect;
  
      if(options.reverteffect)
        options_for_draggable.reverteffect = options.reverteffect;
      else
        if(options.ghosting) options_for_draggable.reverteffect = function(element) {
          element.style.top  = 0;
          element.style.left = 0;
        };
  
      if(options.endeffect)
        options_for_draggable.endeffect = options.endeffect;
  
      if(options.zindex)
        options_for_draggable.zindex = options.zindex;
  
      // build options for the droppables  
      var options_for_droppable = {
        overlap:     options.overlap,
        containment: options.containment,
        tree:        options.tree,
        hoverclass:  options.hoverclass,
        onHover:     Sortable.onHover
      }
      
      var options_for_tree = {
        onHover:      Sortable.onEmptyHover,
        overlap:      options.overlap,
        containment:  options.containment,
        hoverclass:   options.hoverclass
      }
  
      // fix for gecko engine
      Element.cleanWhitespace(element); 
  
      options.draggables = [];
      options.droppables = [];
  
      // drop on empty handling
      if(options.dropOnEmpty || options.tree) {
        Droppables.add(element, options_for_tree);
        options.droppables.push(element);
      }
  
      (options.elements || this.findElements(element, options) || []).each( function(e,i) {
        var handle = options.handles ? $(options.handles[i]) :
          (options.handle ? $(e).select('.' + options.handle)[0] : e); 
        options.draggables.push(
          new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
        Droppables.add(e, options_for_droppable);
        if(options.tree) e.treeNode = element;
        options.droppables.push(e);      
      });
      
      if(options.tree) {
        (Sortable.findTreeElements(element, options) || []).each( function(e) {
          Droppables.add(e, options_for_tree);
          e.treeNode = element;
          options.droppables.push(e);
        });
      }
  
      // keep reference
      this.sortables[element.id] = options;
  
      // for onupdate
      Draggables.addObserver(new SortableObserver(element, options.onUpdate));
  
    },
  
    // return all suitable-for-sortable elements in a guaranteed order
    findElements: function(element, options) {
      return Element.findChildren(
        element, options.only, options.tree ? true : false, options.tag);
    },
    
    findTreeElements: function(element, options) {
      return Element.findChildren(
        element, options.only, options.tree ? true : false, options.treeTag);
    },
  
    onHover: function(element, dropon, overlap) {
      if(Element.isParent(dropon, element)) return;
  
      if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
        return;
      } else if(overlap>0.5) {
        Sortable.mark(dropon, 'before');
        if(dropon.previousSibling != element) {
          var oldParentNode = element.parentNode;
          element.style.visibility = "hidden"; // fix gecko rendering
          dropon.parentNode.insertBefore(element, dropon);
          if(dropon.parentNode!=oldParentNode) 
            Sortable.options(oldParentNode).onChange(element);
          Sortable.options(dropon.parentNode).onChange(element);
        }
      } else {
        Sortable.mark(dropon, 'after');
        var nextElement = dropon.nextSibling || null;
        if(nextElement != element) {
          var oldParentNode = element.parentNode;
          element.style.visibility = "hidden"; // fix gecko rendering
          dropon.parentNode.insertBefore(element, nextElement);
          if(dropon.parentNode!=oldParentNode) 
            Sortable.options(oldParentNode).onChange(element);
          Sortable.options(dropon.parentNode).onChange(element);
        }
      }
    },
    
    onEmptyHover: function(element, dropon, overlap) {
      var oldParentNode = element.parentNode;
      var droponOptions = Sortable.options(dropon);
          
      if(!Element.isParent(dropon, element)) {
        var index;
        
        var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
        var child = null;
              
        if(children) {
          var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
          
          for (index = 0; index < children.length; index += 1) {
            if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
              offset -= Element.offsetSize (children[index], droponOptions.overlap);
            } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
              child = index + 1 < children.length ? children[index + 1] : null;
              break;
            } else {
              child = children[index];
              break;
            }
          }
        }
        
        dropon.insertBefore(element, child);
        
        Sortable.options(oldParentNode).onChange(element);
        droponOptions.onChange(element);
      }
    },
  
    unmark: function() {
      if(Sortable._marker) Sortable._marker.hide();
    },
  
    mark: function(dropon, position) {
      // mark on ghosting only
      var sortable = Sortable.options(dropon.parentNode);
      if(sortable && !sortable.ghosting) return; 
  
      if(!Sortable._marker) {
        Sortable._marker = 
          ($('dropmarker') || Element.extend(document.createElement('DIV'))).
            hide().addClassName('dropmarker').setStyle({position:'absolute'});
        document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
      }    
      var offsets = Position.cumulativeOffset(dropon);
      Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
      
      if(position=='after')
        if(sortable.overlap == 'horizontal') 
          Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
        else
          Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
      
      Sortable._marker.show();
    },
    
    _tree: function(element, options, parent) {
      var children = Sortable.findElements(element, options) || [];
    
      for (var i = 0; i < children.length; ++i) {
        var match = children[i].id.match(options.format);
  
        if (!match) continue;
        
        var child = {
          id: encodeURIComponent(match ? match[1] : null),
          element: element,
          parent: parent,
          children: [],
          position: parent.children.length,
          container: $(children[i]).down(options.treeTag)
        }
        
