text: /*  Prototype JavaScript framework, version 1.7.2
   *  (c) 2005-2010 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: '1.7.2',
  
    Browser: (function(){
      var ua = navigator.userAgent;
      var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
      return {
        IE:             !!window.attachEvent && !isOpera,
        Opera:          isOpera,
        WebKit:         ua.indexOf('AppleWebKit/') > -1,
        Gecko:          ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1,
        MobileSafari:   /Apple.*Mobile/.test(ua)
      }
    })(),
  
    BrowserFeatures: {
      XPath: !!document.evaluate,
  
      SelectorsAPI: !!document.querySelector,
  
      ElementExtensions: (function() {
        var constructor = window.Element || window.HTMLElement;
        return !!(constructor && constructor.prototype);
      })(),
      SpecificElementExtensions: (function() {
        if (typeof window.HTMLDivElement !== 'undefined')
          return true;
  
        var div = document.createElement('div'),
            form = document.createElement('form'),
            isSupported = false;
  
        if (div['__proto__'] && (div['__proto__'] !== form['__proto__'])) {
          isSupported = true;
        }
  
        div = form = null;
  
        return isSupported;
      })()
    },
  
    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script\\s*>',
    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 = (function() {
  
    var IS_DONTENUM_BUGGY = (function(){
      for (var p in { toString: 1 }) {
        if (p === 'toString') return false;
      }
      return true;
    })();
  
    function subclass() {};
    function create() {
      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) {
        subclass.prototype = parent.prototype;
        klass.prototype = new subclass;
        parent.subclasses.push(klass);
      }
  
      for (var i = 0, length = properties.length; i < length; i++)
        klass.addMethods(properties[i]);
  
      if (!klass.prototype.initialize)
        klass.prototype.initialize = Prototype.emptyFunction;
  
      klass.prototype.constructor = klass;
      return klass;
    }
  
    function addMethods(source) {
      var ancestor   = this.superclass && this.superclass.prototype,
          properties = Object.keys(source);
  
      if (IS_DONTENUM_BUGGY) {
        if (source.toString != Object.prototype.toString)
          properties.push("toString");
        if (source.valueOf != Object.prototype.valueOf)
          properties.push("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()[0] == "$super") {
          var method = value;
          value = (function(m) {
            return function() { return ancestor[m].apply(this, arguments); };
          })(property).wrap(method);
  
          value.valueOf = (function(method) {
            return function() { return method.valueOf.call(method); };
          })(method);
  
          value.toString = (function(method) {
            return function() { return method.toString.call(method); };
          })(method);
        }
        this.prototype[property] = value;
      }
  
      return this;
    }
  
    return {
      create: create,
      Methods: {
        addMethods: addMethods
      }
    };
  })();
  (function() {
  
    var _toString = Object.prototype.toString,
        _hasOwnProperty = Object.prototype.hasOwnProperty,
        NULL_TYPE = 'Null',
        UNDEFINED_TYPE = 'Undefined',
        BOOLEAN_TYPE = 'Boolean',
        NUMBER_TYPE = 'Number',
        STRING_TYPE = 'String',
        OBJECT_TYPE = 'Object',
        FUNCTION_CLASS = '[object Function]',
        BOOLEAN_CLASS = '[object Boolean]',
        NUMBER_CLASS = '[object Number]',
        STRING_CLASS = '[object String]',
        ARRAY_CLASS = '[object Array]',
        DATE_CLASS = '[object Date]',
        NATIVE_JSON_STRINGIFY_SUPPORT = window.JSON &&
          typeof JSON.stringify === 'function' &&
          JSON.stringify(0) === '0' &&
          typeof JSON.stringify(Prototype.K) === 'undefined';
  
  
  
    var DONT_ENUMS = ['toString', 'toLocaleString', 'valueOf',
     'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', 'constructor'];
  
    var IS_DONTENUM_BUGGY = (function(){
      for (var p in { toString: 1 }) {
        if (p === 'toString') return false;
      }
      return true;
    })();
  
    function Type(o) {
      switch(o) {
        case null: return NULL_TYPE;
        case (void 0): return UNDEFINED_TYPE;
      }
      var type = typeof o;
      switch(type) {
        case 'boolean': return BOOLEAN_TYPE;
        case 'number':  return NUMBER_TYPE;
        case 'string':  return STRING_TYPE;
      }
      return OBJECT_TYPE;
    }
  
    function extend(destination, source) {
      for (var property in source)
        destination[property] = source[property];
      return destination;
    }
  
    function inspect(object) {
      try {
        if (isUndefined(object)) return 'undefined';
        if (object === null) return 'null';
        return object.inspect ? object.inspect() : String(object);
      } catch (e) {
        if (e instanceof RangeError) return '...';
        throw e;
      }
    }
  
    function toJSON(value) {
      return Str('', { '': value }, []);
    }
  
    function Str(key, holder, stack) {
      var value = holder[key];
      if (Type(value) === OBJECT_TYPE && typeof value.toJSON === 'function') {
        value = value.toJSON(key);
      }
  
      var _class = _toString.call(value);
  
      switch (_class) {
        case NUMBER_CLASS:
        case BOOLEAN_CLASS:
        case STRING_CLASS:
          value = value.valueOf();
      }
  
      switch (value) {
        case null: return 'null';
        case true: return 'true';
        case false: return 'false';
      }
  
      var type = typeof value;
      switch (type) {
        case 'string':
          return value.inspect(true);
        case 'number':
          return isFinite(value) ? String(value) : 'null';
        case 'object':
  
          for (var i = 0, length = stack.length; i < length; i++) {
            if (stack[i] === value) {
              throw new TypeError("Cyclic reference to '" + value + "' in object");
            }
          }
          stack.push(value);
  
          var partial = [];
          if (_class === ARRAY_CLASS) {
            for (var i = 0, length = value.length; i < length; i++) {
              var str = Str(i, value, stack);
              partial.push(typeof str === 'undefined' ? 'null' : str);
            }
            partial = '[' + partial.join(',') + ']';
          } else {
            var keys = Object.keys(value);
            for (var i = 0, length = keys.length; i < length; i++) {
              var key = keys[i], str = Str(key, value, stack);
              if (typeof str !== "undefined") {
                 partial.push(key.inspect(true)+ ':' + str);
               }
            }
            partial = '{' + partial.join(',') + '}';
          }
          stack.pop();
          return partial;
      }
    }
  
    function stringify(object) {
      return JSON.stringify(object);
    }
  
    function toQueryString(object) {
      return $H(object).toQueryString();
    }
  
    function toHTML(object) {
      return object && object.toHTML ? object.toHTML() : String.interpret(object);
    }
  
    function keys(object) {
      if (Type(object) !== OBJECT_TYPE) { throw new TypeError(); }
      var results = [];
      for (var property in object) {
        if (_hasOwnProperty.call(object, property))
          results.push(property);
      }
  
      if (IS_DONTENUM_BUGGY) {
        for (var i = 0; property = DONT_ENUMS[i]; i++) {
          if (_hasOwnProperty.call(object, property))
            results.push(property);
        }
      }
  
      return results;
    }
  
    function values(object) {
      var results = [];
      for (var property in object)
        results.push(object[property]);
      return results;
    }
  
    function clone(object) {
      return extend({ }, object);
    }
  
    function isElement(object) {
      return !!(object && object.nodeType == 1);
    }
  
    function isArray(object) {
      return _toString.call(object) === ARRAY_CLASS;
    }
  
    var hasNativeIsArray = (typeof Array.isArray == 'function')
      && Array.isArray([]) && !Array.isArray({});
  
    if (hasNativeIsArray) {
      isArray = Array.isArray;
    }
  
    function isHash(object) {
      return object instanceof Hash;
    }
  
    function isFunction(object) {
      return _toString.call(object) === FUNCTION_CLASS;
    }
  
    function isString(object) {
      return _toString.call(object) === STRING_CLASS;
    }
  
    function isNumber(object) {
      return _toString.call(object) === NUMBER_CLASS;
    }
  
    function isDate(object) {
      return _toString.call(object) === DATE_CLASS;
    }
  
    function isUndefined(object) {
      return typeof object === "undefined";
    }
  
    extend(Object, {
      extend:        extend,
      inspect:       inspect,
      toJSON:        NATIVE_JSON_STRINGIFY_SUPPORT ? stringify : toJSON,
      toQueryString: toQueryString,
      toHTML:        toHTML,
      keys:          Object.keys || keys,
      values:        values,
      clone:         clone,
      isElement:     isElement,
      isArray:       isArray,
      isHash:        isHash,
      isFunction:    isFunction,
      isString:      isString,
      isNumber:      isNumber,
      isDate:        isDate,
      isUndefined:   isUndefined
    });
  })();
  Object.extend(Function.prototype, (function() {
    var slice = Array.prototype.slice;
  
    function update(array, args) {
      var arrayLength = array.length, length = args.length;
      while (length--) array[arrayLength + length] = args[length];
      return array;
    }
  
    function merge(array, args) {
      array = slice.call(array, 0);
      return update(array, args);
    }
  
    function argumentNames() {
      var names = this.toString().match(/^[\s\(]*function[^(]*\(([^)]*)\)/)[1]
        .replace(/\/\/.*?[\r\n]|\/\*(?:.|[\r\n])*?\*\//g, '')
        .replace(/\s+/g, '').split(',');
      return names.length == 1 && !names[0] ? [] : names;
    }
  
  
    function bind(context) {
      if (arguments.length < 2 && Object.isUndefined(arguments[0]))
        return this;
  
      if (!Object.isFunction(this))
        throw new TypeError("The object is not callable.");
  
      var nop = function() {};
      var __method = this, args = slice.call(arguments, 1);
  
      var bound = function() {
        var a = merge(args, arguments);
        var c = this instanceof bound ? this : context;
        return __method.apply(c, a);
      };
  
      nop.prototype   = this.prototype;
      bound.prototype = new nop();
  
      return bound;
    }
  
    function bindAsEventListener(context) {
      var __method = this, args = slice.call(arguments, 1);
      return function(event) {
        var a = update([event || window.event], args);
        return __method.apply(context, a);
      }
    }
  
    function curry() {
      if (!arguments.length) return this;
      var __method = this, args = slice.call(arguments, 0);
      return function() {
        var a = merge(args, arguments);
        return __method.apply(this, a);
      }
    }
  
    function delay(timeout) {
      var __method = this, args = slice.call(arguments, 1);
      timeout = timeout * 1000;
      return window.setTimeout(function() {
        return __method.apply(__method, args);
      }, timeout);
    }
  
    function defer() {
      var args = update([0.01], arguments);
      return this.delay.apply(this, args);
    }
  
    function wrap(wrapper) {
      var __method = this;
      return function() {
        var a = update([__method.bind(this)], arguments);
        return wrapper.apply(this, a);
      }
    }
  
    function methodize() {
      if (this._methodized) return this._methodized;
      var __method = this;
      return this._methodized = function() {
        var a = update([this], arguments);
        return __method.apply(null, a);
      };
    }
  
    var extensions = {
      argumentNames:       argumentNames,
      bindAsEventListener: bindAsEventListener,
      curry:               curry,
      delay:               delay,
      defer:               defer,
      wrap:                wrap,
      methodize:           methodize
    };
  
    if (!Function.prototype.bind)
      extensions.bind = bind;
  
    return extensions;
  })());
  
  
  
  (function(proto) {
  
  
    function toISOString() {
      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';
    }
  
  
    function toJSON() {
      return this.toISOString();
    }
  
    if (!proto.toISOString) proto.toISOString = toISOString;
    if (!proto.toJSON) proto.toJSON = toJSON;
  
  })(Date.prototype);
  
  
  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();
          this.currentlyExecuting = false;
        } catch(e) {
          this.currentlyExecuting = false;
          throw e;
        }
      }
    }
  });
  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, (function() {
    var NATIVE_JSON_PARSE_SUPPORT = window.JSON &&
      typeof JSON.parse === 'function' &&
      JSON.parse('{"test": true}').test;
  
    function prepareReplacement(replacement) {
      if (Object.isFunction(replacement)) return replacement;
      var template = new Template(replacement);
      return function(match) { return template.evaluate(match) };
    }
  
    function isNonEmptyRegExp(regexp) {
      return regexp.source && regexp.source !== '(?:)';
    }
  
  
    function gsub(pattern, replacement) {
      var result = '', source = this, match;
      replacement = prepareReplacement(replacement);
  
      if (Object.isString(pattern))
        pattern = RegExp.escape(pattern);
  
      if (!(pattern.length || isNonEmptyRegExp(pattern))) {
        replacement = replacement('');
        return replacement + source.split('').join(replacement) + replacement;
      }
  
      while (source.length > 0) {
        match = source.match(pattern)
        if (match && match[0].length > 0) {
          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;
    }
  
    function sub(pattern, replacement, count) {
      replacement = prepareReplacement(replacement);
      count = Object.isUndefined(count) ? 1 : count;
  
      return this.gsub(pattern, function(match) {
        if (--count < 0) return match[0];
        return replacement(match);
      });
    }
  
    function scan(pattern, iterator) {
      this.gsub(pattern, iterator);
      return String(this);
    }
  
    function truncate(length, truncation) {
      length = length || 30;
      truncation = Object.isUndefined(truncation) ? '...' : truncation;
      return this.length > length ?
        this.slice(0, length - truncation.length) + truncation : String(this);
    }
  
    function strip() {
      return this.replace(/^\s+/, '').replace(/\s+$/, '');
    }
  
    function stripTags() {
      return this.replace(/<\w+(\s+("[^"]*"|'[^']*'|[^>])+)?>|<\/\w+>/gi, '');
    }
  
    function stripScripts() {
      return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    }
  
    function extractScripts() {
      var matchAll = new RegExp(Prototype.ScriptFragment, 'img'),
          matchOne = new RegExp(Prototype.ScriptFragment, 'im');
      return (this.match(matchAll) || []).map(function(scriptTag) {
        return (scriptTag.match(matchOne) || ['', ''])[1];
      });
    }
  
    function evalScripts() {
      return this.extractScripts().map(function(script) { return eval(script); });
    }
  
    function escapeHTML() {
      return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
    }
  
    function unescapeHTML() {
      return this.stripTags().replace(/&lt;/g,'<').replace(/&gt;/g,'>').replace(/&amp;/g,'&');
    }
  
  
    function toQueryParams(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()),
              value = pair.length > 1 ? pair.join('=') : pair[0];
  
          if (value != undefined) {
            value = value.gsub('+', ' ');
            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;
      });
    }
  
    function toArray() {
      return this.split('');
    }
  
    function succ() {
      return this.slice(0, this.length - 1) +
        String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    }
  
    function times(count) {
      return count < 1 ? '' : new Array(count + 1).join(this);
    }
  
    function camelize() {
      return this.replace(/-+(.)?/g, function(match, chr) {
        return chr ? chr.toUpperCase() : '';
      });
    }
  
    function capitalize() {
      return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    }
  
    function underscore() {
      return this.replace(/::/g, '/')
                 .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
                 .replace(/([a-z\d])([A-Z])/g, '$1_$2')
                 .replace(/-/g, '_')
                 .toLowerCase();
    }
  
    function dasherize() {
      return this.replace(/_/g, '-');
    }
  
    function inspect(useDoubleQuotes) {
      var escapedString = this.replace(/[\x00-\x1f\\]/g, function(character) {
        if (character in String.specialChar) {
          return String.specialChar[character];
        }
        return '\\u00' + character.charCodeAt().toPaddedString(2, 16);
      });
      if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
      return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    }
  
    function unfilterJSON(filter) {
      return this.replace(filter || Prototype.JSONFilter, '$1');
    }
  
    function isJSON() {
      var str = this;
      if (str.blank()) return false;
      str = str.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@');
      str = str.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
      str = str.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
      return (/^[\],:{}\s]*$/).test(str);
    }
  
    function evalJSON(sanitize) {
      var json = this.unfilterJSON(),
          cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
      if (cx.test(json)) {
        json = json.replace(cx, function (a) {
          return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
        });
      }
      try {
        if (!sanitize || json.isJSON()) return eval('(' + json + ')');
      } catch (e) { }
      throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
    }
  
    function parseJSON() {
      var json = this.unfilterJSON();
      return JSON.parse(json);
    }
  
    function include(pattern) {
      return this.indexOf(pattern) > -1;
    }
  
    function startsWith(pattern, position) {
      position = Object.isNumber(position) ? position : 0;
      return this.lastIndexOf(pattern, position) === position;
    }
  
    function endsWith(pattern, position) {
      pattern = String(pattern);
      position = Object.isNumber(position) ? position : this.length;
      if (position < 0) position = 0;
      if (position > this.length) position = this.length;
      var d = position - pattern.length;
      return d >= 0 && this.indexOf(pattern, d) === d;
    }
  
    function empty() {
      return this == '';
    }
  
    function blank() {
      return /^\s*$/.test(this);
    }
  
    function interpolate(object, pattern) {
      return new Template(this, pattern).evaluate(object);
    }
  
    return {
      gsub:           gsub,
      sub:            sub,
      scan:           scan,
      truncate:       truncate,
      strip:          String.prototype.trim || strip,
      stripTags:      stripTags,
      stripScripts:   stripScripts,
      extractScripts: extractScripts,
      evalScripts:    evalScripts,
      escapeHTML:     escapeHTML,
      unescapeHTML:   unescapeHTML,
      toQueryParams:  toQueryParams,
      parseQuery:     toQueryParams,
      toArray:        toArray,
      succ:           succ,
      times:          times,
      camelize:       camelize,
      capitalize:     capitalize,
      underscore:     underscore,
      dasherize:      dasherize,
      inspect:        inspect,
      unfilterJSON:   unfilterJSON,
      isJSON:         isJSON,
      evalJSON:       NATIVE_JSON_PARSE_SUPPORT ? parseJSON : evalJSON,
      include:        include,
      startsWith:     String.prototype.startsWith || startsWith,
      endsWith:       String.prototype.endsWith || endsWith,
      empty:          empty,
      blank:          blank,
      interpolate:    interpolate
    };
  })());
  
  var Template = Class.create({
    initialize: function(template, pattern) {
      this.template = template.toString();
      this.pattern = pattern || Template.Pattern;
    },
  
    evaluate: function(object) {
      if (object && Object.isFunction(object.toTemplateReplacements))
        object = object.toTemplateReplacements();
  
      return this.template.gsub(this.pattern, function(match) {
        if (object == null) return (match[1] + '');
  
        var before = match[1] || '';
        if (before == '\\') return match[2];
  
        var ctx = object, expr = match[3],
            pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
  
        match = pattern.exec(expr);
        if (match == null) return before;
  
        while (match != null) {
          var comp = match[1].startsWith('[') ? match[2].replace(/\\\\]/g, ']') : 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);
      });
    }
  });
  Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
  
  var $break = { };
  
  var Enumerable = (function() {
    function each(iterator, context) {
      try {
        this._each(iterator, context);
      } catch (e) {
        if (e != $break) throw e;
      }
      return this;
    }
  
    function eachSlice(number, iterator, context) {
      var index = -number, slices = [], array = this.toArray();
      if (number < 1) return array;
      while ((index += number) < array.length)
        slices.push(array.slice(index, index+number));
      return slices.collect(iterator, context);
    }
  
    function all(iterator, context) {
      iterator = iterator || Prototype.K;
      var result = true;
      this.each(function(value, index) {
        result = result && !!iterator.call(context, value, index, this);
        if (!result) throw $break;
      }, this);
      return result;
    }
  
    function any(iterator, context) {
      iterator = iterator || Prototype.K;
      var result = false;
      this.each(function(value, index) {
        if (result = !!iterator.call(context, value, index, this))
          throw $break;
      }, this);
      return result;
    }
  
    function collect(iterator, context) {
      iterator = iterator || Prototype.K;
      var results = [];
      this.each(function(value, index) {
        results.push(iterator.call(context, value, index, this));
      }, this);
      return results;
    }
  
    function detect(iterator, context) {
      var result;
      this.each(function(value, index) {
        if (iterator.call(context, value, index, this)) {
          result = value;
          throw $break;
        }
      }, this);
      return result;
    }
  
    function findAll(iterator, context) {
      var results = [];
      this.each(function(value, index) {
        if (iterator.call(context, value, index, this))
          results.push(value);
      }, this);
      return results;
    }
  
    function grep(filter, iterator, context) {
      iterator = iterator || Prototype.K;
      var results = [];
  
      if (Object.isString(filter))
        filter = new RegExp(RegExp.escape(filter));
  
      this.each(function(value, index) {
        if (filter.match(value))
          results.push(iterator.call(context, value, index, this));
      }, this);
      return results;
    }
  
    function include(object) {
      if (Object.isFunction(this.indexOf) && this.indexOf(object) != -1)
        return true;
  
      var found = false;
      this.each(function(value) {
        if (value == object) {
          found = true;
          throw $break;
        }
      });
      return found;
    }
  
    function inGroupsOf(number, fillWith) {
      fillWith = Object.isUndefined(fillWith) ? null : fillWith;
      return this.eachSlice(number, function(slice) {
        while(slice.length < number) slice.push(fillWith);
        return slice;
      });
    }
  
    function inject(memo, iterator, context) {
      this.each(function(value, index) {
        memo = iterator.call(context, memo, value, index, this);
      }, this);
      return memo;
    }
  
    function invoke(method) {
      var args = $A(arguments).slice(1);
      return this.map(function(value) {
        return value[method].apply(value, args);
      });
    }
  
    function max(iterator, context) {
      iterator = iterator || Prototype.K;
      var result;
      this.each(function(value, index) {
        value = iterator.call(context, value, index, this);
        if (result == null || value >= result)
          result = value;
      }, this);
      return result;
    }
  
    function min(iterator, context) {
      iterator = iterator || Prototype.K;
      var result;
      this.each(function(value, index) {
        value = iterator.call(context, value, index, this);
        if (result == null || value < result)
          result = value;
      }, this);
      return result;
    }
  
    function partition(iterator, context) {
      iterator = iterator || Prototype.K;
      var trues = [], falses = [];
      this.each(function(value, index) {
        (iterator.call(context, value, index, this) ?
          trues : falses).push(value);
      }, this);
      return [trues, falses];
    }
  
    function pluck(property) {
      var results = [];
      this.each(function(value) {
        results.push(value[property]);
      });
      return results;
    }
  
    function reject(iterator, context) {
      var results = [];
      this.each(function(value, index) {
        if (!iterator.call(context, value, index, this))
          results.push(value);
      }, this);
      return results;
    }
  
    function sortBy(iterator, context) {
      return this.map(function(value, index) {
        return {
          value: value,
          criteria: iterator.call(context, value, index, this)
        };
      }, this).sort(function(left, right) {
        var a = left.criteria, b = right.criteria;
        return a < b ? -1 : a > b ? 1 : 0;
      }).pluck('value');
    }
  
    function toArray() {
      return this.map();
    }
  
    function zip() {
      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));
      });
    }
  
    function size() {
      return this.toArray().length;
    }
  
    function inspect() {
      return '#<Enumerable:' + this.toArray().inspect() + '>';
    }
  
  
  
  
  
  
  
  
  
    return {
      each:       each,
      eachSlice:  eachSlice,
      all:        all,
      every:      all,
      any:        any,
      some:       any,
      collect:    collect,
      map:        collect,
      detect:     detect,
      findAll:    findAll,
      select:     findAll,
      filter:     findAll,
      grep:       grep,
      include:    include,
      member:     include,
      inGroupsOf: inGroupsOf,
      inject:     inject,
      invoke:     invoke,
      max:        max,
      min:        min,
      partition:  partition,
      pluck:      pluck,
      reject:     reject,
      sortBy:     sortBy,
      toArray:    toArray,
      entries:    toArray,
      zip:        zip,
      size:       size,
      inspect:    inspect,
      find:       detect
    };
  })();
  
  function $A(iterable) {
    if (!iterable) return [];
    if ('toArray' in Object(iterable)) return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
  }
  
  
  function $w(string) {
    if (!Object.isString(string)) return [];
    string = string.strip();
    return string ? string.split(/\s+/) : [];
  }
  
  Array.from = $A;
  
  
  (function() {
    var arrayProto = Array.prototype,
        slice = arrayProto.slice,
        _each = arrayProto.forEach; // use native browser JS 1.6 implementation if available
  
    function each(iterator, context) {
      for (var i = 0, length = this.length >>> 0; i < length; i++) {
        if (i in this) iterator.call(context, this[i], i, this);
      }
    }
    if (!_each) _each = each;
  
    function clear() {
      this.length = 0;
      return this;
    }
  
    function first() {
      return this[0];
    }
  
    function last() {
      return this[this.length - 1];
    }
  
    function compact() {
      return this.select(function(value) {
        return value != null;
      });
    }
  
    function flatten() {
      return this.inject([], function(array, value) {
        if (Object.isArray(value))
          return array.concat(value.flatten());
        array.push(value);
        return array;
      });
    }
  
    function without() {
      var values = slice.call(arguments, 0);
      return this.select(function(value) {
        return !values.include(value);
      });
    }
  
    function reverse(inline) {
      return (inline === false ? this.toArray() : this)._reverse();
    }
  
    function uniq(sorted) {
      return this.inject([], function(array, value, index) {
        if (0 == index || (sorted ? array.last() != value : !array.include(value)))
          array.push(value);
        return array;
      });
    }
  
    function intersect(array) {
      return this.uniq().findAll(function(item) {
        return array.indexOf(item) !== -1;
      });
    }
  
  
    function clone() {
      return slice.call(this, 0);
    }
  
    function size() {
      return this.length;
    }
  
    function inspect() {
      return '[' + this.map(Object.inspect).join(', ') + ']';
    }
  
    function indexOf(item, i) {
      if (this == null) throw new TypeError();
  
      var array = Object(this), length = array.length >>> 0;
      if (length === 0) return -1;
  
      i = Number(i);
      if (isNaN(i)) {
        i = 0;
      } else if (i !== 0 && isFinite(i)) {
        i = (i > 0 ? 1 : -1) * Math.floor(Math.abs(i));
      }
  
      if (i > length) return -1;
  
      var k = i >= 0 ? i : Math.max(length - Math.abs(i), 0);
      for (; k < length; k++)
        if (k in array && array[k] === item) return k;
      return -1;
    }
  
  
    function lastIndexOf(item, i) {
      if (this == null) throw new TypeError();
  
      var array = Object(this), length = array.length >>> 0;
      if (length === 0) return -1;
  
      if (!Object.isUndefined(i)) {
        i = Number(i);
        if (isNaN(i)) {
          i = 0;
        } else if (i !== 0 && isFinite(i)) {
          i = (i > 0 ? 1 : -1) * Math.floor(Math.abs(i));
        }
      } else {
        i = length;
      }
  
      var k = i >= 0 ? Math.min(i, length - 1) :
       length - Math.abs(i);
  
      for (; k >= 0; k--)
        if (k in array && array[k] === item) return k;
      return -1;
    }
  
    function concat(_) {
      var array = [], items = slice.call(arguments, 0), item, n = 0;
      items.unshift(this);
      for (var i = 0, length = items.length; i < length; i++) {
        item = items[i];
        if (Object.isArray(item) && !('callee' in item)) {
          for (var j = 0, arrayLength = item.length; j < arrayLength; j++) {
            if (j in item) array[n] = item[j];
            n++;
          }
        } else {
          array[n++] = item;
        }
      }
      array.length = n;
      return array;
    }
  
  
    function wrapNative(method) {
      return function() {
        if (arguments.length === 0) {
          return method.call(this, Prototype.K);
        } else if (arguments[0] === undefined) {
          var args = slice.call(arguments, 1);
          args.unshift(Prototype.K);
          return method.apply(this, args);
        } else {
          return method.apply(this, arguments);
        }
      };
    }
  
  
    function map(iterator) {
      if (this == null) throw new TypeError();
      iterator = iterator || Prototype.K;
  
      var object = Object(this);
      var results = [], context = arguments[1], n = 0;
  
      for (var i = 0, length = object.length >>> 0; i < length; i++) {
        if (i in object) {
          results[n] = iterator.call(context, object[i], i, object);
        }
        n++;
      }
      results.length = n;
      return results;
    }
  
    if (arrayProto.map) {
      map = wrapNative(Array.prototype.map);
    }
  
    function filter(iterator) {
      if (this == null || !Object.isFunction(iterator))
        throw new TypeError();
  
      var object = Object(this);
      var results = [], context = arguments[1], value;
  
      for (var i = 0, length = object.length >>> 0; i < length; i++) {
        if (i in object) {
          value = object[i];
          if (iterator.call(context, value, i, object)) {
            results.push(value);
          }
        }
      }
      return results;
    }
  
    if (arrayProto.filter) {
      filter = Array.prototype.filter;
    }
  
    function some(iterator) {
      if (this == null) throw new TypeError();
      iterator = iterator || Prototype.K;
      var context = arguments[1];
  
      var object = Object(this);
      for (var i = 0, length = object.length >>> 0; i < length; i++) {
        if (i in object && iterator.call(context, object[i], i, object)) {
          return true;
        }
      }
  
      return false;
    }
  
    if (arrayProto.some) {
      var some = wrapNative(Array.prototype.some);
    }
  
  
    function every(iterator) {
      if (this == null) throw new TypeError();
      iterator = iterator || Prototype.K;
      var context = arguments[1];
  
      var object = Object(this);
      for (var i = 0, length = object.length >>> 0; i < length; i++) {
        if (i in object && !iterator.call(context, object[i], i, object)) {
          return false;
        }
      }
  
      return true;
    }
  
    if (arrayProto.every) {
      var every = wrapNative(Array.prototype.every);
    }
  
    var _reduce = arrayProto.reduce;
    function inject(memo, iterator) {
      iterator = iterator || Prototype.K;
      var context = arguments[2];
      return _reduce.call(this, iterator.bind(context), memo);
    }
  
    if (!arrayProto.reduce) {
      var inject = Enumerable.inject;
    }
  
    Object.extend(arrayProto, Enumerable);
  
    if (!arrayProto._reverse)
      arrayProto._reverse = arrayProto.reverse;
  
    Object.extend(arrayProto, {
      _each:     _each,
  
      map:       map,
      collect:   map,
      select:    filter,
      filter:    filter,
      findAll:   filter,
      some:      some,
      any:       some,
      every:     every,
      all:       every,
      inject:    inject,
  
      clear:     clear,
      first:     first,
      last:      last,
      compact:   compact,
      flatten:   flatten,
      without:   without,
      reverse:   reverse,
      uniq:      uniq,
      intersect: intersect,
      clone:     clone,
      toArray:   clone,
      size:      size,
      inspect:   inspect
    });
  
    var CONCAT_ARGUMENTS_BUGGY = (function() {
      return [].concat(arguments)[0][0] !== 1;
    })(1,2);
  
    if (CONCAT_ARGUMENTS_BUGGY) arrayProto.concat = concat;
  
    if (!arrayProto.indexOf) arrayProto.indexOf = indexOf;
    if (!arrayProto.lastIndexOf) arrayProto.lastIndexOf = lastIndexOf;
  })();
  function $H(object) {
    return new Hash(object);
  };
  
  var Hash = Class.create(Enumerable, (function() {
    function initialize(object) {
      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    }
  
  
    function _each(iterator, context) {
      var i = 0;
      for (var key in this._object) {
        var value = this._object[key], pair = [key, value];
        pair.key = key;
        pair.value = value;
        iterator.call(context, pair, i);
        i++;
      }
    }
  
    function set(key, value) {
      return this._object[key] = value;
    }
  
    function get(key) {
      if (this._object[key] !== Object.prototype[key])
        return this._object[key];
    }
  
    function unset(key) {
      var value = this._object[key];
      delete this._object[key];
      return value;
    }
  
    function toObject() {
      return Object.clone(this._object);
    }
  
  
  
    function keys() {
      return this.pluck('key');
    }
  
    function values() {
      return this.pluck('value');
    }
  
    function index(value) {
      var match = this.detect(function(pair) {
        return pair.value === value;
      });
      return match && match.key;
    }
  
    function merge(object) {
      return this.clone().update(object);
    }
  
    function update(object) {
      return new Hash(object).inject(this, function(result, pair) {
        result.set(pair.key, pair.value);
        return result;
      });
    }
  
    function toQueryPair(key, value) {
      if (Object.isUndefined(value)) return key;
  
      value = String.interpret(value);
  
      value = value.gsub(/(\r)?\n/, '\r\n');
      value = encodeURIComponent(value);
      value = value.gsub(/%20/, '+');
      return key + '=' + value;
    }
  
    function toQueryString() {
      return this.inject([], function(results, pair) {
        var key = encodeURIComponent(pair.key), values = pair.value;
  
        if (values && typeof values == 'object') {
          if (Object.isArray(values)) {
            var queryValues = [];
            for (var i = 0, len = values.length, value; i < len; i++) {
              value = values[i];
              queryValues.push(toQueryPair(key, value));
            }
            return results.concat(queryValues);
          }
        } else results.push(toQueryPair(key, values));
        return results;
      }).join('&');
    }
  
    function inspect() {
      return '#<Hash:{' + this.map(function(pair) {
        return pair.map(Object.inspect).join(': ');
      }).join(', ') + '}>';
    }
  
    function clone() {
      return new Hash(this);
    }
  
    return {
      initialize:             initialize,
      _each:                  _each,
      set:                    set,
      get:                    get,
      unset:                  unset,
      toObject:               toObject,
      toTemplateReplacements: toObject,
      keys:                   keys,
      values:                 values,
      index:                  index,
      merge:                  merge,
      update:                 update,
      toQueryString:          toQueryString,
      inspect:                inspect,
      toJSON:                 toObject,
      clone:                  clone
    };
  })());
  
  Hash.from = $H;
  Object.extend(Number.prototype, (function() {
    function toColorPart() {
      return this.toPaddedString(2, 16);
    }
  
    function succ() {
      return this + 1;
    }
  
    function times(iterator, context) {
      $R(0, this, true).each(iterator, context);
      return this;
    }
  
    function toPaddedString(length, radix) {
      var string = this.toString(radix || 10);
      return '0'.times(length - string.length) + string;
    }
  
    function abs() {
      return Math.abs(this);
    }
  
    function round() {
      return Math.round(this);
    }
  
    function ceil() {
      return Math.ceil(this);
    }
  
    function floor() {
      return Math.floor(this);
    }
  
    return {
      toColorPart:    toColorPart,
      succ:           succ,
      times:          times,
      toPaddedString: toPaddedString,
      abs:            abs,
      round:          round,
      ceil:           ceil,
      floor:          floor
    };
  })());
  
  function $R(start, end, exclusive) {
    return new ObjectRange(start, end, exclusive);
  }
  
  var ObjectRange = Class.create(Enumerable, (function() {
    function initialize(start, end, exclusive) {
      this.start = start;
      this.end = end;
      this.exclusive = exclusive;
    }
  
    function _each(iterator, context) {
      var value = this.start, i;
      for (i = 0; this.include(value); i++) {
        iterator.call(context, value, i);
        value = value.succ();
      }
    }
  
    function include(value) {
      if (value < this.start)
        return false;
      if (this.exclusive)
        return value < this.end;
      return value <= this.end;
    }
  
    return {
      initialize: initialize,
      _each:      _each,
      include:    include
    };
  })());
  
  
  
  var Abstract = { };
  
  
  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;
    }
  };
  
  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, context) {
      this.responders._each(iterator, context);
    },
  
    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.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.isString(this.options.parameters) ?
            this.options.parameters :
            Object.toQueryString(this.options.parameters);
  
      if (!['get', 'post'].include(this.method)) {
        params += (params ? '&' : '') + "_method=" + this.method;
        this.method = 'post';
      }
  
      if (params && this.method === 'get') {
        this.url += (this.url.include('?') ? '&' : '?') + params;
      }
  
      this.parameters = params.toQueryParams();
  
      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';
      }
  
      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)
        if (headers[name] != null)
          this.transport.setRequestHeader(name, headers[name]);
    },
  
    success: function() {
      var status = this.getStatus();
      return !status || (status >= 200 && status < 300) || status == 304;
    },
  
    getStatus: function() {
      try {
        if (this.transport.status === 1223) return 204;
        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 && this.isSameOrigin() && 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') {
        this.transport.onreadystatechange = Prototype.emptyFunction;
      }
    },
  
    isSameOrigin: function() {
      var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
      return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
        protocol: location.protocol,
        domain: document.domain,
        port: location.port ? ':' + location.port : ''
      }));
    },
  
    getHeader: function(name) {
      try {
        return this.transport.getResponseHeader(name) || null;
      } 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;
  
      try {
        json = decodeURIComponent(escape(json));
      } catch(e) {
      }
  
      try {
        return json.evalJSON(this.request.options.sanitizeJSON ||
          !this.request.isSameOrigin());
      } 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 ||
          !this.request.isSameOrigin());
      } 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(GLOBAL) {
  
    var UNDEFINED;
    var SLICE = Array.prototype.slice;
  
    var DIV = document.createElement('div');
  
  
    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);
    }
  
    GLOBAL.$ = $;
  
  
    if (!GLOBAL.Node) GLOBAL.Node = {};
  
    if (!GLOBAL.Node.ELEMENT_NODE) {
      Object.extend(GLOBAL.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
      });
    }
  
    var ELEMENT_CACHE = {};
  
    function shouldUseCreationCache(tagName, attributes) {
      if (tagName === 'select') return false;
      if ('type' in attributes) return false;
      return true;
    }
  
    var HAS_EXTENDED_CREATE_ELEMENT_SYNTAX = (function(){
      try {
        var el = document.createElement('<input name="x">');
        return el.tagName.toLowerCase() === 'input' && el.name === 'x';
      }
      catch(err) {
        return false;
      }
    })();
  
  
    var oldElement = GLOBAL.Element;
    function Element(tagName, attributes) {
      attributes = attributes || {};
      tagName = tagName.toLowerCase();
  
      if (HAS_EXTENDED_CREATE_ELEMENT_SYNTAX && attributes.name) {
        tagName = '<' + tagName + ' name="' + attributes.name + '">';
        delete attributes.name;
        return Element.writeAttribute(document.createElement(tagName), attributes);
      }
  
      if (!ELEMENT_CACHE[tagName])
        ELEMENT_CACHE[tagName] = Element.extend(document.createElement(tagName));
  
      var node = shouldUseCreationCache(tagName, attributes) ?
       ELEMENT_CACHE[tagName].cloneNode(false) : document.createElement(tagName);
  
      return Element.writeAttribute(node, attributes);
    }
  
    GLOBAL.Element = Element;
  
    Object.extend(GLOBAL.Element, oldElement || {});
    if (oldElement) GLOBAL.Element.prototype = oldElement.prototype;
  
    Element.Methods = { ByTag: {}, Simulated: {} };
  
    var methods = {};
  
    var INSPECT_ATTRIBUTES = { id: 'id', className: 'class' };
    function inspect(element) {
      element = $(element);
      var result = '<' + element.tagName.toLowerCase();
  
      var attribute, value;
      for (var property in INSPECT_ATTRIBUTES) {
        attribute = INSPECT_ATTRIBUTES[property];
        value = (element[property] || '').toString();
        if (value) result += ' ' + attribute + '=' + value.inspect(true);
      }
  
      return result + '>';
    }
  
    methods.inspect = inspect;
  
  
    function visible(element) {
      return $(element).style.display !== 'none';
    }
  
    function toggle(element, bool) {
      element = $(element);
      if (Object.isUndefined(bool))
        bool = !Element.visible(element);
      Element[bool ? 'show' : 'hide'](element);
  
      return element;
    }
  
    function hide(element) {
      element = $(element);
      element.style.display = 'none';
      return element;
    }
  
    function show(element) {
      element = $(element);
      element.style.display = '';
      return element;
    }
  