        /* Get the element containing the children and recurse over it */
        if (child.container)
          this._tree(child.container, options, child)
        
        parent.children.push (child);
      }
  
      return parent; 
    },
  
    tree: function(element) {
      element = $(element);
      var sortableOptions = this.options(element);
      var options = Object.extend({
        tag: sortableOptions.tag,
        treeTag: sortableOptions.treeTag,
        only: sortableOptions.only,
        name: element.id,
        format: sortableOptions.format
      }, arguments[1] || { });
      
      var root = {
        id: null,
        parent: null,
        children: [],
        container: element,
        position: 0
      }
      
      return Sortable._tree(element, options, root);
    },
  
    /* Construct a [i] index for a particular node */
    _constructIndex: function(node) {
      var index = '';
      do {
        if (node.id) index = '[' + node.position + ']' + index;
      } while ((node = node.parent) != null);
      return index;
    },
  
    sequence: function(element) {
      element = $(element);
      var options = Object.extend(this.options(element), arguments[1] || { });
      
      return $(this.findElements(element, options) || []).map( function(item) {
        return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
      });
    },
  
    setSequence: function(element, new_sequence) {
      element = $(element);
      var options = Object.extend(this.options(element), arguments[2] || { });
      
      var nodeMap = { };
      this.findElements(element, options).each( function(n) {
          if (n.id.match(options.format))
              nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
          n.parentNode.removeChild(n);
      });
     
      new_sequence.each(function(ident) {
        var n = nodeMap[ident];
        if (n) {
          n[1].appendChild(n[0]);
          delete nodeMap[ident];
        }
      });
    },
    
    serialize: function(element) {
      element = $(element);
      var options = Object.extend(Sortable.options(element), arguments[1] || { });
      var name = encodeURIComponent(
        (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
      
      if (options.tree) {
        return Sortable.tree(element, arguments[1]).children.map( function (item) {
          return [name + Sortable._constructIndex(item) + "[id]=" + 
                  encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
        }).flatten().join('&');
      } else {
        return Sortable.sequence(element, arguments[1]).map( function(item) {
          return name + "[]=" + encodeURIComponent(item);
        }).join('&');
      }
    }
  }
  
  // Returns true if child is contained within element
  Element.isParent = function(child, element) {
    if (!child.parentNode || child == element) return false;
    if (child.parentNode == element) return true;
    return Element.isParent(child.parentNode, element);
  }
  
  Element.findChildren = function(element, only, recursive, tagName) {   
    if(!element.hasChildNodes()) return null;
    tagName = tagName.toUpperCase();
    if(only) only = [only].flatten();
    var elements = [];
    $A(element.childNodes).each( function(e) {
      if(e.tagName && e.tagName.toUpperCase()==tagName &&
        (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
          elements.push(e);
      if(recursive) {
        var grandchildren = Element.findChildren(e, only, recursive, tagName);
        if(grandchildren) elements.push(grandchildren);
      }
    });
  
    return (elements.length>0 ? elements.flatten() : []);
  }
  
  Element.offsetSize = function (element, type) {
    return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
  }
  
  
  // Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
  //           (c) 2005-2007 Ivan Krstic (http://blogs.law.harvard.edu/ivan)
  //           (c) 2005-2007 Jon Tirsen (http://www.tirsen.com)
  // Contributors:
  //  Richard Livsey
  //  Rahul Bhargava
  //  Rob Wills
  // 
  // script.aculo.us is freely distributable under the terms of an MIT-style license.
  // For details, see the script.aculo.us web site: http://script.aculo.us/
  
  // Autocompleter.Base handles all the autocompletion functionality 
  // that's independent of the data source for autocompletion. This
  // includes drawing the autocompletion menu, observing keyboard
  // and mouse events, and similar.
  //
  // Specific autocompleters need to provide, at the very least, 
  // a getUpdatedChoices function that will be invoked every time
  // the text inside the monitored textbox changes. This method 
  // should get the text for which to provide autocompletion by
  // invoking this.getToken(), NOT by directly accessing
  // this.element.value. This is to allow incremental tokenized
  // autocompletion. Specific auto-completion logic (AJAX, etc)
  // belongs in getUpdatedChoices.
  //
  // Tokenized incremental autocompletion is enabled automatically
  // when an autocompleter is instantiated with the 'tokens' option
  // in the options parameter, e.g.:
  // new Ajax.Autocompleter('id','upd', '/url/', { tokens: ',' });
  // will incrementally autocomplete with a comma as the token.
  // Additionally, ',' in the above example can be replaced with
  // a token array, e.g. { tokens: [',', '\n'] } which
  // enables autocompletion on multiple tokens. This is most 
  // useful when one of the tokens is \n (a newline), as it 
  // allows smart autocompletion after linebreaks.
  