  
    Object.extend(methods, {
      visible: visible,
      toggle:  toggle,
      hide:    hide,
      show:    show
    });
  
  
    function remove(element) {
      element = $(element);
      element.parentNode.removeChild(element);
      return element;
    }
  
    var SELECT_ELEMENT_INNERHTML_BUGGY = (function(){
      var el = document.createElement("select"),
          isBuggy = true;
      el.innerHTML = "<option value=\"test\">test</option>";
      if (el.options && el.options[0]) {
        isBuggy = el.options[0].nodeName.toUpperCase() !== "OPTION";
      }
      el = null;
      return isBuggy;
    })();
  
    var TABLE_ELEMENT_INNERHTML_BUGGY = (function(){
      try {
        var el = document.createElement("table");
        if (el && el.tBodies) {
          el.innerHTML = "<tbody><tr><td>test</td></tr></tbody>";
          var isBuggy = typeof el.tBodies[0] == "undefined";
          el = null;
          return isBuggy;
        }
      } catch (e) {
        return true;
      }
    })();
  
    var LINK_ELEMENT_INNERHTML_BUGGY = (function() {
      try {
        var el = document.createElement('div');
        el.innerHTML = "<link />";
        var isBuggy = (el.childNodes.length === 0);
        el = null;
        return isBuggy;
      } catch(e) {
        return true;
      }
    })();
  
    var ANY_INNERHTML_BUGGY = SELECT_ELEMENT_INNERHTML_BUGGY ||
     TABLE_ELEMENT_INNERHTML_BUGGY || LINK_ELEMENT_INNERHTML_BUGGY;
  
    var SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING = (function () {
      var s = document.createElement("script"),
          isBuggy = false;
      try {
        s.appendChild(document.createTextNode(""));
        isBuggy = !s.firstChild ||
          s.firstChild && s.firstChild.nodeType !== 3;
      } catch (e) {
        isBuggy = true;
      }
      s = null;
      return isBuggy;
    })();
  
    function update(element, content) {
      element = $(element);
  
      var descendants = element.getElementsByTagName('*'),
       i = descendants.length;
      while (i--) purgeElement(descendants[i]);
  
      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 === 'SCRIPT' && SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING) {
        element.text = content;
        return element;
      }
  
      if (ANY_INNERHTML_BUGGY) {
        if (tagName in INSERTION_TRANSLATIONS.tags) {
          while (element.firstChild)
            element.removeChild(element.firstChild);
  
          var nodes = getContentFromAnonymousElement(tagName, content.stripScripts());
          for (var i = 0, node; node = nodes[i]; i++)
            element.appendChild(node);
  
        } else if (LINK_ELEMENT_INNERHTML_BUGGY && Object.isString(content) && content.indexOf('<link') > -1) {
          while (element.firstChild)
            element.removeChild(element.firstChild);
  
          var nodes = getContentFromAnonymousElement(tagName,
           content.stripScripts(), true);
  
          for (var i = 0, node; node = nodes[i]; i++)
            element.appendChild(node);
        } else {
          element.innerHTML = content.stripScripts();
        }
      } else {
        element.innerHTML = content.stripScripts();
      }
  
      content.evalScripts.bind(content).defer();
      return element;
    }
  
    function replace(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;
    }
  
    var INSERTION_TRANSLATIONS = {
      before: function(element, node) {
        element.parentNode.insertBefore(node, element);
      },
      top: function(element, node) {
        element.insertBefore(node, element.firstChild);
      },
      bottom: function(element, node) {
        element.appendChild(node);
      },
      after: function(element, node) {
        element.parentNode.insertBefore(node, element.nextSibling);
      },
  
      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]
      }
    };
  
    var tags = INSERTION_TRANSLATIONS.tags;
  
    Object.extend(tags, {
      THEAD: tags.TBODY,
      TFOOT: tags.TBODY,
      TH:    tags.TD
    });
  
    function replace_IE(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 (tagName in INSERTION_TRANSLATIONS.tags) {
        var nextSibling = Element.next(element);
        var fragments = getContentFromAnonymousElement(
         tagName, content.stripScripts());
  
        parent.removeChild(element);
  
        var iterator;
        if (nextSibling)
          iterator = function(node) { parent.insertBefore(node, nextSibling) };
        else
          iterator = function(node) { parent.appendChild(node); }
  
        fragments.each(iterator);
      } else {
        element.outerHTML = content.stripScripts();
      }
  
      content.evalScripts.bind(content).defer();
      return element;
    }
  
    if ('outerHTML' in document.documentElement)
      replace = replace_IE;
  
    function isContent(content) {
      if (Object.isUndefined(content) || content === null) return false;
  
      if (Object.isString(content) || Object.isNumber(content)) return true;
      if (Object.isElement(content)) return true;
      if (content.toElement || content.toHTML) return true;
  
      return false;
    }
  
    function insertContentAt(element, content, position) {
      position   = position.toLowerCase();
      var method = INSERTION_TRANSLATIONS[position];
  
      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) {
        method(element, content);
        return element;
      }
  
      content = Object.toHTML(content);
      var tagName = ((position === 'before' || position === 'after') ?
       element.parentNode : element).tagName.toUpperCase();
  
      var childNodes = getContentFromAnonymousElement(tagName, content.stripScripts());
  
      if (position === 'top' || position === 'after') childNodes.reverse();
  
      for (var i = 0, node; node = childNodes[i]; i++)
        method(element, node);
  
      content.evalScripts.bind(content).defer();
    }
  
    function insert(element, insertions) {
      element = $(element);
  
      if (isContent(insertions))
        insertions = { bottom: insertions };
  
      for (var position in insertions)
        insertContentAt(element, insertions[position], position);
  
      return element;
    }
  
    function wrap(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;
    }
  
    function cleanWhitespace(element) {
      element = $(element);
      var node = element.firstChild;
  
      while (node) {
        var nextNode = node.nextSibling;
        if (node.nodeType === Node.TEXT_NODE && !/\S/.test(node.nodeValue))
          element.removeChild(node);
        node = nextNode;
      }
      return element;
    }
  
    function empty(element) {
      return $(element).innerHTML.blank();
    }
  
    function getContentFromAnonymousElement(tagName, html, force) {
      var t = INSERTION_TRANSLATIONS.tags[tagName], div = DIV;
  
      var workaround = !!t;
      if (!workaround && force) {
        workaround = true;
        t = ['', '', 0];
      }
  
      if (workaround) {
        div.innerHTML = '&#160;' + t[0] + html + t[1];
        div.removeChild(div.firstChild);
        for (var i = t[2]; i--; )
          div = div.firstChild;
      } else {
        div.innerHTML = html;
      }
  
      return $A(div.childNodes);
    }
  
    function clone(element, deep) {
      if (!(element = $(element))) return;
      var clone = element.cloneNode(deep);
      if (!HAS_UNIQUE_ID_PROPERTY) {
        clone._prototypeUID = UNDEFINED;
        if (deep) {
          var descendants = Element.select(clone, '*'),
           i = descendants.length;
          while (i--)
            descendants[i]._prototypeUID = UNDEFINED;
        }
      }
      return Element.extend(clone);
    }
  
    function purgeElement(element) {
      var uid = getUniqueElementID(element);
      if (uid) {
        Element.stopObserving(element);
        if (!HAS_UNIQUE_ID_PROPERTY)
          element._prototypeUID = UNDEFINED;
        delete Element.Storage[uid];
      }
    }
  
    function purgeCollection(elements) {
      var i = elements.length;
      while (i--)
        purgeElement(elements[i]);
    }
  
    function purgeCollection_IE(elements) {
      var i = elements.length, element, uid;
      while (i--) {
        element = elements[i];
        uid = getUniqueElementID(element);
        delete Element.Storage[uid];
        delete Event.cache[uid];
      }
    }
  
    if (HAS_UNIQUE_ID_PROPERTY) {
      purgeCollection = purgeCollection_IE;
    }
  
  
    function purge(element) {
      if (!(element = $(element))) return;
      purgeElement(element);
  
      var descendants = element.getElementsByTagName('*'),
       i = descendants.length;
  
      while (i--) purgeElement(descendants[i]);
  
      return null;
    }
  
    Object.extend(methods, {
      remove:  remove,
      update:  update,
      replace: replace,
      insert:  insert,
      wrap:    wrap,
      cleanWhitespace: cleanWhitespace,
      empty:   empty,
      clone:   clone,
      purge:   purge
    });
  
  
  
    function recursivelyCollect(element, property, maximumLength) {
      element = $(element);
      maximumLength = maximumLength || -1;
      var elements = [];
  
      while (element = element[property]) {
        if (element.nodeType === Node.ELEMENT_NODE)
          elements.push(Element.extend(element));
  
        if (elements.length === maximumLength) break;
      }
  
      return elements;
    }
  
  
    function ancestors(element) {
      return recursivelyCollect(element, 'parentNode');
    }
  
    function descendants(element) {
      return Element.select(element, '*');
    }
  
    function firstDescendant(element) {
      element = $(element).firstChild;
      while (element && element.nodeType !== Node.ELEMENT_NODE)
        element = element.nextSibling;
  
      return $(element);
    }
  
    function immediateDescendants(element) {
      var results = [], child = $(element).firstChild;
  
      while (child) {
        if (child.nodeType === Node.ELEMENT_NODE)
          results.push(Element.extend(child));
  
        child = child.nextSibling;
      }
  
      return results;
    }
  
    function previousSiblings(element) {
      return recursivelyCollect(element, 'previousSibling');
    }
  
    function nextSiblings(element) {
      return recursivelyCollect(element, 'nextSibling');
    }
  
    function siblings(element) {
      element = $(element);
      var previous = previousSiblings(element),
       next = nextSiblings(element);
      return previous.reverse().concat(next);
    }
  
    function match(element, selector) {
      element = $(element);
  
      if (Object.isString(selector))
        return Prototype.Selector.match(element, selector);
  
      return selector.match(element);
    }
  
  
    function _recursivelyFind(element, property, expression, index) {
      element = $(element), expression = expression || 0, index = index || 0;
      if (Object.isNumber(expression)) {
        index = expression, expression = null;
      }
  
      while (element = element[property]) {
        if (element.nodeType !== 1) continue;
        if (expression && !Prototype.Selector.match(element, expression))
          continue;
        if (--index >= 0) continue;
  
        return Element.extend(element);
      }
    }
  
  
    function up(element, expression, index) {
      element = $(element);
  
      if (arguments.length === 1) return $(element.parentNode);
      return _recursivelyFind(element, 'parentNode', expression, index);
    }
  
    function down(element, expression, index) {
      if (arguments.length === 1) return firstDescendant(element);
      element = $(element), expression = expression || 0, index = index || 0;
  
      if (Object.isNumber(expression))
        index = expression, expression = '*';
  
      var node = Prototype.Selector.select(expression, element)[index];
      return Element.extend(node);
    }
  
    function previous(element, expression, index) {
      return _recursivelyFind(element, 'previousSibling', expression, index);
    }
  
    function next(element, expression, index) {
      return _recursivelyFind(element, 'nextSibling', expression, index);
    }
  
    function select(element) {
      element = $(element);
      var expressions = SLICE.call(arguments, 1).join(', ');
      return Prototype.Selector.select(expressions, element);
    }
  
    function adjacent(element) {
      element = $(element);
      var expressions = SLICE.call(arguments, 1).join(', ');
      var siblings = Element.siblings(element), results = [];
      for (var i = 0, sibling; sibling = siblings[i]; i++) {
        if (Prototype.Selector.match(sibling, expressions))
          results.push(sibling);
      }
  
      return results;
    }
  
    function descendantOf_DOM(element, ancestor) {
      element = $(element), ancestor = $(ancestor);
      while (element = element.parentNode)
        if (element === ancestor) return true;
      return false;
    }
  
    function descendantOf_contains(element, ancestor) {
      element = $(element), ancestor = $(ancestor);
      if (!ancestor.contains) return descendantOf_DOM(element, ancestor);
      return ancestor.contains(element) && ancestor !== element;
    }
  
    function descendantOf_compareDocumentPosition(element, ancestor) {
      element = $(element), ancestor = $(ancestor);
      return (element.compareDocumentPosition(ancestor) & 8) === 8;
    }
  
    var descendantOf;
    if (DIV.compareDocumentPosition) {
      descendantOf = descendantOf_compareDocumentPosition;
    } else if (DIV.contains) {
      descendantOf = descendantOf_contains;
    } else {
      descendantOf = descendantOf_DOM;
    }
  
  
    Object.extend(methods, {
      recursivelyCollect:   recursivelyCollect,
      ancestors:            ancestors,
      descendants:          descendants,
      firstDescendant:      firstDescendant,
      immediateDescendants: immediateDescendants,
      previousSiblings:     previousSiblings,
      nextSiblings:         nextSiblings,
      siblings:             siblings,
      match:                match,
      up:                   up,
      down:                 down,
      previous:             previous,
      next:                 next,
      select:               select,
      adjacent:             adjacent,
      descendantOf:         descendantOf,
  
      getElementsBySelector: select,
  
      childElements:         immediateDescendants
    });
  
  
    var idCounter = 1;
    function identify(element) {
      element = $(element);
      var id = Element.readAttribute(element, 'id');
      if (id) return id;
  
      do { id = 'anonymous_element_' + idCounter++ } while ($(id));
  
      Element.writeAttribute(element, 'id', id);
      return id;
    }
  
  
    function readAttribute(element, name) {
      return $(element).getAttribute(name);
    }
  
    function readAttribute_IE(element, name) {
      element = $(element);
  
      var table = ATTRIBUTE_TRANSLATIONS.read;
      if (table.values[name])
        return table.values[name](element, name);
  
      if (table.names[name]) name = table.names[name];
  
      if (name.include(':')) {
        if (!element.attributes || !element.attributes[name]) return null;
        return element.attributes[name].value;
      }
  
      return element.getAttribute(name);
    }
  
    function readAttribute_Opera(element, name) {
      if (name === 'title') return element.title;
      return element.getAttribute(name);
    }
  
    var PROBLEMATIC_ATTRIBUTE_READING = (function() {
      DIV.setAttribute('onclick', []);
      var value = DIV.getAttribute('onclick');
      var isFunction = Object.isArray(value);
      DIV.removeAttribute('onclick');
      return isFunction;
    })();
  
    if (PROBLEMATIC_ATTRIBUTE_READING) {
      readAttribute = readAttribute_IE;
    } else if (Prototype.Browser.Opera) {
      readAttribute = readAttribute_Opera;
    }
  
  
    function writeAttribute(element, name, value) {
      element = $(element);
      var attributes = {}, table = ATTRIBUTE_TRANSLATIONS.write;
  
      if (typeof name === 'object') {
        attributes = name;
      } else {
        attributes[name] = Object.isUndefined(value) ? true : value;
      }
  
      for (var attr in attributes) {
        name = table.names[attr] || attr;
        value = attributes[attr];
        if (table.values[attr])
          name = table.values[attr](element, value) || name;
        if (value === false || value === null)
          element.removeAttribute(name);
        else if (value === true)
          element.setAttribute(name, name);
        else element.setAttribute(name, value);
      }
  
      return element;
    }
  
    var PROBLEMATIC_HAS_ATTRIBUTE_WITH_CHECKBOXES = (function () {
      if (!HAS_EXTENDED_CREATE_ELEMENT_SYNTAX) {
        return false;
      }
      var checkbox = document.createElement('<input type="checkbox">');
      checkbox.checked = true;
      var node = checkbox.getAttributeNode('checked');
      return !node || !node.specified;
    })();
  
    function hasAttribute(element, attribute) {
      attribute = ATTRIBUTE_TRANSLATIONS.has[attribute] || attribute;
      var node = $(element).getAttributeNode(attribute);
      return !!(node && node.specified);
    }
  
    function hasAttribute_IE(element, attribute) {
      if (attribute === 'checked') {
        return element.checked;
      }
      return hasAttribute(element, attribute);
    }
  
    GLOBAL.Element.Methods.Simulated.hasAttribute =
     PROBLEMATIC_HAS_ATTRIBUTE_WITH_CHECKBOXES ?
     hasAttribute_IE : hasAttribute;
  
    function classNames(element) {
      return new Element.ClassNames(element);
    }
  
    var regExpCache = {};
    function getRegExpForClassName(className) {
      if (regExpCache[className]) return regExpCache[className];
  
      var re = new RegExp("(^|\\s+)" + className + "(\\s+|$)");
      regExpCache[className] = re;
      return re;
    }
  
    function hasClassName(element, className) {
      if (!(element = $(element))) return;
  
      var elementClassName = element.className;
  
      if (elementClassName.length === 0) return false;
      if (elementClassName === className) return true;
  
      return getRegExpForClassName(className).test(elementClassName);
    }
  
    function addClassName(element, className) {
      if (!(element = $(element))) return;
  
      if (!hasClassName(element, className))
        element.className += (element.className ? ' ' : '') + className;
  
      return element;
    }
  
    function removeClassName(element, className) {
      if (!(element = $(element))) return;
  
      element.className = element.className.replace(
       getRegExpForClassName(className), ' ').strip();
  
      return element;
    }
  
    function toggleClassName(element, className, bool) {
      if (!(element = $(element))) return;
  
      if (Object.isUndefined(bool))
        bool = !hasClassName(element, className);
  
      var method = Element[bool ? 'addClassName' : 'removeClassName'];
      return method(element, className);
    }
  
    var ATTRIBUTE_TRANSLATIONS = {};
  
    var classProp = 'className', forProp = 'for';
  
    DIV.setAttribute(classProp, 'x');
    if (DIV.className !== 'x') {
      DIV.setAttribute('class', 'x');
      if (DIV.className === 'x')
        classProp = 'class';
    }
  
    var LABEL = document.createElement('label');
    LABEL.setAttribute(forProp, 'x');
    if (LABEL.htmlFor !== 'x') {
      LABEL.setAttribute('htmlFor', 'x');
      if (LABEL.htmlFor === 'x')
        forProp = 'htmlFor';
    }
    LABEL = null;
  
    function _getAttr(element, attribute) {
      return element.getAttribute(attribute);
    }
  
    function _getAttr2(element, attribute) {
      return element.getAttribute(attribute, 2);
    }
  
    function _getAttrNode(element, attribute) {
      var node = element.getAttributeNode(attribute);
      return node ? node.value : '';
    }
  
    function _getFlag(element, attribute) {
      return $(element).hasAttribute(attribute) ? attribute : null;
    }
  
    DIV.onclick = Prototype.emptyFunction;
    var onclickValue = DIV.getAttribute('onclick');
  
    var _getEv;
  
    if (String(onclickValue).indexOf('{') > -1) {
      _getEv = function(element, attribute) {
        var value = element.getAttribute(attribute);
        if (!value) return null;
        value = value.toString();
        value = value.split('{')[1];
        value = value.split('}')[0];
        return value.strip();
      };
    }
    else if (onclickValue === '') {
      _getEv = function(element, attribute) {
        var value = element.getAttribute(attribute);
        if (!value) return null;
        return value.strip();
      };
    }
  
    ATTRIBUTE_TRANSLATIONS.read = {
      names: {
        'class':     classProp,
        'className': classProp,
        'for':       forProp,
        'htmlFor':   forProp
      },
  
      values: {
        style: function(element) {
          return element.style.cssText.toLowerCase();
        },
        title: function(element) {
          return element.title;
        }
      }
    };
  
    ATTRIBUTE_TRANSLATIONS.write = {
      names: {
        className:   'class',
        htmlFor:     'for',
        cellpadding: 'cellPadding',
        cellspacing: 'cellSpacing'
      },
  
      values: {
        checked: function(element, value) {
          element.checked = !!value;
        },
  
        style: function(element, value) {
          element.style.cssText = value ? value : '';
        }
      }
    };
  
    ATTRIBUTE_TRANSLATIONS.has = { names: {} };
  
    Object.extend(ATTRIBUTE_TRANSLATIONS.write.names,
     ATTRIBUTE_TRANSLATIONS.read.names);
  
    var CAMEL_CASED_ATTRIBUTE_NAMES = $w('colSpan rowSpan vAlign dateTime ' +
     'accessKey tabIndex encType maxLength readOnly longDesc frameBorder');
  
    for (var i = 0, attr; attr = CAMEL_CASED_ATTRIBUTE_NAMES[i]; i++) {
      ATTRIBUTE_TRANSLATIONS.write.names[attr.toLowerCase()] = attr;
      ATTRIBUTE_TRANSLATIONS.has.names[attr.toLowerCase()]   = attr;
    }
  
    Object.extend(ATTRIBUTE_TRANSLATIONS.read.values, {
      href:        _getAttr2,
      src:         _getAttr2,
      type:        _getAttr,
      action:      _getAttrNode,
      disabled:    _getFlag,
      checked:     _getFlag,
      readonly:    _getFlag,
      multiple:    _getFlag,
      onload:      _getEv,
      onunload:    _getEv,
      onclick:     _getEv,
      ondblclick:  _getEv,
      onmousedown: _getEv,
      onmouseup:   _getEv,
      onmouseover: _getEv,
      onmousemove: _getEv,
      onmouseout:  _getEv,
      onfocus:     _getEv,
      onblur:      _getEv,
      onkeypress:  _getEv,
      onkeydown:   _getEv,
      onkeyup:     _getEv,
      onsubmit:    _getEv,
      onreset:     _getEv,
      onselect:    _getEv,
      onchange:    _getEv
    });
  
  
    Object.extend(methods, {
      identify:        identify,
      readAttribute:   readAttribute,
      writeAttribute:  writeAttribute,
      classNames:      classNames,
      hasClassName:    hasClassName,
      addClassName:    addClassName,
      removeClassName: removeClassName,
      toggleClassName: toggleClassName
    });
  
  
    function normalizeStyleName(style) {
      if (style === 'float' || style === 'styleFloat')
        return 'cssFloat';
      return style.camelize();
    }
  
    function normalizeStyleName_IE(style) {
      if (style === 'float' || style === 'cssFloat')
        return 'styleFloat';
      return style.camelize();
    }
  
    function setStyle(element, styles) {
      element = $(element);
      var elementStyle = element.style, match;
  
      if (Object.isString(styles)) {
        elementStyle.cssText += ';' + styles;
        if (styles.include('opacity')) {
          var opacity = styles.match(/opacity:\s*(\d?\.?\d*)/)[1];
          Element.setOpacity(element, opacity);
        }
        return element;
      }
  
      for (var property in styles) {
        if (property === 'opacity') {
          Element.setOpacity(element, styles[property]);
        } else {
          var value = styles[property];
          if (property === 'float' || property === 'cssFloat') {
            property = Object.isUndefined(elementStyle.styleFloat) ?
             'cssFloat' : 'styleFloat';
          }
          elementStyle[property] = value;
        }
      }
  
      return element;
    }
  
  
    function getStyle(element, style) {
      element = $(element);
      style = normalizeStyleName(style);
  
      var value = element.style[style];
      if (!value || value === 'auto') {
        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;
    }
  
    function getStyle_Opera(element, style) {
      switch (style) {
        case 'height': case 'width':
          if (!Element.visible(element)) return null;
  
          var dim = parseInt(getStyle(element, style), 10);
  
          if (dim !== element['offset' + style.capitalize()])
            return dim + 'px';
  
          return Element.measure(element, style);
  
        default: return getStyle(element, style);
      }
    }
  
    function getStyle_IE(element, style) {
      element = $(element);
      style = normalizeStyleName_IE(style);
  
      var value = element.style[style];
      if (!value && element.currentStyle) {
        value = element.currentStyle[style];
      }
  
      if (style === 'opacity' && !STANDARD_CSS_OPACITY_SUPPORTED)
        return getOpacity_IE(element);
  
      if (value === 'auto') {
        if ((style === 'width' || style === 'height') && Element.visible(element))
          return Element.measure(element, style) + 'px';
        return null;
      }
  
      return value;
    }
  
    function stripAlphaFromFilter_IE(filter) {
      return (filter || '').replace(/alpha\([^\)]*\)/gi, '');
    }
  
    function hasLayout_IE(element) {
      if (!element.currentStyle || !element.currentStyle.hasLayout)
        element.style.zoom = 1;
      return element;
    }
  
    var STANDARD_CSS_OPACITY_SUPPORTED = (function() {
      DIV.style.cssText = "opacity:.55";
      return /^0.55/.test(DIV.style.opacity);
    })();
  
    function setOpacity(element, value) {
      element = $(element);
      if (value == 1 || value === '') value = '';
      else if (value < 0.00001) value = 0;
      element.style.opacity = value;
      return element;
    }
  
    function setOpacity_IE(element, value) {
      if (STANDARD_CSS_OPACITY_SUPPORTED)
        return setOpacity(element, value);
  
      element = hasLayout_IE($(element));
      var filter = Element.getStyle(element, 'filter'),
       style = element.style;
  
      if (value == 1 || value === '') {
        filter = stripAlphaFromFilter_IE(filter);
        if (filter) style.filter = filter;
        else style.removeAttribute('filter');
        return element;
      }
  
      if (value < 0.00001) value = 0;
  
      style.filter = stripAlphaFromFilter_IE(filter) +
       'alpha(opacity=' + (value * 100) + ')';
  
      return element;
    }
  
  
    function getOpacity(element) {
      return Element.getStyle(element, 'opacity');
    }
  
    function getOpacity_IE(element) {
      if (STANDARD_CSS_OPACITY_SUPPORTED)
        return getOpacity(element);
  
      var filter = Element.getStyle(element, 'filter');
      if (filter.length === 0) return 1.0;
      var match = (filter || '').match(/alpha\(opacity=(.*)\)/);
      if (match && match[1]) return parseFloat(match[1]) / 100;
      return 1.0;
    }
  
  
    Object.extend(methods, {
      setStyle:   setStyle,
      getStyle:   getStyle,
      setOpacity: setOpacity,
      getOpacity: getOpacity
    });
  
    if ('styleFloat' in DIV.style) {
      methods.getStyle = getStyle_IE;
      methods.setOpacity = setOpacity_IE;
      methods.getOpacity = getOpacity_IE;
    }
  
    var UID = 0;
  
    GLOBAL.Element.Storage = { UID: 1 };
  
    function getUniqueElementID(element) {
      if (element === window) return 0;
  
      if (typeof element._prototypeUID === 'undefined')
        element._prototypeUID = Element.Storage.UID++;
      return element._prototypeUID;
    }
  
    function getUniqueElementID_IE(element) {
      if (element === window) return 0;
      if (element == document) return 1;
      return element.uniqueID;
    }
  
    var HAS_UNIQUE_ID_PROPERTY = ('uniqueID' in DIV);
    if (HAS_UNIQUE_ID_PROPERTY)
      getUniqueElementID = getUniqueElementID_IE;
  
    function getStorage(element) {
      if (!(element = $(element))) return;
  
      var uid = getUniqueElementID(element);
  
      if (!Element.Storage[uid])
        Element.Storage[uid] = $H();
  
      return Element.Storage[uid];
    }
  
    function store(element, key, value) {
      if (!(element = $(element))) return;
      var storage = getStorage(element);
      if (arguments.length === 2) {
        storage.update(key);
      } else {
        storage.set(key, value);
      }
      return element;
    }
  
    function retrieve(element, key, defaultValue) {
      if (!(element = $(element))) return;
      var storage = getStorage(element), value = storage.get(key);
  
      if (Object.isUndefined(value)) {
        storage.set(key, defaultValue);
        value = defaultValue;
      }
  
      return value;
    }
  
  
    Object.extend(methods, {
      getStorage: getStorage,
      store:      store,
      retrieve:   retrieve
    });
  
  
    var Methods = {}, ByTag = Element.Methods.ByTag,
     F = Prototype.BrowserFeatures;
  
    if (!F.ElementExtensions && ('__proto__' in DIV)) {
      GLOBAL.HTMLElement = {};
      GLOBAL.HTMLElement.prototype = DIV['__proto__'];
      F.ElementExtensions = true;
    }
  
    function checkElementPrototypeDeficiency(tagName) {
      if (typeof window.Element === 'undefined') return false;
      if (!HAS_EXTENDED_CREATE_ELEMENT_SYNTAX) return false;
      var proto = window.Element.prototype;
      if (proto) {
        var id = '_' + (Math.random() + '').slice(2),
         el = document.createElement(tagName);
        proto[id] = 'x';
        var isBuggy = (el[id] !== 'x');
        delete proto[id];
        el = null;
        return isBuggy;
      }
  
      return false;
    }
  
    var HTMLOBJECTELEMENT_PROTOTYPE_BUGGY =
     checkElementPrototypeDeficiency('object');
  
    function extendElementWith(element, methods) {
      for (var property in methods) {
        var value = methods[property];
        if (Object.isFunction(value) && !(property in element))
          element[property] = value.methodize();
      }
    }
  
    var EXTENDED = {};
    function elementIsExtended(element) {
      var uid = getUniqueElementID(element);
      return (uid in EXTENDED);
    }
  
    function extend(element) {
      if (!element || elementIsExtended(element)) return element;
      if (element.nodeType !== Node.ELEMENT_NODE || element == window)
        return element;
  
      var methods = Object.clone(Methods),
       tagName = element.tagName.toUpperCase();
  
      if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
  
      extendElementWith(element, methods);
      EXTENDED[getUniqueElementID(element)] = true;
      return element;
    }
  
    function extend_IE8(element) {
      if (!element || elementIsExtended(element)) return element;
  
      var t = element.tagName;
      if (t && (/^(?:object|applet|embed)$/i.test(t))) {
        extendElementWith(element, Element.Methods);
        extendElementWith(element, Element.Methods.Simulated);
        extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
      }
  
      return element;
    }
  
    if (F.SpecificElementExtensions) {
      extend = HTMLOBJECTELEMENT_PROTOTYPE_BUGGY ? extend_IE8 : Prototype.K;
    }
  
    function addMethodsToTagName(tagName, methods) {
      tagName = tagName.toUpperCase();
      if (!ByTag[tagName]) ByTag[tagName] = {};
      Object.extend(ByTag[tagName], methods);
    }
  
    function mergeMethods(destination, methods, onlyIfAbsent) {
      if (Object.isUndefined(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];
  
      var element = document.createElement(tagName),
       proto = element['__proto__'] || element.constructor.prototype;
  
      element = null;
      return proto;
    }
  
    function addMethods(methods) {
      if (arguments.length === 0) addFormMethods();
  
      if (arguments.length === 2) {
        var tagName = methods;
        methods = arguments[1];
      }
  
      if (!tagName) {
        Object.extend(Element.Methods, methods || {});
      } else {
        if (Object.isArray(tagName)) {
          for (var i = 0, tag; tag = tagName[i]; i++)
            addMethodsToTagName(tag, methods);
        } else {
          addMethodsToTagName(tagName, methods);
        }
      }
  
      var ELEMENT_PROTOTYPE = window.HTMLElement ? HTMLElement.prototype :
       Element.prototype;
  
      if (F.ElementExtensions) {
        mergeMethods(ELEMENT_PROTOTYPE, Element.Methods);
        mergeMethods(ELEMENT_PROTOTYPE, Element.Methods.Simulated, true);
      }
  
      if (F.SpecificElementExtensions) {
        for (var tag in Element.Methods.ByTag) {
          var klass = findDOMClass(tag);
          if (Object.isUndefined(klass)) continue;
          mergeMethods(klass.prototype, ByTag[tag]);
        }
      }
  
      Object.extend(Element, Element.Methods);
      Object.extend(Element, Element.Methods.Simulated);
      delete Element.ByTag;
      delete Element.Simulated;
  
      Element.extend.refresh();
  
      ELEMENT_CACHE = {};
    }
  
    Object.extend(GLOBAL.Element, {
      extend:     extend,
      addMethods: addMethods
    });
  
    if (extend === Prototype.K) {
      GLOBAL.Element.extend.refresh = Prototype.emptyFunction;
    } else {
      GLOBAL.Element.extend.refresh = function() {
        if (Prototype.BrowserFeatures.ElementExtensions) return;
        Object.extend(Methods, Element.Methods);
        Object.extend(Methods, Element.Methods.Simulated);
  
        EXTENDED = {};
      };
    }
  
    function addFormMethods() {
      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),
        "BUTTON":   Object.clone(Form.Element.Methods)
      });
    }
  
    Element.addMethods(methods);
  
    function destroyCache_IE() {
      DIV = null;
      ELEMENT_CACHE = null;
    }
  
    if (window.attachEvent)
      window.attachEvent('onunload', destroyCache_IE);
  
  })(this);
  (function() {
  
    function toDecimal(pctString) {
      var match = pctString.match(/^(\d+)%?$/i);
      if (!match) return null;
      return (Number(match[1]) / 100);
    }
  
    function getRawStyle(element, style) {
      element = $(element);
  
      var value = element.style[style];
      if (!value || value === 'auto') {
        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;
    }
  
    function getRawStyle_IE(element, style) {
      var value = element.style[style];
      if (!value && element.currentStyle) {
        value = element.currentStyle[style];
      }
      return value;
    }
  
    function getContentWidth(element, context) {
      var boxWidth = element.offsetWidth;
  
      var bl = getPixelValue(element, 'borderLeftWidth',  context) || 0;
      var br = getPixelValue(element, 'borderRightWidth', context) || 0;
      var pl = getPixelValue(element, 'paddingLeft',      context) || 0;
      var pr = getPixelValue(element, 'paddingRight',     context) || 0;
  
      return boxWidth - bl - br - pl - pr;
    }
  
    if ('currentStyle' in document.documentElement) {
      getRawStyle = getRawStyle_IE;
    }
  
  
    function getPixelValue(value, property, context) {
      var element = null;
      if (Object.isElement(value)) {
        element = value;
        value = getRawStyle(element, property);
      }
  
      if (value === null || Object.isUndefined(value)) {
        return null;
      }
  
      if ((/^(?:-)?\d+(\.\d+)?(px)?$/i).test(value)) {
        return window.parseFloat(value);
      }
  
      var isPercentage = value.include('%'), isViewport = (context === document.viewport);
  
      if (/\d/.test(value) && element && element.runtimeStyle && !(isPercentage && isViewport)) {
        var style = element.style.left, rStyle = element.runtimeStyle.left;
        element.runtimeStyle.left = element.currentStyle.left;
        element.style.left = value || 0;
        value = element.style.pixelLeft;
        element.style.left = style;
        element.runtimeStyle.left = rStyle;
  
        return value;
      }
  
      if (element && isPercentage) {
        context = context || element.parentNode;
        var decimal = toDecimal(value), whole = null;
  
        var isHorizontal = property.include('left') || property.include('right') ||
         property.include('width');
  
        var isVertical   = property.include('top') || property.include('bottom') ||
          property.include('height');
  
        if (context === document.viewport) {
          if (isHorizontal) {
            whole = document.viewport.getWidth();
          } else if (isVertical) {
            whole = document.viewport.getHeight();
          }
        } else {
          if (isHorizontal) {
            whole = $(context).measure('width');
          } else if (isVertical) {
            whole = $(context).measure('height');
          }
        }
  
        return (whole === null) ? 0 : whole * decimal;
      }
  
      return 0;
    }
  
    function toCSSPixels(number) {
      if (Object.isString(number) && number.endsWith('px'))
        return number;
      return number + 'px';
    }
  
    function isDisplayed(element) {
      while (element && element.parentNode) {
        var display = element.getStyle('display');
        if (display === 'none') {
          return false;
        }
        element = $(element.parentNode);
      }
      return true;
    }
  
    var hasLayout = Prototype.K;
    if ('currentStyle' in document.documentElement) {
      hasLayout = function(element) {
        if (!element.currentStyle.hasLayout) {
          element.style.zoom = 1;
        }
        return element;
      };
    }
  
    function cssNameFor(key) {
      if (key.include('border')) key = key + '-width';
      return key.camelize();
    }
  
    Element.Layout = Class.create(Hash, {
      initialize: function($super, element, preCompute) {
        $super();
        this.element = $(element);
  
        Element.Layout.PROPERTIES.each( function(property) {
          this._set(property, null);
        }, this);
  
        if (preCompute) {
          this._preComputing = true;
          this._begin();
          Element.Layout.PROPERTIES.each( this._compute, this );
          this._end();
          this._preComputing = false;
        }
      },
  
      _set: function(property, value) {
        return Hash.prototype.set.call(this, property, value);
      },
  
      set: function(property, value) {
        throw "Properties of Element.Layout are read-only.";
      },
  
      get: function($super, property) {
        var value = $super(property);
        return value === null ? this._compute(property) : value;
      },
  
      _begin: function() {
        if (this._isPrepared()) return;
  
        var element = this.element;
        if (isDisplayed(element)) {
          this._setPrepared(true);
          return;
        }
  
  
        var originalStyles = {
          position:   element.style.position   || '',
          width:      element.style.width      || '',
          visibility: element.style.visibility || '',
          display:    element.style.display    || ''
        };
  
        element.store('prototype_original_styles', originalStyles);
  
        var position = getRawStyle(element, 'position'), width = element.offsetWidth;
  
        if (width === 0 || width === null) {
          element.style.display = 'block';
          width = element.offsetWidth;
        }
  
        var context = (position === 'fixed') ? document.viewport :
         element.parentNode;
  
        var tempStyles = {
          visibility: 'hidden',
          display:    'block'
        };
  
        if (position !== 'fixed') tempStyles.position = 'absolute';
  
        element.setStyle(tempStyles);
  
        var positionedWidth = element.offsetWidth, newWidth;
        if (width && (positionedWidth === width)) {
          newWidth = getContentWidth(element, context);
        } else if (position === 'absolute' || position === 'fixed') {
          newWidth = getContentWidth(element, context);
        } else {
          var parent = element.parentNode, pLayout = $(parent).getLayout();
  
          newWidth = pLayout.get('width') -
           this.get('margin-left') -
           this.get('border-left') -
           this.get('padding-left') -
           this.get('padding-right') -
           this.get('border-right') -
           this.get('margin-right');
        }
  
        element.setStyle({ width: newWidth + 'px' });
  
        this._setPrepared(true);
      },
  
      _end: function() {
        var element = this.element;
        var originalStyles = element.retrieve('prototype_original_styles');
        element.store('prototype_original_styles', null);
        element.setStyle(originalStyles);
        this._setPrepared(false);
      },
  
      _compute: function(property) {
        var COMPUTATIONS = Element.Layout.COMPUTATIONS;
        if (!(property in COMPUTATIONS)) {
          throw "Property not found.";
        }
  
        return this._set(property, COMPUTATIONS[property].call(this, this.element));
      },
  
      _isPrepared: function() {
        return this.element.retrieve('prototype_element_layout_prepared', false);
      },
  
      _setPrepared: function(bool) {
        return this.element.store('prototype_element_layout_prepared', bool);
      },
  
      toObject: function() {
        var args = $A(arguments);
        var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
         args.join(' ').split(' ');
        var obj = {};
        keys.each( function(key) {
          if (!Element.Layout.PROPERTIES.include(key)) return;
          var value = this.get(key);
          if (value != null) obj[key] = value;
        }, this);
        return obj;
      },
  
      toHash: function() {
        var obj = this.toObject.apply(this, arguments);
        return new Hash(obj);
      },
  
      toCSS: function() {
        var args = $A(arguments);
        var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
         args.join(' ').split(' ');
        var css = {};
  
        keys.each( function(key) {
          if (!Element.Layout.PROPERTIES.include(key)) return;
          if (Element.Layout.COMPOSITE_PROPERTIES.include(key)) return;
  
          var value = this.get(key);
          if (value != null) css[cssNameFor(key)] = value + 'px';
        }, this);
        return css;
      },
  
      inspect: function() {
        return "#<Element.Layout>";
      }
    });
  
    Object.extend(Element.Layout, {
      PROPERTIES: $w('height width top left right bottom border-left border-right border-top border-bottom padding-left padding-right padding-top padding-bottom margin-top margin-bottom margin-left margin-right padding-box-width padding-box-height border-box-width border-box-height margin-box-width margin-box-height'),
  
      COMPOSITE_PROPERTIES: $w('padding-box-width padding-box-height margin-box-width margin-box-height border-box-width border-box-height'),
  