  if(typeof Effect == 'undefined')
    throw("controls.js requires including script.aculo.us' effects.js library");
  
  var Autocompleter = { }
  Autocompleter.Base = Class.create({
    baseInitialize: function(element, update, options) {
      element          = $(element)
      this.element     = element; 
      this.update      = $(update);  
      this.hasFocus    = false; 
      this.changed     = false; 
      this.active      = false; 
      this.index       = 0;     
      this.entryCount  = 0;
      this.oldElementValue = this.element.value;
  
      if(this.setOptions)
        this.setOptions(options);
      else
        this.options = options || { };
  
      this.options.paramName    = this.options.paramName || this.element.name;
      this.options.tokens       = this.options.tokens || [];
      this.options.frequency    = this.options.frequency || 0.4;
      this.options.minChars     = this.options.minChars || 1;
      this.options.onShow       = this.options.onShow || 
        function(element, update){ 
          if(!update.style.position || update.style.position=='absolute') {
            update.style.position = 'absolute';
            Position.clone(element, update, {
              setHeight: false, 
              offsetTop: element.offsetHeight
            });
          }
          Effect.Appear(update,{duration:0.15});
        };
      this.options.onHide = this.options.onHide || 
        function(element, update){ new Effect.Fade(update,{duration:0.15}) };
  
      if(typeof(this.options.tokens) == 'string') 
        this.options.tokens = new Array(this.options.tokens);
      // Force carriage returns as token delimiters anyway
      if (!this.options.tokens.include('\n'))
        this.options.tokens.push('\n');
  
      this.observer = null;
      
      this.element.setAttribute('autocomplete','off');
  
      Element.hide(this.update);
  
      Event.observe(this.element, 'blur', this.onBlur.bindAsEventListener(this));
      Event.observe(this.element, 'keydown', this.onKeyPress.bindAsEventListener(this));
    },
  
    show: function() {
      if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update);
      if(!this.iefix && 
        (Prototype.Browser.IE) &&
        (Element.getStyle(this.update, 'position')=='absolute')) {
        new Insertion.After(this.update, 
         '<iframe id="' + this.update.id + '_iefix" '+
         'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' +
         'src="javascript:false;" frameborder="0" scrolling="no"></iframe>');
        this.iefix = $(this.update.id+'_iefix');
      }
      if(this.iefix) setTimeout(this.fixIEOverlapping.bind(this), 50);
    },
    
    fixIEOverlapping: function() {
      Position.clone(this.update, this.iefix, {setTop:(!this.update.style.height)});
      this.iefix.style.zIndex = 1;
      this.update.style.zIndex = 2;
      Element.show(this.iefix);
    },
  
    hide: function() {
      this.stopIndicator();
      if(Element.getStyle(this.update, 'display')!='none') this.options.onHide(this.element, this.update);
      if(this.iefix) Element.hide(this.iefix);
    },
  
    startIndicator: function() {
      if(this.options.indicator) Element.show(this.options.indicator);
    },
  
    stopIndicator: function() {
      if(this.options.indicator) Element.hide(this.options.indicator);
    },
  
    onKeyPress: function(event) {
      if(this.active)
        switch(event.keyCode) {
         case Event.KEY_TAB:
         case Event.KEY_RETURN:
           this.selectEntry();
           Event.stop(event);
         case Event.KEY_ESC:
           this.hide();
           this.active = false;
           Event.stop(event);
           return;
         case Event.KEY_LEFT:
         case Event.KEY_RIGHT:
           return;
         case Event.KEY_UP:
           this.markPrevious();
           this.render();
           Event.stop(event);
           return;
         case Event.KEY_DOWN:
           this.markNext();
           this.render();
           Event.stop(event);
           return;
        }
       else 
         if(event.keyCode==Event.KEY_TAB || event.keyCode==Event.KEY_RETURN || 
           (Prototype.Browser.WebKit > 0 && event.keyCode == 0)) return;
  
      this.changed = true;
      this.hasFocus = true;
  
      if(this.observer) clearTimeout(this.observer);
        this.observer = 
          setTimeout(this.onObserverEvent.bind(this), this.options.frequency*1000);
    },
  
    activate: function() {
      this.changed = false;
      this.hasFocus = true;
      this.getUpdatedChoices();
    },
  
    onHover: function(event) {
      var element = Event.findElement(event, 'LI');
      if(this.index != element.autocompleteIndex) 
      {
          this.index = element.autocompleteIndex;
          this.render();
      }
      Event.stop(event);
    },
    
    onClick: function(event) {
      var element = Event.findElement(event, 'LI');
      this.index = element.autocompleteIndex;
      this.selectEntry();
      this.hide();
    },
    
    onBlur: function(event) {
      // needed to make click events working
      setTimeout(this.hide.bind(this), 250);
      this.hasFocus = false;
      this.active = false;     
    }, 
    
    render: function() {
      if(this.entryCount > 0) {
        for (var i = 0; i < this.entryCount; i++)
          this.index==i ? 
            Element.addClassName(this.getEntry(i),"selected") : 
            Element.removeClassName(this.getEntry(i),"selected");
        if(this.hasFocus) { 
          this.show();
          this.active = true;
        }
      } else {
        this.active = false;
        this.hide();
      }
    },
    
    markPrevious: function() {
      if(this.index > 0) this.index--
        else this.index = this.entryCount-1;
      this.getEntry(this.index).scrollIntoView(true);
    },
    
    markNext: function() {
      if(this.index < this.entryCount-1) this.index++
        else this.index = 0;
      this.getEntry(this.index).scrollIntoView(false);
    },
    
    getEntry: function(index) {
      return this.update.firstChild.childNodes[index];
    },
    
    getCurrentEntry: function() {
      return this.getEntry(this.index);
    },
    
    selectEntry: function() {
      this.active = false;
      this.updateElement(this.getCurrentEntry());
    },
  