      COMPUTATIONS: {
        'height': function(element) {
          if (!this._preComputing) this._begin();
  
          var bHeight = this.get('border-box-height');
          if (bHeight <= 0) {
            if (!this._preComputing) this._end();
            return 0;
          }
  
          var bTop = this.get('border-top'),
           bBottom = this.get('border-bottom');
  
          var pTop = this.get('padding-top'),
           pBottom = this.get('padding-bottom');
  
          if (!this._preComputing) this._end();
  
          return bHeight - bTop - bBottom - pTop - pBottom;
        },
  
        'width': function(element) {
          if (!this._preComputing) this._begin();
  
          var bWidth = this.get('border-box-width');
          if (bWidth <= 0) {
            if (!this._preComputing) this._end();
            return 0;
          }
  
          var bLeft = this.get('border-left'),
           bRight = this.get('border-right');
  
          var pLeft = this.get('padding-left'),
           pRight = this.get('padding-right');
  
          if (!this._preComputing) this._end();
          return bWidth - bLeft - bRight - pLeft - pRight;
        },
  
        'padding-box-height': function(element) {
          var height = this.get('height'),
           pTop = this.get('padding-top'),
           pBottom = this.get('padding-bottom');
  
          return height + pTop + pBottom;
        },
  
        'padding-box-width': function(element) {
          var width = this.get('width'),
           pLeft = this.get('padding-left'),
           pRight = this.get('padding-right');
  
          return width + pLeft + pRight;
        },
  
        'border-box-height': function(element) {
          if (!this._preComputing) this._begin();
          var height = element.offsetHeight;
          if (!this._preComputing) this._end();
          return height;
        },
  
        'border-box-width': function(element) {
          if (!this._preComputing) this._begin();
          var width = element.offsetWidth;
          if (!this._preComputing) this._end();
          return width;
        },
  
        'margin-box-height': function(element) {
          var bHeight = this.get('border-box-height'),
           mTop = this.get('margin-top'),
           mBottom = this.get('margin-bottom');
  
          if (bHeight <= 0) return 0;
  
          return bHeight + mTop + mBottom;
        },
  
        'margin-box-width': function(element) {
          var bWidth = this.get('border-box-width'),
           mLeft = this.get('margin-left'),
           mRight = this.get('margin-right');
  
          if (bWidth <= 0) return 0;
  
          return bWidth + mLeft + mRight;
        },
  
        'top': function(element) {
          var offset = element.positionedOffset();
          return offset.top;
        },
  
        'bottom': function(element) {
          var offset = element.positionedOffset(),
           parent = element.getOffsetParent(),
           pHeight = parent.measure('height');
  
          var mHeight = this.get('border-box-height');
  
          return pHeight - mHeight - offset.top;
        },
  
        'left': function(element) {
          var offset = element.positionedOffset();
          return offset.left;
        },
  
        'right': function(element) {
          var offset = element.positionedOffset(),
           parent = element.getOffsetParent(),
           pWidth = parent.measure('width');
  
          var mWidth = this.get('border-box-width');
  
          return pWidth - mWidth - offset.left;
        },
  
        'padding-top': function(element) {
          return getPixelValue(element, 'paddingTop');
        },
  
        'padding-bottom': function(element) {
          return getPixelValue(element, 'paddingBottom');
        },
  
        'padding-left': function(element) {
          return getPixelValue(element, 'paddingLeft');
        },
  
        'padding-right': function(element) {
          return getPixelValue(element, 'paddingRight');
        },
  
        'border-top': function(element) {
          return getPixelValue(element, 'borderTopWidth');
        },
  
        'border-bottom': function(element) {
          return getPixelValue(element, 'borderBottomWidth');
        },
  
        'border-left': function(element) {
          return getPixelValue(element, 'borderLeftWidth');
        },
  
        'border-right': function(element) {
          return getPixelValue(element, 'borderRightWidth');
        },
  
        'margin-top': function(element) {
          return getPixelValue(element, 'marginTop');
        },
  
        'margin-bottom': function(element) {
          return getPixelValue(element, 'marginBottom');
        },
  
        'margin-left': function(element) {
          return getPixelValue(element, 'marginLeft');
        },
  
        'margin-right': function(element) {
          return getPixelValue(element, 'marginRight');
        }
      }
    });
  
    if ('getBoundingClientRect' in document.documentElement) {
      Object.extend(Element.Layout.COMPUTATIONS, {
        'right': function(element) {
          var parent = hasLayout(element.getOffsetParent());
          var rect = element.getBoundingClientRect(),
           pRect = parent.getBoundingClientRect();
  
          return (pRect.right - rect.right).round();
        },
  
        'bottom': function(element) {
          var parent = hasLayout(element.getOffsetParent());
          var rect = element.getBoundingClientRect(),
           pRect = parent.getBoundingClientRect();
  
          return (pRect.bottom - rect.bottom).round();
        }
      });
    }
  
    Element.Offset = Class.create({
      initialize: function(left, top) {
        this.left = left.round();
        this.top  = top.round();
  
        this[0] = this.left;
        this[1] = this.top;
      },
  
      relativeTo: function(offset) {
        return new Element.Offset(
          this.left - offset.left,
          this.top  - offset.top
        );
      },
  
      inspect: function() {
        return "#<Element.Offset left: #{left} top: #{top}>".interpolate(this);
      },
  
      toString: function() {
        return "[#{left}, #{top}]".interpolate(this);
      },
  
      toArray: function() {
        return [this.left, this.top];
      }
    });
  
    function getLayout(element, preCompute) {
      return new Element.Layout(element, preCompute);
    }
  
    function measure(element, property) {
      return $(element).getLayout().get(property);
    }
  
    function getHeight(element) {
      return Element.getDimensions(element).height;
    }
  
    function getWidth(element) {
      return Element.getDimensions(element).width;
    }
  
    function getDimensions(element) {
      element = $(element);
      var display = Element.getStyle(element, 'display');
  
      if (display && display !== 'none') {
        return { width: element.offsetWidth, height: element.offsetHeight };
      }
  
      var style = element.style;
      var originalStyles = {
        visibility: style.visibility,
        position:   style.position,
        display:    style.display
      };
  
      var newStyles = {
        visibility: 'hidden',
        display:    'block'
      };
  
      if (originalStyles.position !== 'fixed')
        newStyles.position = 'absolute';
  
      Element.setStyle(element, newStyles);
  
      var dimensions = {
        width:  element.offsetWidth,
        height: element.offsetHeight
      };
  
      Element.setStyle(element, originalStyles);
  
      return dimensions;
    }
  
    function getOffsetParent(element) {
      element = $(element);
  
      if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
        return $(document.body);
  
      var isInline = (Element.getStyle(element, 'display') === 'inline');
      if (!isInline && element.offsetParent) return $(element.offsetParent);
  
      while ((element = element.parentNode) && element !== document.body) {
        if (Element.getStyle(element, 'position') !== 'static') {
          return isHtml(element) ? $(document.body) : $(element);
        }
      }
  
      return $(document.body);
    }
  
  
    function cumulativeOffset(element) {
      element = $(element);
      var valueT = 0, valueL = 0;
      if (element.parentNode) {
        do {
          valueT += element.offsetTop  || 0;
          valueL += element.offsetLeft || 0;
          element = element.offsetParent;
        } while (element);
      }
      return new Element.Offset(valueL, valueT);
    }
  
    function positionedOffset(element) {
      element = $(element);
  
      var layout = element.getLayout();
  
      var valueT = 0, valueL = 0;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        element = element.offsetParent;
        if (element) {
          if (isBody(element)) break;
          var p = Element.getStyle(element, 'position');
          if (p !== 'static') break;
        }
      } while (element);
  
      valueL -= layout.get('margin-top');
      valueT -= layout.get('margin-left');
  
      return new Element.Offset(valueL, valueT);
    }
  
    function cumulativeScrollOffset(element) {
      var valueT = 0, valueL = 0;
      do {
        if (element === document.body) {
          var bodyScrollNode = document.documentElement || document.body.parentNode || document.body;
          valueT += !Object.isUndefined(window.pageYOffset) ? window.pageYOffset : bodyScrollNode.scrollTop || 0;
          valueL += !Object.isUndefined(window.pageXOffset) ? window.pageXOffset : bodyScrollNode.scrollLeft || 0;
          break;
        } else {
          valueT += element.scrollTop  || 0;
          valueL += element.scrollLeft || 0;
          element = element.parentNode;
        }
      } while (element);
      return new Element.Offset(valueL, valueT);
    }
  
    function viewportOffset(forElement) {
      var valueT = 0, valueL = 0, docBody = document.body;
  
      forElement = $(forElement);
      var element = forElement;
      do {
        valueT += element.offsetTop  || 0;
        valueL += element.offsetLeft || 0;
        if (element.offsetParent == docBody &&
          Element.getStyle(element, 'position') == 'absolute') break;
      } while (element = element.offsetParent);
  
      element = forElement;
      do {
        if (element != docBody) {
          valueT -= element.scrollTop  || 0;
          valueL -= element.scrollLeft || 0;
        }
      } while (element = element.parentNode);
      return new Element.Offset(valueL, valueT);
    }
  
    function absolutize(element) {
      element = $(element);
  
      if (Element.getStyle(element, 'position') === 'absolute') {
        return element;
      }
  
      var offsetParent = getOffsetParent(element);
      var eOffset = element.viewportOffset(),
       pOffset = offsetParent.viewportOffset();
  
      var offset = eOffset.relativeTo(pOffset);
      var layout = element.getLayout();
  
      element.store('prototype_absolutize_original_styles', {
        position: element.getStyle('position'),
        left:     element.getStyle('left'),
        top:      element.getStyle('top'),
        width:    element.getStyle('width'),
        height:   element.getStyle('height')
      });
  
      element.setStyle({
        position: 'absolute',
        top:    offset.top + 'px',
        left:   offset.left + 'px',
        width:  layout.get('width') + 'px',
        height: layout.get('height') + 'px'
      });
  
      return element;
    }
  
    function relativize(element) {
      element = $(element);
      if (Element.getStyle(element, 'position') === 'relative') {
        return element;
      }
  
      var originalStyles =
       element.retrieve('prototype_absolutize_original_styles');
  
      if (originalStyles) element.setStyle(originalStyles);
      return element;
    }
  
  
    function scrollTo(element) {
      element = $(element);
      var pos = Element.cumulativeOffset(element);
      window.scrollTo(pos.left, pos.top);
      return element;
    }
  
  
    function makePositioned(element) {
      element = $(element);
      var position = Element.getStyle(element, 'position'), styles = {};
      if (position === 'static' || !position) {
        styles.position = 'relative';
        if (Prototype.Browser.Opera) {
          styles.top  = 0;
          styles.left = 0;
        }
        Element.setStyle(element, styles);
        Element.store(element, 'prototype_made_positioned', true);
      }
      return element;
    }
  
    function undoPositioned(element) {
      element = $(element);
      var storage = Element.getStorage(element),
       madePositioned = storage.get('prototype_made_positioned');
  
      if (madePositioned) {
        storage.unset('prototype_made_positioned');
        Element.setStyle(element, {
          position: '',
          top:      '',
          bottom:   '',
          left:     '',
          right:    ''
        });
      }
      return element;
    }
  
    function makeClipping(element) {
      element = $(element);
  
      var storage = Element.getStorage(element),
       madeClipping = storage.get('prototype_made_clipping');
  
      if (Object.isUndefined(madeClipping)) {
        var overflow = Element.getStyle(element, 'overflow');
        storage.set('prototype_made_clipping', overflow);
        if (overflow !== 'hidden')
          element.style.overflow = 'hidden';
      }
  
      return element;
    }
  
    function undoClipping(element) {
      element = $(element);
      var storage = Element.getStorage(element),
       overflow = storage.get('prototype_made_clipping');
  
      if (!Object.isUndefined(overflow)) {
        storage.unset('prototype_made_clipping');
        element.style.overflow = overflow || '';
      }
  
      return element;
    }
  
    function clonePosition(element, source, options) {
      options = Object.extend({
        setLeft:    true,
        setTop:     true,
        setWidth:   true,
        setHeight:  true,
        offsetTop:  0,
        offsetLeft: 0
      }, options || {});
  
      source  = $(source);
      element = $(element);
      var p, delta, layout, styles = {};
  
      if (options.setLeft || options.setTop) {
        p = Element.viewportOffset(source);
        delta = [0, 0];
        if (Element.getStyle(element, 'position') === 'absolute') {
          var parent = Element.getOffsetParent(element);
          if (parent !== document.body) delta = Element.viewportOffset(parent);
        }
      }
  
      if (options.setWidth || options.setHeight) {
        layout = Element.getLayout(source);
      }
  
      if (options.setLeft)
        styles.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
      if (options.setTop)
        styles.top  = (p[1] - delta[1] + options.offsetTop)  + 'px';
  
      if (options.setWidth)
        styles.width  = layout.get('border-box-width')  + 'px';
      if (options.setHeight)
        styles.height = layout.get('border-box-height') + 'px';
  
      return Element.setStyle(element, styles);
    }
  
  
    if (Prototype.Browser.IE) {
      getOffsetParent = getOffsetParent.wrap(
        function(proceed, element) {
          element = $(element);
  
          if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
            return $(document.body);
  
          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;
        }
      );
  
      positionedOffset = positionedOffset.wrap(function(proceed, element) {
        element = $(element);
        if (!element.parentNode) return new Element.Offset(0, 0);
        var position = element.getStyle('position');
        if (position !== 'static') return proceed(element);
  
        var offsetParent = element.getOffsetParent();
        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
          hasLayout(offsetParent);
  
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
      });
    } else if (Prototype.Browser.Webkit) {
      cumulativeOffset = function(element) {
        element = $(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 new Element.Offset(valueL, valueT);
      };
    }
  
  
    Element.addMethods({
      getLayout:              getLayout,
      measure:                measure,
      getWidth:               getWidth,
      getHeight:              getHeight,
      getDimensions:          getDimensions,
      getOffsetParent:        getOffsetParent,
      cumulativeOffset:       cumulativeOffset,
      positionedOffset:       positionedOffset,
      cumulativeScrollOffset: cumulativeScrollOffset,
      viewportOffset:         viewportOffset,
      absolutize:             absolutize,
      relativize:             relativize,
      scrollTo:               scrollTo,
      makePositioned:         makePositioned,
      undoPositioned:         undoPositioned,
      makeClipping:           makeClipping,
      undoClipping:           undoClipping,
      clonePosition:          clonePosition
    });
  
    function isBody(element) {
      return element.nodeName.toUpperCase() === 'BODY';
    }
  
    function isHtml(element) {
      return element.nodeName.toUpperCase() === 'HTML';
    }
  
    function isDocument(element) {
      return element.nodeType === Node.DOCUMENT_NODE;
    }
  
    function isDetached(element) {
      return element !== document.body &&
       !Element.descendantOf(element, document.body);
    }
  
    if ('getBoundingClientRect' in document.documentElement) {
      Element.addMethods({
        viewportOffset: function(element) {
          element = $(element);
          if (isDetached(element)) return new Element.Offset(0, 0);
  
          var rect = element.getBoundingClientRect(),
           docEl = document.documentElement;
          return new Element.Offset(rect.left - docEl.clientLeft,
           rect.top - docEl.clientTop);
        }
      });
    }
  
  
  })();
  
  (function() {
  
    var IS_OLD_OPERA = Prototype.Browser.Opera &&
     (window.parseFloat(window.opera.version()) < 9.5);
    var ROOT = null;
    function getRootElement() {
      if (ROOT) return ROOT;
      ROOT = IS_OLD_OPERA ? document.body : document.documentElement;
      return ROOT;
    }
  
    function getDimensions() {
      return { width: this.getWidth(), height: this.getHeight() };
    }
  
    function getWidth() {
      return getRootElement().clientWidth;
    }
  
    function getHeight() {
      return getRootElement().clientHeight;
    }
  
    function getScrollOffsets() {
      var x = window.pageXOffset || document.documentElement.scrollLeft ||
       document.body.scrollLeft;
      var y = window.pageYOffset || document.documentElement.scrollTop ||
       document.body.scrollTop;
  
      return new Element.Offset(x, y);
    }
  
    document.viewport = {
      getDimensions:    getDimensions,
      getWidth:         getWidth,
      getHeight:        getHeight,
      getScrollOffsets: getScrollOffsets
    };
  
  })();
  window.$$ = function() {
    var expression = $A(arguments).join(', ');
    return Prototype.Selector.select(expression, document);
  };
  
  Prototype.Selector = (function() {
  
    function select() {
      throw new Error('Method "Prototype.Selector.select" must be defined.');
    }
  
    function match() {
      throw new Error('Method "Prototype.Selector.match" must be defined.');
    }
  
    function find(elements, expression, index) {
      index = index || 0;
      var match = Prototype.Selector.match, length = elements.length, matchIndex = 0, i;
  
      for (i = 0; i < length; i++) {
        if (match(elements[i], expression) && index == matchIndex++) {
          return Element.extend(elements[i]);
        }
      }
    }
  
    function extendElements(elements) {
      for (var i = 0, length = elements.length; i < length; i++) {
        Element.extend(elements[i]);
      }
      return elements;
    }
  
  
    var K = Prototype.K;
  
    return {
      select: select,
      match: match,
      find: find,
      extendElements: (Element.extend === K) ? K : extendElements,
      extendElement: Element.extend
    };
  })();
  Prototype._original_property = window.Sizzle;
  /*!
   * Sizzle CSS Selector Engine v@VERSION
   * http://sizzlejs.com/
   *
   * Copyright 2013 jQuery Foundation, Inc. and other contributors
   * Released under the MIT license
   * http://jquery.org/license
   *
   * Date: @DATE
   */
  (function( window ) {
  
  var i,
  	support,
  	Expr,
  	getText,
  	isXML,
  	compile,
  	select,
  	outermostContext,
  	sortInput,
  	hasDuplicate,
  
  	setDocument,
  	document,
  	docElem,
  	documentIsHTML,
  	rbuggyQSA,
  	rbuggyMatches,
  	matches,
  	contains,
  
  	expando = "sizzle" + -(new Date()),
  	preferredDoc = window.document,
  	dirruns = 0,
  	done = 0,
  	classCache = createCache(),
  	tokenCache = createCache(),
  	compilerCache = createCache(),
  	sortOrder = function( a, b ) {
  		if ( a === b ) {
  			hasDuplicate = true;
  		}
  		return 0;
  	},
  
  	strundefined = typeof undefined,
  	MAX_NEGATIVE = 1 << 31,
  
  	hasOwn = ({}).hasOwnProperty,
  	arr = [],
  	pop = arr.pop,
  	push_native = arr.push,
  	push = arr.push,
  	slice = arr.slice,
  	indexOf = arr.indexOf || function( elem ) {
  		var i = 0,
  			len = this.length;
  		for ( ; i < len; i++ ) {
  			if ( this[i] === elem ) {
  				return i;
  			}
  		}
  		return -1;
  	},
  
  	booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped",
  
  
  	whitespace = "[\\x20\\t\\r\\n\\f]",
  	characterEncoding = "(?:\\\\.|[\\w-]|[^\\x00-\\xa0])+",
  
  	identifier = characterEncoding.replace( "w", "w#" ),
  
  	attributes = "\\[" + whitespace + "*(" + characterEncoding + ")" + whitespace +
  		"*(?:([*^$|!~]?=)" + whitespace + "*(?:(['\"])((?:\\\\.|[^\\\\])*?)\\3|(" + identifier + ")|)|)" + whitespace + "*\\]",
  
  	pseudos = ":(" + characterEncoding + ")(?:\\(((['\"])((?:\\\\.|[^\\\\])*?)\\3|((?:\\\\.|[^\\\\()[\\]]|" + attributes.replace( 3, 8 ) + ")*)|.*)\\)|)",
  
  	rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),
  
  	rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
  	rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ),
  
  	rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*?)" + whitespace + "*\\]", "g" ),
  
  	rpseudo = new RegExp( pseudos ),
  	ridentifier = new RegExp( "^" + identifier + "$" ),
  
  	matchExpr = {
  		"ID": new RegExp( "^#(" + characterEncoding + ")" ),
  		"CLASS": new RegExp( "^\\.(" + characterEncoding + ")" ),
  		"TAG": new RegExp( "^(" + characterEncoding.replace( "w", "w*" ) + ")" ),
  		"ATTR": new RegExp( "^" + attributes ),
  		"PSEUDO": new RegExp( "^" + pseudos ),
  		"CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace +
  			"*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace +
  			"*(\\d+)|))" + whitespace + "*\\)|)", "i" ),
  		"bool": new RegExp( "^(?:" + booleans + ")$", "i" ),
  		"needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" +
  			whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" )
  	},
  
  	rinputs = /^(?:input|select|textarea|button)$/i,
  	rheader = /^h\d$/i,
  
  	rnative = /^[^{]+\{\s*\[native \w/,
  
  	rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,
  
  	rsibling = /[+~]/,
  	rescape = /'|\\/g,
  
  	runescape = new RegExp( "\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ),
  	funescape = function( _, escaped, escapedWhitespace ) {
  		var high = "0x" + escaped - 0x10000;
  		return high !== high || escapedWhitespace ?
  			escaped :
  			high < 0 ?
  				String.fromCharCode( high + 0x10000 ) :
  				String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
  	};
  
  try {
  	push.apply(
  		(arr = slice.call( preferredDoc.childNodes )),
  		preferredDoc.childNodes
  	);
  	arr[ preferredDoc.childNodes.length ].nodeType;
  } catch ( e ) {
  	push = { apply: arr.length ?
  
  		function( target, els ) {
  			push_native.apply( target, slice.call(els) );
  		} :
  
  		function( target, els ) {
  			var j = target.length,
  				i = 0;
  			while ( (target[j++] = els[i++]) ) {}
  			target.length = j - 1;
  		}
  	};
  }
  
  function Sizzle( selector, context, results, seed ) {
  	var match, elem, m, nodeType,
  		i, groups, old, nid, newContext, newSelector;
  
  	if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
  		setDocument( context );
  	}
  
  	context = context || document;
  	results = results || [];
  
  	if ( !selector || typeof selector !== "string" ) {
  		return results;
  	}
  
  	if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
  		return [];
  	}
  
  	if ( documentIsHTML && !seed ) {
  
  		if ( (match = rquickExpr.exec( selector )) ) {
  			if ( (m = match[1]) ) {
  				if ( nodeType === 9 ) {
  					elem = context.getElementById( m );
  					if ( elem && elem.parentNode ) {
  						if ( elem.id === m ) {
  							results.push( elem );
  							return results;
  						}
  					} else {
  						return results;
  					}
  				} else {
  					if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
  						contains( context, elem ) && elem.id === m ) {
  						results.push( elem );
  						return results;
  					}
  				}
  
  			} else if ( match[2] ) {
  				push.apply( results, context.getElementsByTagName( selector ) );
  				return results;
  
  			} else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) {
  				push.apply( results, context.getElementsByClassName( m ) );
  				return results;
  			}
  		}
  
  		if ( support.qsa && (!rbuggyQSA || !rbuggyQSA.test( selector )) ) {
  			nid = old = expando;
  			newContext = context;
  			newSelector = nodeType === 9 && selector;
  
  			if ( nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
  				groups = tokenize( selector );
  
  				if ( (old = context.getAttribute("id")) ) {
  					nid = old.replace( rescape, "\\$&" );
  				} else {
  					context.setAttribute( "id", nid );
  				}
  				nid = "[id='" + nid + "'] ";
  
  				i = groups.length;
  				while ( i-- ) {
  					groups[i] = nid + toSelector( groups[i] );
  				}
  				newContext = rsibling.test( selector ) && testContext( context.parentNode ) || context;
  				newSelector = groups.join(",");
  			}
  
  			if ( newSelector ) {
  				try {
  					push.apply( results,
  						newContext.querySelectorAll( newSelector )
  					);
  					return results;
  				} catch(qsaError) {
  				} finally {
  					if ( !old ) {
  						context.removeAttribute("id");
  					}
  				}
  			}
  		}
  	}
  
  	return select( selector.replace( rtrim, "$1" ), context, results, seed );
  }
  
  /**
   * Create key-value caches of limited size
   * @returns {Function(string, Object)} Returns the Object data after storing it on itself with
   *	property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength)
   *	deleting the oldest entry
   */
  function createCache() {
  	var keys = [];
  
  	function cache( key, value ) {
  		if ( keys.push( key + " " ) > Expr.cacheLength ) {
  			delete cache[ keys.shift() ];
  		}
  		return (cache[ key + " " ] = value);
  	}
  	return cache;
  }
  
  /**
   * Mark a function for special use by Sizzle
   * @param {Function} fn The function to mark
   */
  function markFunction( fn ) {
  	fn[ expando ] = true;
  	return fn;
  }
  
  /**
   * Support testing using an element
   * @param {Function} fn Passed the created div and expects a boolean result
   */
  function assert( fn ) {
  	var div = document.createElement("div");
  
  	try {
  		return !!fn( div );
  	} catch (e) {
  		return false;
  	} finally {
  		if ( div.parentNode ) {
  			div.parentNode.removeChild( div );
  		}
  		div = null;
  	}
  }
  
  /**
   * Adds the same handler for all of the specified attrs
   * @param {String} attrs Pipe-separated list of attributes
   * @param {Function} handler The method that will be applied
   */
  function addHandle( attrs, handler ) {
  	var arr = attrs.split("|"),
  		i = attrs.length;
  
  	while ( i-- ) {
  		Expr.attrHandle[ arr[i] ] = handler;
  	}
  }
  
  /**
   * Checks document order of two siblings
   * @param {Element} a
   * @param {Element} b
   * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b
   */
  function siblingCheck( a, b ) {
  	var cur = b && a,
  		diff = cur && a.nodeType === 1 && b.nodeType === 1 &&
  			( ~b.sourceIndex || MAX_NEGATIVE ) -
  			( ~a.sourceIndex || MAX_NEGATIVE );
  
  	if ( diff ) {
  		return diff;
  	}
  
  	if ( cur ) {
  		while ( (cur = cur.nextSibling) ) {
  			if ( cur === b ) {
  				return -1;
  			}
  		}
  	}
  
  	return a ? 1 : -1;
  }
  
  /**
   * Returns a function to use in pseudos for input types
   * @param {String} type
   */
  function createInputPseudo( type ) {
  	return function( elem ) {
  		var name = elem.nodeName.toLowerCase();
  		return name === "input" && elem.type === type;
  	};
  }
  
  /**
   * Returns a function to use in pseudos for buttons
   * @param {String} type
   */
  function createButtonPseudo( type ) {
  	return function( elem ) {
  		var name = elem.nodeName.toLowerCase();
  		return (name === "input" || name === "button") && elem.type === type;
  	};
  }
  
  /**
   * Returns a function to use in pseudos for positionals
   * @param {Function} fn
   */
  function createPositionalPseudo( fn ) {
  	return markFunction(function( argument ) {
  		argument = +argument;
  		return markFunction(function( seed, matches ) {
  			var j,
  				matchIndexes = fn( [], seed.length, argument ),
  				i = matchIndexes.length;
  
  			while ( i-- ) {
  				if ( seed[ (j = matchIndexes[i]) ] ) {
  					seed[j] = !(matches[j] = seed[j]);
  				}
  			}
  		});
  	});
  }
  
  /**
   * Checks a node for validity as a Sizzle context
   * @param {Element|Object=} context
   * @returns {Element|Object|Boolean} The input node if acceptable, otherwise a falsy value
   */
  function testContext( context ) {
  	return context && typeof context.getElementsByTagName !== strundefined && context;
  }
  
  support = Sizzle.support = {};
  
  /**
   * Detects XML nodes
   * @param {Element|Object} elem An element or a document
   * @returns {Boolean} True iff elem is a non-HTML XML node
   */
  isXML = Sizzle.isXML = function( elem ) {
  	var documentElement = elem && (elem.ownerDocument || elem).documentElement;
  	return documentElement ? documentElement.nodeName !== "HTML" : false;
  };
  
  /**
   * Sets document-related variables once based on the current document
   * @param {Element|Object} [doc] An element or document object to use to set the document
   * @returns {Object} Returns the current document
   */
  setDocument = Sizzle.setDocument = function( node ) {
  	var hasCompare,
  		doc = node ? node.ownerDocument || node : preferredDoc,
  		parent = doc.defaultView;
  
  	if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
  		return document;
  	}
  
  	document = doc;
  	docElem = doc.documentElement;
  
  	documentIsHTML = !isXML( doc );
  
  	if ( parent && parent !== parent.top ) {
  		if ( parent.addEventListener ) {
  			parent.addEventListener( "unload", function() {
  				setDocument();
  			}, false );
  		} else if ( parent.attachEvent ) {
  			parent.attachEvent( "onunload", function() {
  				setDocument();
  			});
  		}
  	}
  
  	/* Attributes
  	---------------------------------------------------------------------- */
  
  	support.attributes = assert(function( div ) {
  		div.className = "i";
  		return !div.getAttribute("className");
  	});
  
  	/* getElement(s)By*
  	---------------------------------------------------------------------- */
  
  	support.getElementsByTagName = assert(function( div ) {
  		div.appendChild( doc.createComment("") );
  		return !div.getElementsByTagName("*").length;
  	});
  
  	support.getElementsByClassName = rnative.test( doc.getElementsByClassName ) && assert(function( div ) {
  		div.innerHTML = "<div class='a'></div><div class='a i'></div>";
  
  		div.firstChild.className = "i";
  		return div.getElementsByClassName("i").length === 2;
  	});
  
  	support.getById = assert(function( div ) {
  		docElem.appendChild( div ).id = expando;
  		return !doc.getElementsByName || !doc.getElementsByName( expando ).length;
  	});
  
  	if ( support.getById ) {
  		Expr.find["ID"] = function( id, context ) {
  			if ( typeof context.getElementById !== strundefined && documentIsHTML ) {
  				var m = context.getElementById( id );
  				return m && m.parentNode ? [m] : [];
  			}
  		};
  		Expr.filter["ID"] = function( id ) {
  			var attrId = id.replace( runescape, funescape );
  			return function( elem ) {
  				return elem.getAttribute("id") === attrId;
  			};
  		};
  	} else {
  		delete Expr.find["ID"];
  
  		Expr.filter["ID"] =  function( id ) {
  			var attrId = id.replace( runescape, funescape );
  			return function( elem ) {
  				var node = typeof elem.getAttributeNode !== strundefined && elem.getAttributeNode("id");
  				return node && node.value === attrId;
  			};
  		};
  	}
  
  	Expr.find["TAG"] = support.getElementsByTagName ?
  		function( tag, context ) {
  			if ( typeof context.getElementsByTagName !== strundefined ) {
  				return context.getElementsByTagName( tag );
  			}
  		} :
  		function( tag, context ) {
  			var elem,
  				tmp = [],
  				i = 0,
  				results = context.getElementsByTagName( tag );
  
  			if ( tag === "*" ) {
  				while ( (elem = results[i++]) ) {
  					if ( elem.nodeType === 1 ) {
  						tmp.push( elem );
  					}
  				}
  
  				return tmp;
  			}
  			return results;
  		};
  
  	Expr.find["CLASS"] = support.getElementsByClassName && function( className, context ) {
  		if ( typeof context.getElementsByClassName !== strundefined && documentIsHTML ) {
  			return context.getElementsByClassName( className );
  		}
  	};
  
  	/* QSA/matchesSelector
  	---------------------------------------------------------------------- */
  
  
  	rbuggyMatches = [];
  
  	rbuggyQSA = [];
  
  	if ( (support.qsa = rnative.test( doc.querySelectorAll )) ) {
  		assert(function( div ) {
  			div.innerHTML = "<select t=''><option selected=''></option></select>";
  
  			if ( div.querySelectorAll("[t^='']").length ) {
  				rbuggyQSA.push( "[*^$]=" + whitespace + "*(?:''|\"\")" );
  			}
  
  			if ( !div.querySelectorAll("[selected]").length ) {
  				rbuggyQSA.push( "\\[" + whitespace + "*(?:value|" + booleans + ")" );
  			}
  
  			if ( !div.querySelectorAll(":checked").length ) {
  				rbuggyQSA.push(":checked");
  			}
  		});
  
  		assert(function( div ) {
  			var input = doc.createElement("input");
  			input.setAttribute( "type", "hidden" );
  			div.appendChild( input ).setAttribute( "name", "D" );
  
  			if ( div.querySelectorAll("[name=d]").length ) {
  				rbuggyQSA.push( "name" + whitespace + "*[*^$|!~]?=" );
  			}
  
  			if ( !div.querySelectorAll(":enabled").length ) {
  				rbuggyQSA.push( ":enabled", ":disabled" );
  			}
  
  			div.querySelectorAll("*,:x");
  			rbuggyQSA.push(",.*:");
  		});
  	}
  
  	if ( (support.matchesSelector = rnative.test( (matches = docElem.webkitMatchesSelector ||
  		docElem.mozMatchesSelector ||
  		docElem.oMatchesSelector ||
  		docElem.msMatchesSelector) )) ) {
  
  		assert(function( div ) {
  			support.disconnectedMatch = matches.call( div, "div" );
  
  			matches.call( div, "[s!='']:x" );
  			rbuggyMatches.push( "!=", pseudos );
  		});
  	}
  
  	rbuggyQSA = rbuggyQSA.length && new RegExp( rbuggyQSA.join("|") );
  	rbuggyMatches = rbuggyMatches.length && new RegExp( rbuggyMatches.join("|") );
  
  	/* Contains
  	---------------------------------------------------------------------- */
  	hasCompare = rnative.test( docElem.compareDocumentPosition );
  
  	contains = hasCompare || rnative.test( docElem.contains ) ?
  		function( a, b ) {
  			var adown = a.nodeType === 9 ? a.documentElement : a,
  				bup = b && b.parentNode;
  			return a === bup || !!( bup && bup.nodeType === 1 && (
  				adown.contains ?
  					adown.contains( bup ) :
  					a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
  			));
  		} :
  		function( a, b ) {
  			if ( b ) {
  				while ( (b = b.parentNode) ) {
  					if ( b === a ) {
  						return true;
  					}
  				}
  			}
  			return false;
  		};
  
  	/* Sorting
  	---------------------------------------------------------------------- */
  
  	sortOrder = hasCompare ?
  	function( a, b ) {
  
  		if ( a === b ) {
  			hasDuplicate = true;
  			return 0;
  		}
  
  		var compare = !a.compareDocumentPosition - !b.compareDocumentPosition;
  		if ( compare ) {
  			return compare;
  		}
  
  		compare = ( a.ownerDocument || a ) === ( b.ownerDocument || b ) ?
  			a.compareDocumentPosition( b ) :
  
  			1;
  
  		if ( compare & 1 ||
  			(!support.sortDetached && b.compareDocumentPosition( a ) === compare) ) {
  
  			if ( a === doc || a.ownerDocument === preferredDoc && contains(preferredDoc, a) ) {
  				return -1;
  			}
  			if ( b === doc || b.ownerDocument === preferredDoc && contains(preferredDoc, b) ) {
  				return 1;
  			}
  
  			return sortInput ?
  				( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
  				0;
  		}
  
  		return compare & 4 ? -1 : 1;
  	} :
  	function( a, b ) {
  		if ( a === b ) {
  			hasDuplicate = true;
  			return 0;
  		}
  
  		var cur,
  			i = 0,
  			aup = a.parentNode,
  			bup = b.parentNode,
  			ap = [ a ],
  			bp = [ b ];
  
  		if ( !aup || !bup ) {
  			return a === doc ? -1 :
  				b === doc ? 1 :
  				aup ? -1 :
  				bup ? 1 :
  				sortInput ?
  				( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
  				0;
  
  		} else if ( aup === bup ) {
  			return siblingCheck( a, b );
  		}
  
  		cur = a;
  		while ( (cur = cur.parentNode) ) {
  			ap.unshift( cur );
  		}
  		cur = b;
  		while ( (cur = cur.parentNode) ) {
  			bp.unshift( cur );
  		}
  
  		while ( ap[i] === bp[i] ) {
  			i++;
  		}
  
  		return i ?
  			siblingCheck( ap[i], bp[i] ) :
  
  			ap[i] === preferredDoc ? -1 :
  			bp[i] === preferredDoc ? 1 :
  			0;
  	};
  
  	return doc;
  };
  
  Sizzle.matches = function( expr, elements ) {
  	return Sizzle( expr, null, null, elements );
  };
  
  Sizzle.matchesSelector = function( elem, expr ) {
  	if ( ( elem.ownerDocument || elem ) !== document ) {
  		setDocument( elem );
  	}
  
  	expr = expr.replace( rattributeQuotes, "='$1']" );
  
  	if ( support.matchesSelector && documentIsHTML &&
  		( !rbuggyMatches || !rbuggyMatches.test( expr ) ) &&
  		( !rbuggyQSA     || !rbuggyQSA.test( expr ) ) ) {
  
  		try {
  			var ret = matches.call( elem, expr );
  
  			if ( ret || support.disconnectedMatch ||
  					elem.document && elem.document.nodeType !== 11 ) {
  				return ret;
  			}
  		} catch(e) {}
  	}
  
  	return Sizzle( expr, document, null, [elem] ).length > 0;
  };
  
  Sizzle.contains = function( context, elem ) {
  	if ( ( context.ownerDocument || context ) !== document ) {
  		setDocument( context );
  	}
  	return contains( context, elem );
  };
  
  Sizzle.attr = function( elem, name ) {
  	if ( ( elem.ownerDocument || elem ) !== document ) {
  		setDocument( elem );
  	}
  
  	var fn = Expr.attrHandle[ name.toLowerCase() ],
  		val = fn && hasOwn.call( Expr.attrHandle, name.toLowerCase() ) ?
  			fn( elem, name, !documentIsHTML ) :
  			undefined;
  
  	return val !== undefined ?
  		val :
  		support.attributes || !documentIsHTML ?
  			elem.getAttribute( name ) :
  			(val = elem.getAttributeNode(name)) && val.specified ?
  				val.value :
  				null;
  };
  
  Sizzle.error = function( msg ) {
  	throw new Error( "Syntax error, unrecognized expression: " + msg );
  };
  
  /**
   * Document sorting and removing duplicates
   * @param {ArrayLike} results
   */
  Sizzle.uniqueSort = function( results ) {
  	var elem,
  		duplicates = [],
  		j = 0,
  		i = 0;
  
  	hasDuplicate = !support.detectDuplicates;
  	sortInput = !support.sortStable && results.slice( 0 );
  	results.sort( sortOrder );
  
  	if ( hasDuplicate ) {
  		while ( (elem = results[i++]) ) {
  			if ( elem === results[ i ] ) {
  				j = duplicates.push( i );
  			}
  		}
  		while ( j-- ) {
  			results.splice( duplicates[ j ], 1 );
  		}
  	}
  
  	sortInput = null;
  
  	return results;
  };
  
  /**
   * Utility function for retrieving the text value of an array of DOM nodes
   * @param {Array|Element} elem
   */
  getText = Sizzle.getText = function( elem ) {
  	var node,
  		ret = "",
  		i = 0,
  		nodeType = elem.nodeType;
  
  	if ( !nodeType ) {
  		while ( (node = elem[i++]) ) {
  			ret += getText( node );
  		}
  	} else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
  		if ( typeof elem.textContent === "string" ) {
  			return elem.textContent;
  		} else {
  			for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
  				ret += getText( elem );
  			}
  		}
  	} else if ( nodeType === 3 || nodeType === 4 ) {
  		return elem.nodeValue;
  	}
  
  	return ret;
  };
  
  Expr = Sizzle.selectors = {
  
  	cacheLength: 50,
  
  	createPseudo: markFunction,
  
  	match: matchExpr,
  
  	attrHandle: {},
  
  	find: {},
  
  	relative: {
  		">": { dir: "parentNode", first: true },
  		" ": { dir: "parentNode" },
  		"+": { dir: "previousSibling", first: true },
  		"~": { dir: "previousSibling" }
  	},
  
  	preFilter: {
  		"ATTR": function( match ) {
  			match[1] = match[1].replace( runescape, funescape );
  
  			match[3] = ( match[4] || match[5] || "" ).replace( runescape, funescape );
  
  			if ( match[2] === "~=" ) {
  				match[3] = " " + match[3] + " ";
  			}
  
  			return match.slice( 0, 4 );
  		},
  
  		"CHILD": function( match ) {
  			/* matches from matchExpr["CHILD"]
  				1 type (only|nth|...)
  				2 what (child|of-type)
  				3 argument (even|odd|\d*|\d*n([+-]\d+)?|...)
  				4 xn-component of xn+y argument ([+-]?\d*n|)
  				5 sign of xn-component
  				6 x of xn-component
  				7 sign of y-component
  				8 y of y-component
  			*/
  			match[1] = match[1].toLowerCase();
  
  			if ( match[1].slice( 0, 3 ) === "nth" ) {
  				if ( !match[3] ) {
  					Sizzle.error( match[0] );
  				}
  
  				match[4] = +( match[4] ? match[5] + (match[6] || 1) : 2 * ( match[3] === "even" || match[3] === "odd" ) );
  				match[5] = +( ( match[7] + match[8] ) || match[3] === "odd" );
  