    updateElement: function(selectedElement) {
      if (this.options.updateElement) {
        this.options.updateElement(selectedElement);
        return;
      }
      var value = '';
      if (this.options.select) {
        var nodes = $(selectedElement).select('.' + this.options.select) || [];
        if(nodes.length>0) value = Element.collectTextNodes(nodes[0], this.options.select);
      } else
        value = Element.collectTextNodesIgnoreClass(selectedElement, 'informal');
      
      var bounds = this.getTokenBounds();
      if (bounds[0] != -1) {
        var newValue = this.element.value.substr(0, bounds[0]);
        var whitespace = this.element.value.substr(bounds[0]).match(/^\s+/);
        if (whitespace)
          newValue += whitespace[0];
        this.element.value = newValue + value + this.element.value.substr(bounds[1]);
      } else {
        this.element.value = value;
      }
      this.oldElementValue = this.element.value;
      this.element.focus();
      
      if (this.options.afterUpdateElement)
        this.options.afterUpdateElement(this.element, selectedElement);
    },
  
    updateChoices: function(choices) {
      if(!this.changed && this.hasFocus) {
        this.update.innerHTML = choices;
        Element.cleanWhitespace(this.update);
        Element.cleanWhitespace(this.update.down());
  
        if(this.update.firstChild && this.update.down().childNodes) {
          this.entryCount = 
            this.update.down().childNodes.length;
          for (var i = 0; i < this.entryCount; i++) {
            var entry = this.getEntry(i);
            entry.autocompleteIndex = i;
            this.addObservers(entry);
          }
        } else { 
          this.entryCount = 0;
        }
  
        this.stopIndicator();
        this.index = 0;
        
        if(this.entryCount==1 && this.options.autoSelect) {
          this.selectEntry();
          this.hide();
        } else {
          this.render();
        }
      }
    },
  
    addObservers: function(element) {
      Event.observe(element, "mouseover", this.onHover.bindAsEventListener(this));
      Event.observe(element, "click", this.onClick.bindAsEventListener(this));
    },
  
    onObserverEvent: function() {
      this.changed = false;   
      this.tokenBounds = null;
      if(this.getToken().length>=this.options.minChars) {
        this.getUpdatedChoices();
      } else {
        this.active = false;
        this.hide();
      }
      this.oldElementValue = this.element.value;
    },
  
    getToken: function() {
      var bounds = this.getTokenBounds();
      return this.element.value.substring(bounds[0], bounds[1]).strip();
    },
  
    getTokenBounds: function() {
      if (null != this.tokenBounds) return this.tokenBounds;
      var value = this.element.value;
      if (value.strip().empty()) return [-1, 0];
      var diff = arguments.callee.getFirstDifferencePos(value, this.oldElementValue);
      var offset = (diff == this.oldElementValue.length ? 1 : 0);
      var prevTokenPos = -1, nextTokenPos = value.length;
      var tp;
      for (var index = 0, l = this.options.tokens.length; index < l; ++index) {
        tp = value.lastIndexOf(this.options.tokens[index], diff + offset - 1);
        if (tp > prevTokenPos) prevTokenPos = tp;
        tp = value.indexOf(this.options.tokens[index], diff + offset);
        if (-1 != tp && tp < nextTokenPos) nextTokenPos = tp;
      }
      return (this.tokenBounds = [prevTokenPos + 1, nextTokenPos]);
    }
  });
  
  Autocompleter.Base.prototype.getTokenBounds.getFirstDifferencePos = function(newS, oldS) {
    var boundary = Math.min(newS.length, oldS.length);
    for (var index = 0; index < boundary; ++index)
      if (newS[index] != oldS[index])
        return index;
    return boundary;
  };
  
  Ajax.Autocompleter = Class.create(Autocompleter.Base, {
    initialize: function(element, update, url, options) {
      this.baseInitialize(element, update, options);
      this.options.asynchronous  = true;
      this.options.onComplete    = this.onComplete.bind(this);
      this.options.defaultParams = this.options.parameters || null;
      this.url                   = url;
    },
  
    getUpdatedChoices: function() {
      this.startIndicator();
      
      var entry = encodeURIComponent(this.options.paramName) + '=' + 
        encodeURIComponent(this.getToken());
  
      this.options.parameters = this.options.callback ?
        this.options.callback(this.element, entry) : entry;
  
      if(this.options.defaultParams) 
        this.options.parameters += '&' + this.options.defaultParams;
      
      new Ajax.Request(this.url, this.options);
    },
  
    onComplete: function(request) {
      this.updateChoices(request.responseText);
    }
  });
  
  // The local array autocompleter. Used when you'd prefer to
  // inject an array of autocompletion options into the page, rather
  // than sending out Ajax queries, which can be quite slow sometimes.
  //
  // The constructor takes four parameters. The first two are, as usual,
  // the id of the monitored textbox, and id of the autocompletion menu.
  // The third is the array you want to autocomplete from, and the fourth
  // is the options block.
  //
  // Extra local autocompletion options:
  // - choices - How many autocompletion choices to offer
  //
  // - partialSearch - If false, the autocompleter will match entered
  //                    text only at the beginning of strings in the 
  //                    autocomplete array. Defaults to true, which will
  //                    match text at the beginning of any *word* in the
  //                    strings in the autocomplete array. If you want to
  //                    search anywhere in the string, additionally set
  //                    the option fullSearch to true (default: off).
  //
  // - fullSsearch - Search anywhere in autocomplete array strings.
  //
  // - partialChars - How many characters to enter before triggering
  //                   a partial match (unlike minChars, which defines
  //                   how many characters are required to do any match
  //                   at all). Defaults to 2.
  //
  // - ignoreCase - Whether to ignore case when autocompleting.
  //                 Defaults to true.
  //
  // It's possible to pass in a custom function as the 'selector' 
  // option, if you prefer to write your own autocompletion logic.
  // In that case, the other options above will not apply unless
  // you support them.
  
  Autocompleter.Local = Class.create(Autocompleter.Base, {
    initialize: function(element, update, array, options) {
      this.baseInitialize(element, update, options);
      this.options.array = array;
    },
  
    getUpdatedChoices: function() {
      this.updateChoices(this.options.selector(this));
    },
  
    setOptions: function(options) {
      this.options = Object.extend({
        choices: 10,
        partialSearch: true,
        partialChars: 2,
        ignoreCase: true,
        fullSearch: false,
        selector: function(instance) {
          var ret       = []; // Beginning matches
          var partial   = []; // Inside matches
          var entry     = instance.getToken();
          var count     = 0;
  
          for (var i = 0; i < instance.options.array.length &&  
            ret.length < instance.options.choices ; i++) { 
  
            var elem = instance.options.array[i];
            var foundPos = instance.options.ignoreCase ? 
              elem.toLowerCase().indexOf(entry.toLowerCase()) : 
              elem.indexOf(entry);
  
            while (foundPos != -1) {
              if (foundPos == 0 && elem.length != entry.length) { 
                ret.push("<li><strong>" + elem.substr(0, entry.length) + "</strong>" + 
                  elem.substr(entry.length) + "</li>");
                break;
              } else if (entry.length >= instance.options.partialChars && 
                instance.options.partialSearch && foundPos != -1) {
                if (instance.options.fullSearch || /\s/.test(elem.substr(foundPos-1,1))) {
                  partial.push("<li>" + elem.substr(0, foundPos) + "<strong>" +
                    elem.substr(foundPos, entry.length) + "</strong>" + elem.substr(
                    foundPos + entry.length) + "</li>");
                  break;
                }
              }
  
              foundPos = instance.options.ignoreCase ? 
                elem.toLowerCase().indexOf(entry.toLowerCase(), foundPos + 1) : 
                elem.indexOf(entry, foundPos + 1);
  
            }
          }
          if (partial.length)
            ret = ret.concat(partial.slice(0, instance.options.choices - ret.length))
          return "<ul>" + ret.join('') + "</ul>";
        }
      }, options || { });
    }
  });
  
  // AJAX in-place editor and collection editor
  // Full rewrite by Christophe Porteneuve <tdd@tddsworld.com> (April 2007).
  
  // Use this if you notice weird scrolling problems on some browsers,
  // the DOM might be a bit confused when this gets called so do this
  // waits 1 ms (with setTimeout) until it does the activation
  Field.scrollFreeActivate = function(field) {
    setTimeout(function() {
      Field.activate(field);
    }, 1);
  }
  