  			} else if ( match[3] ) {
  				Sizzle.error( match[0] );
  			}
  
  			return match;
  		},
  
  		"PSEUDO": function( match ) {
  			var excess,
  				unquoted = !match[5] && match[2];
  
  			if ( matchExpr["CHILD"].test( match[0] ) ) {
  				return null;
  			}
  
  			if ( match[3] && match[4] !== undefined ) {
  				match[2] = match[4];
  
  			} else if ( unquoted && rpseudo.test( unquoted ) &&
  				(excess = tokenize( unquoted, true )) &&
  				(excess = unquoted.indexOf( ")", unquoted.length - excess ) - unquoted.length) ) {
  
  				match[0] = match[0].slice( 0, excess );
  				match[2] = unquoted.slice( 0, excess );
  			}
  
  			return match.slice( 0, 3 );
  		}
  	},
  
  	filter: {
  
  		"TAG": function( nodeNameSelector ) {
  			var nodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
  			return nodeNameSelector === "*" ?
  				function() { return true; } :
  				function( elem ) {
  					return elem.nodeName && elem.nodeName.toLowerCase() === nodeName;
  				};
  		},
  
  		"CLASS": function( className ) {
  			var pattern = classCache[ className + " " ];
  
  			return pattern ||
  				(pattern = new RegExp( "(^|" + whitespace + ")" + className + "(" + whitespace + "|$)" )) &&
  				classCache( className, function( elem ) {
  					return pattern.test( typeof elem.className === "string" && elem.className || typeof elem.getAttribute !== strundefined && elem.getAttribute("class") || "" );
  				});
  		},
  
  		"ATTR": function( name, operator, check ) {
  			return function( elem ) {
  				var result = Sizzle.attr( elem, name );
  
  				if ( result == null ) {
  					return operator === "!=";
  				}
  				if ( !operator ) {
  					return true;
  				}
  
  				result += "";
  
  				return operator === "=" ? result === check :
  					operator === "!=" ? result !== check :
  					operator === "^=" ? check && result.indexOf( check ) === 0 :
  					operator === "*=" ? check && result.indexOf( check ) > -1 :
  					operator === "$=" ? check && result.slice( -check.length ) === check :
  					operator === "~=" ? ( " " + result + " " ).indexOf( check ) > -1 :
  					operator === "|=" ? result === check || result.slice( 0, check.length + 1 ) === check + "-" :
  					false;
  			};
  		},
  
  		"CHILD": function( type, what, argument, first, last ) {
  			var simple = type.slice( 0, 3 ) !== "nth",
  				forward = type.slice( -4 ) !== "last",
  				ofType = what === "of-type";
  
  			return first === 1 && last === 0 ?
  
  				function( elem ) {
  					return !!elem.parentNode;
  				} :
  
  				function( elem, context, xml ) {
  					var cache, outerCache, node, diff, nodeIndex, start,
  						dir = simple !== forward ? "nextSibling" : "previousSibling",
  						parent = elem.parentNode,
  						name = ofType && elem.nodeName.toLowerCase(),
  						useCache = !xml && !ofType;
  
  					if ( parent ) {
  
  						if ( simple ) {
  							while ( dir ) {
  								node = elem;
  								while ( (node = node[ dir ]) ) {
  									if ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) {
  										return false;
  									}
  								}
  								start = dir = type === "only" && !start && "nextSibling";
  							}
  							return true;
  						}
  
  						start = [ forward ? parent.firstChild : parent.lastChild ];
  
  						if ( forward && useCache ) {
  							outerCache = parent[ expando ] || (parent[ expando ] = {});
  							cache = outerCache[ type ] || [];
  							nodeIndex = cache[0] === dirruns && cache[1];
  							diff = cache[0] === dirruns && cache[2];
  							node = nodeIndex && parent.childNodes[ nodeIndex ];
  
  							while ( (node = ++nodeIndex && node && node[ dir ] ||
  
  								(diff = nodeIndex = 0) || start.pop()) ) {
  
  								if ( node.nodeType === 1 && ++diff && node === elem ) {
  									outerCache[ type ] = [ dirruns, nodeIndex, diff ];
  									break;
  								}
  							}
  
  						} else if ( useCache && (cache = (elem[ expando ] || (elem[ expando ] = {}))[ type ]) && cache[0] === dirruns ) {
  							diff = cache[1];
  
  						} else {
  							while ( (node = ++nodeIndex && node && node[ dir ] ||
  								(diff = nodeIndex = 0) || start.pop()) ) {
  
  								if ( ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) && ++diff ) {
  									if ( useCache ) {
  										(node[ expando ] || (node[ expando ] = {}))[ type ] = [ dirruns, diff ];
  									}
  
  									if ( node === elem ) {
  										break;
  									}
  								}
  							}
  						}
  
  						diff -= last;
  						return diff === first || ( diff % first === 0 && diff / first >= 0 );
  					}
  				};
  		},
  
  		"PSEUDO": function( pseudo, argument ) {
  			var args,
  				fn = Expr.pseudos[ pseudo ] || Expr.setFilters[ pseudo.toLowerCase() ] ||
  					Sizzle.error( "unsupported pseudo: " + pseudo );
  
  			if ( fn[ expando ] ) {
  				return fn( argument );
  			}
  
  			if ( fn.length > 1 ) {
  				args = [ pseudo, pseudo, "", argument ];
  				return Expr.setFilters.hasOwnProperty( pseudo.toLowerCase() ) ?
  					markFunction(function( seed, matches ) {
  						var idx,
  							matched = fn( seed, argument ),
  							i = matched.length;
  						while ( i-- ) {
  							idx = indexOf.call( seed, matched[i] );
  							seed[ idx ] = !( matches[ idx ] = matched[i] );
  						}
  					}) :
  					function( elem ) {
  						return fn( elem, 0, args );
  					};
  			}
  
  			return fn;
  		}
  	},
  
  	pseudos: {
  		"not": markFunction(function( selector ) {
  			var input = [],
  				results = [],
  				matcher = compile( selector.replace( rtrim, "$1" ) );
  
  			return matcher[ expando ] ?
  				markFunction(function( seed, matches, context, xml ) {
  					var elem,
  						unmatched = matcher( seed, null, xml, [] ),
  						i = seed.length;
  
  					while ( i-- ) {
  						if ( (elem = unmatched[i]) ) {
  							seed[i] = !(matches[i] = elem);
  						}
  					}
  				}) :
  				function( elem, context, xml ) {
  					input[0] = elem;
  					matcher( input, null, xml, results );
  					return !results.pop();
  				};
  		}),
  
  		"has": markFunction(function( selector ) {
  			return function( elem ) {
  				return Sizzle( selector, elem ).length > 0;
  			};
  		}),
  
  		"contains": markFunction(function( text ) {
  			return function( elem ) {
  				return ( elem.textContent || elem.innerText || getText( elem ) ).indexOf( text ) > -1;
  			};
  		}),
  
  		"lang": markFunction( function( lang ) {
  			if ( !ridentifier.test(lang || "") ) {
  				Sizzle.error( "unsupported lang: " + lang );
  			}
  			lang = lang.replace( runescape, funescape ).toLowerCase();
  			return function( elem ) {
  				var elemLang;
  				do {
  					if ( (elemLang = documentIsHTML ?
  						elem.lang :
  						elem.getAttribute("xml:lang") || elem.getAttribute("lang")) ) {
  
  						elemLang = elemLang.toLowerCase();
  						return elemLang === lang || elemLang.indexOf( lang + "-" ) === 0;
  					}
  				} while ( (elem = elem.parentNode) && elem.nodeType === 1 );
  				return false;
  			};
  		}),
  
  		"target": function( elem ) {
  			var hash = window.location && window.location.hash;
  			return hash && hash.slice( 1 ) === elem.id;
  		},
  
  		"root": function( elem ) {
  			return elem === docElem;
  		},
  
  		"focus": function( elem ) {
  			return elem === document.activeElement && (!document.hasFocus || document.hasFocus()) && !!(elem.type || elem.href || ~elem.tabIndex);
  		},
  
  		"enabled": function( elem ) {
  			return elem.disabled === false;
  		},
  
  		"disabled": function( elem ) {
  			return elem.disabled === true;
  		},
  
  		"checked": function( elem ) {
  			var nodeName = elem.nodeName.toLowerCase();
  			return (nodeName === "input" && !!elem.checked) || (nodeName === "option" && !!elem.selected);
  		},
  
  		"selected": function( elem ) {
  			if ( elem.parentNode ) {
  				elem.parentNode.selectedIndex;
  			}
  
  			return elem.selected === true;
  		},
  
  		"empty": function( elem ) {
  			for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
  				if ( elem.nodeType < 6 ) {
  					return false;
  				}
  			}
  			return true;
  		},
  
  		"parent": function( elem ) {
  			return !Expr.pseudos["empty"]( elem );
  		},
  
  		"header": function( elem ) {
  			return rheader.test( elem.nodeName );
  		},
  
  		"input": function( elem ) {
  			return rinputs.test( elem.nodeName );
  		},
  
  		"button": function( elem ) {
  			var name = elem.nodeName.toLowerCase();
  			return name === "input" && elem.type === "button" || name === "button";
  		},
  
  		"text": function( elem ) {
  			var attr;
  			return elem.nodeName.toLowerCase() === "input" &&
  				elem.type === "text" &&
  
  				( (attr = elem.getAttribute("type")) == null || attr.toLowerCase() === "text" );
  		},
  
  		"first": createPositionalPseudo(function() {
  			return [ 0 ];
  		}),
  
  		"last": createPositionalPseudo(function( matchIndexes, length ) {
  			return [ length - 1 ];
  		}),
  
  		"eq": createPositionalPseudo(function( matchIndexes, length, argument ) {
  			return [ argument < 0 ? argument + length : argument ];
  		}),
  
  		"even": createPositionalPseudo(function( matchIndexes, length ) {
  			var i = 0;
  			for ( ; i < length; i += 2 ) {
  				matchIndexes.push( i );
  			}
  			return matchIndexes;
  		}),
  
  		"odd": createPositionalPseudo(function( matchIndexes, length ) {
  			var i = 1;
  			for ( ; i < length; i += 2 ) {
  				matchIndexes.push( i );
  			}
  			return matchIndexes;
  		}),
  
  		"lt": createPositionalPseudo(function( matchIndexes, length, argument ) {
  			var i = argument < 0 ? argument + length : argument;
  			for ( ; --i >= 0; ) {
  				matchIndexes.push( i );
  			}
  			return matchIndexes;
  		}),
  
  		"gt": createPositionalPseudo(function( matchIndexes, length, argument ) {
  			var i = argument < 0 ? argument + length : argument;
  			for ( ; ++i < length; ) {
  				matchIndexes.push( i );
  			}
  			return matchIndexes;
  		})
  	}
  };
  
  Expr.pseudos["nth"] = Expr.pseudos["eq"];
  
  for ( i in { radio: true, checkbox: true, file: true, password: true, image: true } ) {
  	Expr.pseudos[ i ] = createInputPseudo( i );
  }
  for ( i in { submit: true, reset: true } ) {
  	Expr.pseudos[ i ] = createButtonPseudo( i );
  }
  
  function setFilters() {}
  setFilters.prototype = Expr.filters = Expr.pseudos;
  Expr.setFilters = new setFilters();
  
  function tokenize( selector, parseOnly ) {
  	var matched, match, tokens, type,
  		soFar, groups, preFilters,
  		cached = tokenCache[ selector + " " ];
  
  	if ( cached ) {
  		return parseOnly ? 0 : cached.slice( 0 );
  	}
  
  	soFar = selector;
  	groups = [];
  	preFilters = Expr.preFilter;
  
  	while ( soFar ) {
  
  		if ( !matched || (match = rcomma.exec( soFar )) ) {
  			if ( match ) {
  				soFar = soFar.slice( match[0].length ) || soFar;
  			}
  			groups.push( (tokens = []) );
  		}
  
  		matched = false;
  
  		if ( (match = rcombinators.exec( soFar )) ) {
  			matched = match.shift();
  			tokens.push({
  				value: matched,
  				type: match[0].replace( rtrim, " " )
  			});
  			soFar = soFar.slice( matched.length );
  		}
  
  		for ( type in Expr.filter ) {
  			if ( (match = matchExpr[ type ].exec( soFar )) && (!preFilters[ type ] ||
  				(match = preFilters[ type ]( match ))) ) {
  				matched = match.shift();
  				tokens.push({
  					value: matched,
  					type: type,
  					matches: match
  				});
  				soFar = soFar.slice( matched.length );
  			}
  		}
  
  		if ( !matched ) {
  			break;
  		}
  	}
  
  	return parseOnly ?
  		soFar.length :
  		soFar ?
  			Sizzle.error( selector ) :
  			tokenCache( selector, groups ).slice( 0 );
  }
  
  function toSelector( tokens ) {
  	var i = 0,
  		len = tokens.length,
  		selector = "";
  	for ( ; i < len; i++ ) {
  		selector += tokens[i].value;
  	}
  	return selector;
  }
  
  function addCombinator( matcher, combinator, base ) {
  	var dir = combinator.dir,
  		checkNonElements = base && dir === "parentNode",
  		doneName = done++;
  
  	return combinator.first ?
  		function( elem, context, xml ) {
  			while ( (elem = elem[ dir ]) ) {
  				if ( elem.nodeType === 1 || checkNonElements ) {
  					return matcher( elem, context, xml );
  				}
  			}
  		} :
  
  		function( elem, context, xml ) {
  			var oldCache, outerCache,
  				newCache = [ dirruns, doneName ];
  
  			if ( xml ) {
  				while ( (elem = elem[ dir ]) ) {
  					if ( elem.nodeType === 1 || checkNonElements ) {
  						if ( matcher( elem, context, xml ) ) {
  							return true;
  						}
  					}
  				}
  			} else {
  				while ( (elem = elem[ dir ]) ) {
  					if ( elem.nodeType === 1 || checkNonElements ) {
  						outerCache = elem[ expando ] || (elem[ expando ] = {});
  						if ( (oldCache = outerCache[ dir ]) &&
  							oldCache[ 0 ] === dirruns && oldCache[ 1 ] === doneName ) {
  
  							return (newCache[ 2 ] = oldCache[ 2 ]);
  						} else {
  							outerCache[ dir ] = newCache;
  
  							if ( (newCache[ 2 ] = matcher( elem, context, xml )) ) {
  								return true;
  							}
  						}
  					}
  				}
  			}
  		};
  }
  
  function elementMatcher( matchers ) {
  	return matchers.length > 1 ?
  		function( elem, context, xml ) {
  			var i = matchers.length;
  			while ( i-- ) {
  				if ( !matchers[i]( elem, context, xml ) ) {
  					return false;
  				}
  			}
  			return true;
  		} :
  		matchers[0];
  }
  
  function multipleContexts( selector, contexts, results ) {
  	var i = 0,
  		len = contexts.length;
  	for ( ; i < len; i++ ) {
  		Sizzle( selector, contexts[i], results );
  	}
  	return results;
  }
  
  function condense( unmatched, map, filter, context, xml ) {
  	var elem,
  		newUnmatched = [],
  		i = 0,
  		len = unmatched.length,
  		mapped = map != null;
  
  	for ( ; i < len; i++ ) {
  		if ( (elem = unmatched[i]) ) {
  			if ( !filter || filter( elem, context, xml ) ) {
  				newUnmatched.push( elem );
  				if ( mapped ) {
  					map.push( i );
  				}
  			}
  		}
  	}
  
  	return newUnmatched;
  }
  
  function setMatcher( preFilter, selector, matcher, postFilter, postFinder, postSelector ) {
  	if ( postFilter && !postFilter[ expando ] ) {
  		postFilter = setMatcher( postFilter );
  	}
  	if ( postFinder && !postFinder[ expando ] ) {
  		postFinder = setMatcher( postFinder, postSelector );
  	}
  	return markFunction(function( seed, results, context, xml ) {
  		var temp, i, elem,
  			preMap = [],
  			postMap = [],
  			preexisting = results.length,
  
  			elems = seed || multipleContexts( selector || "*", context.nodeType ? [ context ] : context, [] ),
  
  			matcherIn = preFilter && ( seed || !selector ) ?
  				condense( elems, preMap, preFilter, context, xml ) :
  				elems,
  
  			matcherOut = matcher ?
  				postFinder || ( seed ? preFilter : preexisting || postFilter ) ?
  
  					[] :
  
  					results :
  				matcherIn;
  
  		if ( matcher ) {
  			matcher( matcherIn, matcherOut, context, xml );
  		}
  
  		if ( postFilter ) {
  			temp = condense( matcherOut, postMap );
  			postFilter( temp, [], context, xml );
  
  			i = temp.length;
  			while ( i-- ) {
  				if ( (elem = temp[i]) ) {
  					matcherOut[ postMap[i] ] = !(matcherIn[ postMap[i] ] = elem);
  				}
  			}
  		}
  
  		if ( seed ) {
  			if ( postFinder || preFilter ) {
  				if ( postFinder ) {
  					temp = [];
  					i = matcherOut.length;
  					while ( i-- ) {
  						if ( (elem = matcherOut[i]) ) {
  							temp.push( (matcherIn[i] = elem) );
  						}
  					}
  					postFinder( null, (matcherOut = []), temp, xml );
  				}
  
  				i = matcherOut.length;
  				while ( i-- ) {
  					if ( (elem = matcherOut[i]) &&
  						(temp = postFinder ? indexOf.call( seed, elem ) : preMap[i]) > -1 ) {
  
  						seed[temp] = !(results[temp] = elem);
  					}
  				}
  			}
  
  		} else {
  			matcherOut = condense(
  				matcherOut === results ?
  					matcherOut.splice( preexisting, matcherOut.length ) :
  					matcherOut
  			);
  			if ( postFinder ) {
  				postFinder( null, results, matcherOut, xml );
  			} else {
  				push.apply( results, matcherOut );
  			}
  		}
  	});
  }
  
  function matcherFromTokens( tokens ) {
  	var checkContext, matcher, j,
  		len = tokens.length,
  		leadingRelative = Expr.relative[ tokens[0].type ],
  		implicitRelative = leadingRelative || Expr.relative[" "],
  		i = leadingRelative ? 1 : 0,
  
  		matchContext = addCombinator( function( elem ) {
  			return elem === checkContext;
  		}, implicitRelative, true ),
  		matchAnyContext = addCombinator( function( elem ) {
  			return indexOf.call( checkContext, elem ) > -1;
  		}, implicitRelative, true ),
  		matchers = [ function( elem, context, xml ) {
  			return ( !leadingRelative && ( xml || context !== outermostContext ) ) || (
  				(checkContext = context).nodeType ?
  					matchContext( elem, context, xml ) :
  					matchAnyContext( elem, context, xml ) );
  		} ];
  
  	for ( ; i < len; i++ ) {
  		if ( (matcher = Expr.relative[ tokens[i].type ]) ) {
  			matchers = [ addCombinator(elementMatcher( matchers ), matcher) ];
  		} else {
  			matcher = Expr.filter[ tokens[i].type ].apply( null, tokens[i].matches );
  
  			if ( matcher[ expando ] ) {
  				j = ++i;
  				for ( ; j < len; j++ ) {
  					if ( Expr.relative[ tokens[j].type ] ) {
  						break;
  					}
  				}
  				return setMatcher(
  					i > 1 && elementMatcher( matchers ),
  					i > 1 && toSelector(
  						tokens.slice( 0, i - 1 ).concat({ value: tokens[ i - 2 ].type === " " ? "*" : "" })
  					).replace( rtrim, "$1" ),
  					matcher,
  					i < j && matcherFromTokens( tokens.slice( i, j ) ),
  					j < len && matcherFromTokens( (tokens = tokens.slice( j )) ),
  					j < len && toSelector( tokens )
  				);
  			}
  			matchers.push( matcher );
  		}
  	}
  
  	return elementMatcher( matchers );
  }
  
  function matcherFromGroupMatchers( elementMatchers, setMatchers ) {
  	var bySet = setMatchers.length > 0,
  		byElement = elementMatchers.length > 0,
  		superMatcher = function( seed, context, xml, results, outermost ) {
  			var elem, j, matcher,
  				matchedCount = 0,
  				i = "0",
  				unmatched = seed && [],
  				setMatched = [],
  				contextBackup = outermostContext,
  				elems = seed || byElement && Expr.find["TAG"]( "*", outermost ),
  				dirrunsUnique = (dirruns += contextBackup == null ? 1 : Math.random() || 0.1),
  				len = elems.length;
  
  			if ( outermost ) {
  				outermostContext = context !== document && context;
  			}
  
  			for ( ; i !== len && (elem = elems[i]) != null; i++ ) {
  				if ( byElement && elem ) {
  					j = 0;
  					while ( (matcher = elementMatchers[j++]) ) {
  						if ( matcher( elem, context, xml ) ) {
  							results.push( elem );
  							break;
  						}
  					}
  					if ( outermost ) {
  						dirruns = dirrunsUnique;
  					}
  				}
  
  				if ( bySet ) {
  					if ( (elem = !matcher && elem) ) {
  						matchedCount--;
  					}
  
  					if ( seed ) {
  						unmatched.push( elem );
  					}
  				}
  			}
  
  			matchedCount += i;
  			if ( bySet && i !== matchedCount ) {
  				j = 0;
  				while ( (matcher = setMatchers[j++]) ) {
  					matcher( unmatched, setMatched, context, xml );
  				}
  
  				if ( seed ) {
  					if ( matchedCount > 0 ) {
  						while ( i-- ) {
  							if ( !(unmatched[i] || setMatched[i]) ) {
  								setMatched[i] = pop.call( results );
  							}
  						}
  					}
  
  					setMatched = condense( setMatched );
  				}
  
  				push.apply( results, setMatched );
  
  				if ( outermost && !seed && setMatched.length > 0 &&
  					( matchedCount + setMatchers.length ) > 1 ) {
  