  Ajax.InPlaceEditor = Class.create({
    initialize: function(element, url, options) {
      this.url = url;
      this.element = element = $(element);
      this.prepareOptions();
      this._controls = { };
      arguments.callee.dealWithDeprecatedOptions(options); // DEPRECATION LAYER!!!
      Object.extend(this.options, options || { });
      if (!this.options.formId && this.element.id) {
        this.options.formId = this.element.id + '-inplaceeditor';
        if ($(this.options.formId))
          this.options.formId = '';
      }
      if (this.options.externalControl)
        this.options.externalControl = $(this.options.externalControl);
      if (!this.options.externalControl)
        this.options.externalControlOnly = false;
      this._originalBackground = this.element.getStyle('background-color') || 'transparent';
      this.element.title = this.options.clickToEditText;
      this._boundCancelHandler = this.handleFormCancellation.bind(this);
      this._boundComplete = (this.options.onComplete || Prototype.emptyFunction).bind(this);
      this._boundFailureHandler = this.handleAJAXFailure.bind(this);
      this._boundSubmitHandler = this.handleFormSubmission.bind(this);
      this._boundWrapperHandler = this.wrapUp.bind(this);
      this.registerListeners();
    },
    checkForEscapeOrReturn: function(e) {
      if (!this._editing || e.ctrlKey || e.altKey || e.shiftKey) return;
      if (Event.KEY_ESC == e.keyCode)
        this.handleFormCancellation(e);
      else if (Event.KEY_RETURN == e.keyCode)
        this.handleFormSubmission(e);
    },
    createControl: function(mode, handler, extraClasses) {
      var control = this.options[mode + 'Control'];
      var text = this.options[mode + 'Text'];
      if ('button' == control) {
        var btn = document.createElement('input');
        btn.type = 'submit';
        btn.value = text;
        btn.className = 'editor_' + mode + '_button';
        if ('cancel' == mode)
          btn.onclick = this._boundCancelHandler;
        this._form.appendChild(btn);
        this._controls[mode] = btn;
      } else if ('link' == control) {
        var link = document.createElement('a');
        link.href = '#';
        link.appendChild(document.createTextNode(text));
        link.onclick = 'cancel' == mode ? this._boundCancelHandler : this._boundSubmitHandler;
        link.className = 'editor_' + mode + '_link';
        if (extraClasses)
          link.className += ' ' + extraClasses;
        this._form.appendChild(link);
        this._controls[mode] = link;
      }
    },
    createEditField: function() {
      var text = (this.options.loadTextURL ? this.options.loadingText : this.getText());
      var fld;
      if (1 >= this.options.rows && !/\r|\n/.test(this.getText())) {
        fld = document.createElement('input');
        fld.type = 'text';
        var size = this.options.size || this.options.cols || 0;
        if (0 < size) fld.size = size;
      } else {
        fld = document.createElement('textarea');
        fld.rows = (1 >= this.options.rows ? this.options.autoRows : this.options.rows);
        fld.cols = this.options.cols || 40;
      }
      fld.name = this.options.paramName;
      fld.value = text; // No HTML breaks conversion anymore
      fld.className = 'editor_field';
      if (this.options.submitOnBlur)
        fld.onblur = this._boundSubmitHandler;
      this._controls.editor = fld;
      if (this.options.loadTextURL)
        this.loadExternalText();
      this._form.appendChild(this._controls.editor);
    },
    createForm: function() {
      var ipe = this;
      function addText(mode, condition) {
        var text = ipe.options['text' + mode + 'Controls'];
        if (!text || condition === false) return;
        ipe._form.appendChild(document.createTextNode(text));
      };
      this._form = $(document.createElement('form'));
      this._form.id = this.options.formId;
      this._form.addClassName(this.options.formClassName);
      this._form.onsubmit = this._boundSubmitHandler;
      this.createEditField();
      if ('textarea' == this._controls.editor.tagName.toLowerCase())
        this._form.appendChild(document.createElement('br'));
      if (this.options.onFormCustomization)
        this.options.onFormCustomization(this, this._form);
      addText('Before', this.options.okControl || this.options.cancelControl);
      this.createControl('ok', this._boundSubmitHandler);
      addText('Between', this.options.okControl && this.options.cancelControl);
      this.createControl('cancel', this._boundCancelHandler, 'editor_cancel');
      addText('After', this.options.okControl || this.options.cancelControl);
    },
    destroy: function() {
      if (this._oldInnerHTML)
        this.element.innerHTML = this._oldInnerHTML;
      this.leaveEditMode();
      this.unregisterListeners();
    },
    enterEditMode: function(e) {
      if (this._saving || this._editing) return;
      this._editing = true;
      this.triggerCallback('onEnterEditMode');
      if (this.options.externalControl)
        this.options.externalControl.hide();
      this.element.hide();
      this.createForm();
      this.element.parentNode.insertBefore(this._form, this.element);
      if (!this.options.loadTextURL)
        this.postProcessEditField();
      if (e) Event.stop(e);
    },
    enterHover: function(e) {
      if (this.options.hoverClassName)
        this.element.addClassName(this.options.hoverClassName);
      if (this._saving) return;
      this.triggerCallback('onEnterHover');
    },
    getText: function() {
      return this.element.innerHTML;
    },
    handleAJAXFailure: function(transport) {
      this.triggerCallback('onFailure', transport);
      if (this._oldInnerHTML) {
        this.element.innerHTML = this._oldInnerHTML;
        this._oldInnerHTML = null;
      }
    },
    handleFormCancellation: function(e) {
      this.wrapUp();
      if (e) Event.stop(e);
    },
    handleFormSubmission: function(e) {
      var form = this._form;
      var value = $F(this._controls.editor);
      this.prepareSubmission();
      var params = this.options.callback(form, value) || '';
      if (Object.isString(params))
        params = params.toQueryParams();
      params.editorId = this.element.id;
      if (this.options.htmlResponse) {
        var options = Object.extend({ evalScripts: true }, this.options.ajaxOptions);
        Object.extend(options, {
          parameters: params,
          onComplete: this._boundWrapperHandler,
          onFailure: this._boundFailureHandler
        });
        new Ajax.Updater({ success: this.element }, this.url, options);
      } else {
        var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
        Object.extend(options, {
          parameters: params,
          onComplete: this._boundWrapperHandler,
          onFailure: this._boundFailureHandler
        });
        new Ajax.Request(this.url, options);
      }
      if (e) Event.stop(e);
    },
    leaveEditMode: function() {
      this.element.removeClassName(this.options.savingClassName);
      this.removeForm();
      this.leaveHover();
      this.element.style.backgroundColor = this._originalBackground;
      this.element.show();
      if (this.options.externalControl)
        this.options.externalControl.show();
      this._saving = false;
      this._editing = false;
      this._oldInnerHTML = null;
      this.triggerCallback('onLeaveEditMode');
    },
    leaveHover: function(e) {
      if (this.options.hoverClassName)
        this.element.removeClassName(this.options.hoverClassName);
      if (this._saving) return;
      this.triggerCallback('onLeaveHover');
    },
    loadExternalText: function() {
      this._form.addClassName(this.options.loadingClassName);
      this._controls.editor.disabled = true;
      var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: 'editorId=' + encodeURIComponent(this.element.id),
        onComplete: Prototype.emptyFunction,
        onSuccess: function(transport) {
          this._form.removeClassName(this.options.loadingClassName);
          var text = transport.responseText;
          if (this.options.stripLoadedTextTags)
            text = text.stripTags();
          this._controls.editor.value = text;
          this._controls.editor.disabled = false;
          this.postProcessEditField();
        }.bind(this),
        onFailure: this._boundFailureHandler
      });
      new Ajax.Request(this.options.loadTextURL, options);
    },
    postProcessEditField: function() {
      var fpc = this.options.fieldPostCreation;
      if (fpc)
        $(this._controls.editor)['focus' == fpc ? 'focus' : 'activate']();
    },
    prepareOptions: function() {
      this.options = Object.clone(Ajax.InPlaceEditor.DefaultOptions);
      Object.extend(this.options, Ajax.InPlaceEditor.DefaultCallbacks);
      [this._extraDefaultOptions].flatten().compact().each(function(defs) {
        Object.extend(this.options, defs);
      }.bind(this));
    },
    prepareSubmission: function() {
      this._saving = true;
      this.removeForm();
      this.leaveHover();
      this.showSaving();
    },
    registerListeners: function() {
      this._listeners = { };
      var listener;
      $H(Ajax.InPlaceEditor.Listeners).each(function(pair) {
        listener = this[pair.value].bind(this);
        this._listeners[pair.key] = listener;
        if (!this.options.externalControlOnly)
          this.element.observe(pair.key, listener);
        if (this.options.externalControl)
          this.options.externalControl.observe(pair.key, listener);
      }.bind(this));
    },
    removeForm: function() {
      if (!this._form) return;
      this._form.remove();
      this._form = null;
      this._controls = { };
    },
    showSaving: function() {
      this._oldInnerHTML = this.element.innerHTML;
      this.element.innerHTML = this.options.savingText;
      this.element.addClassName(this.options.savingClassName);
      this.element.style.backgroundColor = this._originalBackground;
      this.element.show();
    },
    triggerCallback: function(cbName, arg) {
      if ('function' == typeof this.options[cbName]) {
        this.options[cbName](this, arg);
      }
    },
    unregisterListeners: function() {
      $H(this._listeners).each(function(pair) {
        if (!this.options.externalControlOnly)
          this.element.stopObserving(pair.key, pair.value);
        if (this.options.externalControl)
          this.options.externalControl.stopObserving(pair.key, pair.value);
      }.bind(this));
    },
    wrapUp: function(transport) {
      this.leaveEditMode();
      // Can't use triggerCallback due to backward compatibility: requires
      // binding + direct element
      this._boundComplete(transport, this.element);
    }
  });
  
  Object.extend(Ajax.InPlaceEditor.prototype, {
    dispose: Ajax.InPlaceEditor.prototype.destroy
  });
  
  Ajax.InPlaceCollectionEditor = Class.create(Ajax.InPlaceEditor, {
    initialize: function($super, element, url, options) {
      this._extraDefaultOptions = Ajax.InPlaceCollectionEditor.DefaultOptions;
      $super(element, url, options);
    },
  
    createEditField: function() {
      var list = document.createElement('select');
      list.name = this.options.paramName;
      list.size = 1;
      this._controls.editor = list;
      this._collection = this.options.collection || [];
      if (this.options.loadCollectionURL)
        this.loadCollection();
      else
        this.checkForExternalText();
      this._form.appendChild(this._controls.editor);
    },
  
    loadCollection: function() {
      this._form.addClassName(this.options.loadingClassName);
      this.showLoadingText(this.options.loadingCollectionText);
      var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: 'editorId=' + encodeURIComponent(this.element.id),
        onComplete: Prototype.emptyFunction,
        onSuccess: function(transport) {
          var js = transport.responseText.strip();
          if (!/^\[.*\]$/.test(js)) // TODO: improve sanity check
            throw 'Server returned an invalid collection representation.';
          this._collection = eval(js);
          this.checkForExternalText();
        }.bind(this),
        onFailure: this.onFailure
      });
      new Ajax.Request(this.options.loadCollectionURL, options);
    },
  
    showLoadingText: function(text) {
      this._controls.editor.disabled = true;
      var tempOption = this._controls.editor.firstChild;
      if (!tempOption) {
        tempOption = document.createElement('option');
        tempOption.value = '';
        this._controls.editor.appendChild(tempOption);
        tempOption.selected = true;
      }
      tempOption.update((text || '').stripScripts().stripTags());
    },
  
    checkForExternalText: function() {
      this._text = this.getText();
      if (this.options.loadTextURL)
        this.loadExternalText();
      else
        this.buildOptionList();
    },
  
    loadExternalText: function() {
      this.showLoadingText(this.options.loadingText);
      var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: 'editorId=' + encodeURIComponent(this.element.id),
        onComplete: Prototype.emptyFunction,
        onSuccess: function(transport) {
          this._text = transport.responseText.strip();
          this.buildOptionList();
        }.bind(this),
        onFailure: this.onFailure
      });
      new Ajax.Request(this.options.loadTextURL, options);
    },
  
    buildOptionList: function() {
      this._form.removeClassName(this.options.loadingClassName);
      this._collection = this._collection.map(function(entry) {
        return 2 === entry.length ? entry : [entry, entry].flatten();
      });
      var marker = ('value' in this.options) ? this.options.value : this._text;
      var textFound = this._collection.any(function(entry) {
        return entry[0] == marker;
      }.bind(this));
      this._controls.editor.update('');
      var option;
      this._collection.each(function(entry, index) {
        option = document.createElement('option');
        option.value = entry[0];
        option.selected = textFound ? entry[0] == marker : 0 == index;
        option.appendChild(document.createTextNode(entry[1]));
        this._controls.editor.appendChild(option);
      }.bind(this));
      this._controls.editor.disabled = false;
      Field.scrollFreeActivate(this._controls.editor);
    }
  });
  
  //**** DEPRECATION LAYER FOR InPlace[Collection]Editor! ****
  //**** This only  exists for a while,  in order to  let ****
  //**** users adapt to  the new API.  Read up on the new ****
  //**** API and convert your code to it ASAP!            ****
  
  Ajax.InPlaceEditor.prototype.initialize.dealWithDeprecatedOptions = function(options) {
    if (!options) return;
    function fallback(name, expr) {
      if (name in options || expr === undefined) return;
      options[name] = expr;
    };
    fallback('cancelControl', (options.cancelLink ? 'link' : (options.cancelButton ? 'button' :
      options.cancelLink == options.cancelButton == false ? false : undefined)));
    fallback('okControl', (options.okLink ? 'link' : (options.okButton ? 'button' :
      options.okLink == options.okButton == false ? false : undefined)));
    fallback('highlightColor', options.highlightcolor);
    fallback('highlightEndColor', options.highlightendcolor);
  };
  
  Object.extend(Ajax.InPlaceEditor, {
    DefaultOptions: {
      ajaxOptions: { },
      autoRows: 3,                                // Use when multi-line w/ rows == 1
      cancelControl: 'link',                      // 'link'|'button'|false
      cancelText: 'cancel',
      clickToEditText: 'Click to edit',
      externalControl: null,                      // id|elt
      externalControlOnly: false,
      fieldPostCreation: 'activate',              // 'activate'|'focus'|false
      formClassName: 'inplaceeditor-form',
      formId: null,                               // id|elt
      highlightColor: '#ffff99',
      highlightEndColor: '#ffffff',
      hoverClassName: '',
      htmlResponse: true,
      loadingClassName: 'inplaceeditor-loading',
      loadingText: 'Loading...',
      okControl: 'button',                        // 'link'|'button'|false
      okText: 'ok',
      paramName: 'value',
      rows: 1,                                    // If 1 and multi-line, uses autoRows
      savingClassName: 'inplaceeditor-saving',
      savingText: 'Saving...',
      size: 0,
      stripLoadedTextTags: false,
      submitOnBlur: false,
      textAfterControls: '',
      textBeforeControls: '',
      textBetweenControls: ''
    },
    DefaultCallbacks: {
      callback: function(form) {
        return Form.serialize(form);
      },
      onComplete: function(transport, element) {
        // For backward compatibility, this one is bound to the IPE, and passes
        // the element directly.  It was too often customized, so we don't break it.
        new Effect.Highlight(element, {
          startcolor: this.options.highlightColor, keepBackgroundImage: true });
      },
      onEnterEditMode: null,
      onEnterHover: function(ipe) {
        ipe.element.style.backgroundColor = ipe.options.highlightColor;
        if (ipe._effect)
          ipe._effect.cancel();
      },
      onFailure: function(transport, ipe) {
        alert('Error communication with the server: ' + transport.responseText.stripTags());
      },
      onFormCustomization: null, // Takes the IPE and its generated form, after editor, before controls.
      onLeaveEditMode: null,
      onLeaveHover: function(ipe) {
        ipe._effect = new Effect.Highlight(ipe.element, {
          startcolor: ipe.options.highlightColor, endcolor: ipe.options.highlightEndColor,
          restorecolor: ipe._originalBackground, keepBackgroundImage: true
        });
      }
    },
    Listeners: {
      click: 'enterEditMode',
      keydown: 'checkForEscapeOrReturn',
      mouseover: 'enterHover',
      mouseout: 'leaveHover'
    }
  });
  
  Ajax.InPlaceCollectionEditor.DefaultOptions = {
    loadingCollectionText: 'Loading options...'
  };
  
  // Delayed observer, like Form.Element.Observer, 
  // but waits for delay after last key input
  // Ideal for live-search fields
  
  Form.Element.DelayedObserver = Class.create({
    initialize: function(element, delay, callback) {
      this.delay     = delay || 0.5;
      this.element   = $(element);
      this.callback  = callback;
      this.timer     = null;
      this.lastValue = $F(this.element); 
      Event.observe(this.element,'keyup',this.delayedListener.bindAsEventListener(this));
    },
    delayedListener: function(event) {
      if(this.lastValue == $F(this.element)) return;
      if(this.timer) clearTimeout(this.timer);
      this.timer = setTimeout(this.onTimerEvent.bind(this), this.delay * 1000);
      this.lastValue = $F(this.element);
    },
    onTimerEvent: function() {
      this.timer = null;
      this.callback(this.element, $F(this.element));
    }
  });
  
  
  // Place your application-specific JavaScript functions and classes here
  // This file is automatically included by javascript_include_tag :defaults
  