  					Sizzle.uniqueSort( results );
  				}
  			}
  
  			if ( outermost ) {
  				dirruns = dirrunsUnique;
  				outermostContext = contextBackup;
  			}
  
  			return unmatched;
  		};
  
  	return bySet ?
  		markFunction( superMatcher ) :
  		superMatcher;
  }
  
  compile = Sizzle.compile = function( selector, match /* Internal Use Only */ ) {
  	var i,
  		setMatchers = [],
  		elementMatchers = [],
  		cached = compilerCache[ selector + " " ];
  
  	if ( !cached ) {
  		if ( !match ) {
  			match = tokenize( selector );
  		}
  		i = match.length;
  		while ( i-- ) {
  			cached = matcherFromTokens( match[i] );
  			if ( cached[ expando ] ) {
  				setMatchers.push( cached );
  			} else {
  				elementMatchers.push( cached );
  			}
  		}
  
  		cached = compilerCache( selector, matcherFromGroupMatchers( elementMatchers, setMatchers ) );
  
  		cached.selector = selector;
  	}
  	return cached;
  };
  
  /**
   * A low-level selection function that works with Sizzle's compiled
   *  selector functions
   * @param {String|Function} selector A selector or a pre-compiled
   *  selector function built with Sizzle.compile
   * @param {Element} context
   * @param {Array} [results]
   * @param {Array} [seed] A set of elements to match against
   */
  select = Sizzle.select = function( selector, context, results, seed ) {
  	var i, tokens, token, type, find,
  		compiled = typeof selector === "function" && selector,
  		match = !seed && tokenize( (selector = compiled.selector || selector) );
  
  	results = results || [];
  
  	if ( match.length === 1 ) {
  
  		tokens = match[0] = match[0].slice( 0 );
  		if ( tokens.length > 2 && (token = tokens[0]).type === "ID" &&
  				support.getById && context.nodeType === 9 && documentIsHTML &&
  				Expr.relative[ tokens[1].type ] ) {
  
  			context = ( Expr.find["ID"]( token.matches[0].replace(runescape, funescape), context ) || [] )[0];
  			if ( !context ) {
  				return results;
  
  			} else if ( compiled ) {
  				context = context.parentNode;
  			}
  
  			selector = selector.slice( tokens.shift().value.length );
  		}
  
  		i = matchExpr["needsContext"].test( selector ) ? 0 : tokens.length;
  		while ( i-- ) {
  			token = tokens[i];
  
  			if ( Expr.relative[ (type = token.type) ] ) {
  				break;
  			}
  			if ( (find = Expr.find[ type ]) ) {
  				if ( (seed = find(
  					token.matches[0].replace( runescape, funescape ),
  					rsibling.test( tokens[0].type ) && testContext( context.parentNode ) || context
  				)) ) {
  
  					tokens.splice( i, 1 );
  					selector = seed.length && toSelector( tokens );
  					if ( !selector ) {
  						push.apply( results, seed );
  						return results;
  					}
  
  					break;
  				}
  			}
  		}
  	}
  
  	( compiled || compile( selector, match ) )(
  		seed,
  		context,
  		!documentIsHTML,
  		results,
  		rsibling.test( selector ) && testContext( context.parentNode ) || context
  	);
  	return results;
  };
  
  
  support.sortStable = expando.split("").sort( sortOrder ).join("") === expando;
  
  support.detectDuplicates = !!hasDuplicate;
  
  setDocument();
  
  support.sortDetached = assert(function( div1 ) {
  	return div1.compareDocumentPosition( document.createElement("div") ) & 1;
  });
  
  if ( !assert(function( div ) {
  	div.innerHTML = "<a href='#'></a>";
  	return div.firstChild.getAttribute("href") === "#" ;
  }) ) {
  	addHandle( "type|href|height|width", function( elem, name, isXML ) {
  		if ( !isXML ) {
  			return elem.getAttribute( name, name.toLowerCase() === "type" ? 1 : 2 );
  		}
  	});
  }
  
  if ( !support.attributes || !assert(function( div ) {
  	div.innerHTML = "<input/>";
  	div.firstChild.setAttribute( "value", "" );
  	return div.firstChild.getAttribute( "value" ) === "";
  }) ) {
  	addHandle( "value", function( elem, name, isXML ) {
  		if ( !isXML && elem.nodeName.toLowerCase() === "input" ) {
  			return elem.defaultValue;
  		}
  	});
  }
  
  if ( !assert(function( div ) {
  	return div.getAttribute("disabled") == null;
  }) ) {
  	addHandle( booleans, function( elem, name, isXML ) {
  		var val;
  		if ( !isXML ) {
  			return elem[ name ] === true ? name.toLowerCase() :
  					(val = elem.getAttributeNode( name )) && val.specified ?
  					val.value :
  				null;
  		}
  	});
  }
  
  if ( typeof define === "function" && define.amd ) {
  	define(function() { return Sizzle; });
  } else if ( typeof module !== "undefined" && module.exports ) {
  	module.exports = Sizzle;
  } else {
  	window.Sizzle = Sizzle;
  }
  
  })( window );
  
  ;(function(engine) {
    var extendElements = Prototype.Selector.extendElements;
  
    function select(selector, scope) {
      return extendElements(engine(selector, scope || document));
    }
  
    function match(element, selector) {
      return engine.matches(selector, [element]).length == 1;
    }
  
    Prototype.Selector.engine = engine;
    Prototype.Selector.select = select;
    Prototype.Selector.match = match;
  })(Sizzle);
  
  window.Sizzle = Prototype._original_property;
  delete Prototype._original_property;
  
  var Form = {
    reset: function(form) {
      form = $(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, accumulator, initial;
  
      if (options.hash) {
        initial = {};
        accumulator = function(result, key, value) {
          if (key in result) {
            if (!Object.isArray(result[key])) result[key] = [result[key]];
            result[key] = result[key].concat(value);
          } else result[key] = value;
          return result;
        };
      } else {
        initial = '';
        accumulator = function(result, key, values) {
          if (!Object.isArray(values)) {values = [values];}
          if (!values.length) {return result;}
          var encodedKey = encodeURIComponent(key).gsub(/%20/, '+');
          return result + (result ? "&" : "") + values.map(function (value) {
            value = value.gsub(/(\r)?\n/, '\r\n');
            value = encodeURIComponent(value);
            value = value.gsub(/%20/, '+');
            return encodedKey + "=" + value;
          }).join("&");
        };
      }
  
      return elements.inject(initial, function(result, element) {
        if (!element.disabled && element.name) {
          key = element.name; value = $(element).getValue();
          if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
              submit !== false && (!submit || key == submit) && (submitted = true)))) {
            result = accumulator(result, key, value);
          }
        }
        return result;
      });
    }
  };
  
  Form.Methods = {
    serialize: function(form, options) {
      return Form.serializeElements(Form.getElements(form), options);
    },
  
  
    getElements: function(form) {
      var elements = $(form).getElementsByTagName('*');
      var element, results = [], serializers = Form.Element.Serializers;
  
      for (var i = 0; element = elements[i]; i++) {
        if (serializers[element.tagName.toLowerCase()])
          results.push(Element.extend(element));
      }
      return results;
    },
  
    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)$/i.test(element.tagName);
      });
    },
  
    focusFirstElement: function(form) {
      form = $(form);
      var element = form.findFirstElement();
      if (element) element.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 = $(element);
      try {
        element.focus();
        if (element.select && (element.tagName.toLowerCase() != 'input' ||
            !(/^(?:button|reset|submit)$/i.test(element.type))))
          element.select();
      } catch (e) { }
      return element;
    },
  
    disable: function(element) {
      element = $(element);
      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 = (function() {
    function input(element, value) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          return inputSelector(element, value);
        default:
          return valueSelector(element, value);
      }
    }
  
    function inputSelector(element, value) {
      if (Object.isUndefined(value))
        return element.checked ? element.value : null;
      else element.checked = !!value;
    }
  
    function valueSelector(element, value) {
      if (Object.isUndefined(value)) return element.value;
      else element.value = value;
    }
  
    function select(element, value) {
      if (Object.isUndefined(value))
        return (element.type === 'select-one' ? selectOne : selectMany)(element);
  
      var opt, currentValue, single = !Object.isArray(value);
      for (var i = 0, length = element.length; i < length; i++) {
        opt = element.options[i];
        currentValue = this.optionValue(opt);
        if (single) {
          if (currentValue == value) {
            opt.selected = true;
            return;
          }
        }
        else opt.selected = value.include(currentValue);
      }
    }
  
    function selectOne(element) {
      var index = element.selectedIndex;
      return index >= 0 ? optionValue(element.options[index]) : null;
    }
  
    function selectMany(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(optionValue(opt));
      }
      return values;
    }
  
    function optionValue(opt) {
      return Element.hasAttribute(opt, 'value') ? opt.value : opt.text;
    }
  
    return {
      input:         input,
      inputSelector: inputSelector,
      textarea:      valueSelector,
      select:        select,
      selectOne:     selectOne,
      selectMany:    selectMany,
      optionValue:   optionValue,
      button:        valueSelector
    };
  })();
  
  /*--------------------------------------------------------------------------*/
  
  
  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);
    }
  });
  (function(GLOBAL) {
    var DIV = document.createElement('div');
    var docEl = document.documentElement;
    var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
     && 'onmouseleave' in docEl;
  
    var 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
    };
  
  
    var isIELegacyEvent = function(event) { return false; };
  
    if (window.attachEvent) {
      if (window.addEventListener) {
        isIELegacyEvent = function(event) {
          return !(event instanceof window.Event);
        };
      } else {
        isIELegacyEvent = function(event) { return true; };
      }
    }
  
    var _isButton;
  
    function _isButtonForDOMEvents(event, code) {
      return event.which ? (event.which === code + 1) : (event.button === code);
    }
  
    var legacyButtonMap = { 0: 1, 1: 4, 2: 2 };
    function _isButtonForLegacyEvents(event, code) {
      return event.button === legacyButtonMap[code];
    }
  
    function _isButtonForWebKit(event, code) {
      switch (code) {
        case 0: return event.which == 1 && !event.metaKey;
        case 1: return event.which == 2 || (event.which == 1 && event.metaKey);
        case 2: return event.which == 3;
        default: return false;
      }
    }
  
    if (window.attachEvent) {
      if (!window.addEventListener) {
        _isButton = _isButtonForLegacyEvents;
      } else {
        _isButton = function(event, code) {
          return isIELegacyEvent(event) ? _isButtonForLegacyEvents(event, code) :
           _isButtonForDOMEvents(event, code);
        }
      }
    } else if (Prototype.Browser.WebKit) {
      _isButton = _isButtonForWebKit;
    } else {
      _isButton = _isButtonForDOMEvents;
    }
  
    function isLeftClick(event)   { return _isButton(event, 0) }
  
    function isMiddleClick(event) { return _isButton(event, 1) }
  
    function isRightClick(event)  { return _isButton(event, 2) }
  
    function element(event) {
      return Element.extend(_element(event));
    }
  
    function _element(event) {
      event = Event.extend(event);
  
      var node = event.target, type = event.type,
       currentTarget = event.currentTarget;
  
      if (currentTarget && currentTarget.tagName) {
        if (type === 'load' || type === 'error' ||
          (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
            && currentTarget.type === 'radio'))
              node = currentTarget;
      }
  
      return node.nodeType == Node.TEXT_NODE ? node.parentNode : node;
    }
  
    function findElement(event, expression) {
      var element = _element(event), selector = Prototype.Selector;
      if (!expression) return Element.extend(element);
      while (element) {
        if (Object.isElement(element) && selector.match(element, expression))
          return Element.extend(element);
        element = element.parentNode;
      }
    }
  
    function pointer(event) {
      return { x: pointerX(event), y: pointerY(event) };
    }
  
    function pointerX(event) {
      var docElement = document.documentElement,
       body = document.body || { scrollLeft: 0 };
  
      return event.pageX || (event.clientX +
        (docElement.scrollLeft || body.scrollLeft) -
        (docElement.clientLeft || 0));
    }
  
    function pointerY(event) {
      var docElement = document.documentElement,
       body = document.body || { scrollTop: 0 };
  
      return  event.pageY || (event.clientY +
         (docElement.scrollTop || body.scrollTop) -
         (docElement.clientTop || 0));
    }
  
  
    function stop(event) {
      Event.extend(event);
      event.preventDefault();
      event.stopPropagation();
  
      event.stopped = true;
    }
  
  
    Event.Methods = {
      isLeftClick:   isLeftClick,
      isMiddleClick: isMiddleClick,
      isRightClick:  isRightClick,
  
      element:     element,
      findElement: findElement,
  
      pointer:  pointer,
      pointerX: pointerX,
      pointerY: pointerY,
  
      stop: stop
    };
  
    var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
      m[name] = Event.Methods[name].methodize();
      return m;
    });
  
    if (window.attachEvent) {
      function _relatedTarget(event) {
        var element;
        switch (event.type) {
          case 'mouseover':
          case 'mouseenter':
            element = event.fromElement;
            break;
          case 'mouseout':
          case 'mouseleave':
            element = event.toElement;
            break;
          default:
            return null;
        }
        return Element.extend(element);
      }
  
      var additionalMethods = {
        stopPropagation: function() { this.cancelBubble = true },
        preventDefault:  function() { this.returnValue = false },
        inspect: function() { return '[object Event]' }
      };
  
      Event.extend = function(event, element) {
        if (!event) return false;
  
        if (!isIELegacyEvent(event)) return event;
  
        if (event._extendedByPrototype) return event;
        event._extendedByPrototype = Prototype.emptyFunction;
  
        var pointer = Event.pointer(event);
  
        Object.extend(event, {
          target: event.srcElement || element,
          relatedTarget: _relatedTarget(event),
          pageX:  pointer.x,
          pageY:  pointer.y
        });
  
        Object.extend(event, methods);
        Object.extend(event, additionalMethods);
  
        return event;
      };
    } else {
      Event.extend = Prototype.K;
    }
  
    if (window.addEventListener) {
      Event.prototype = window.Event.prototype || document.createEvent('HTMLEvents').__proto__;
      Object.extend(Event.prototype, methods);
    }
  
    var EVENT_TRANSLATIONS = {
      mouseenter: 'mouseover',
      mouseleave: 'mouseout'
    };
  
    function getDOMEventName(eventName) {
      return EVENT_TRANSLATIONS[eventName] || eventName;
    }
  
    if (MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED)
      getDOMEventName = Prototype.K;
  
    function getUniqueElementID(element) {
      if (element === window) return 0;
  
      if (typeof element._prototypeUID === 'undefined')
        element._prototypeUID = Element.Storage.UID++;
      return element._prototypeUID;
    }
  
    function getUniqueElementID_IE(element) {
      if (element === window) return 0;
      if (element == document) return 1;
      return element.uniqueID;
    }
  
    if ('uniqueID' in DIV)
      getUniqueElementID = getUniqueElementID_IE;
  
    function isCustomEvent(eventName) {
      return eventName.include(':');
    }
  
    Event._isCustomEvent = isCustomEvent;
  
    function getRegistryForElement(element, uid) {
      var CACHE = GLOBAL.Event.cache;
      if (Object.isUndefined(uid))
        uid = getUniqueElementID(element);
      if (!CACHE[uid]) CACHE[uid] = { element: element };
      return CACHE[uid];
    }
  
    function destroyRegistryForElement(element, uid) {
      if (Object.isUndefined(uid))
        uid = getUniqueElementID(element);
      delete GLOBAL.Event.cache[uid];
    }
  
  
    function register(element, eventName, handler) {
      var registry = getRegistryForElement(element);
      if (!registry[eventName]) registry[eventName] = [];
      var entries = registry[eventName];
  
      var i = entries.length;
      while (i--)
        if (entries[i].handler === handler) return null;
  
      var uid = getUniqueElementID(element);
      var responder = GLOBAL.Event._createResponder(uid, eventName, handler);
      var entry = {
        responder: responder,
        handler:   handler
      };
  
      entries.push(entry);
      return entry;
    }
  
    function unregister(element, eventName, handler) {
      var registry = getRegistryForElement(element);
      var entries = registry[eventName];
      if (!entries) return;
  
      var i = entries.length, entry;
      while (i--) {
        if (entries[i].handler === handler) {
          entry = entries[i];
          break;
        }
      }
  
      if (!entry) return;
  
      var index = entries.indexOf(entry);
      entries.splice(index, 1);
  
      return entry;
    }
  
  
    function observe(element, eventName, handler) {
      element = $(element);
      var entry = register(element, eventName, handler);
  
      if (entry === null) return element;
  
      var responder = entry.responder;
      if (isCustomEvent(eventName))
        observeCustomEvent(element, eventName, responder);
      else
        observeStandardEvent(element, eventName, responder);
  
      return element;
    }
  
    function observeStandardEvent(element, eventName, responder) {
      var actualEventName = getDOMEventName(eventName);
      if (element.addEventListener) {
        element.addEventListener(actualEventName, responder, false);
      } else {
        element.attachEvent('on' + actualEventName, responder);
      }
    }
  
    function observeCustomEvent(element, eventName, responder) {
      if (element.addEventListener) {
        element.addEventListener('dataavailable', responder, false);
      } else {
        element.attachEvent('ondataavailable', responder);
        element.attachEvent('onlosecapture',   responder);
      }
    }
  
    function stopObserving(element, eventName, handler) {
      element = $(element);
      var handlerGiven = !Object.isUndefined(handler),
       eventNameGiven = !Object.isUndefined(eventName);
  
      if (!eventNameGiven && !handlerGiven) {
        stopObservingElement(element);
        return element;
      }
  
      if (!handlerGiven) {
        stopObservingEventName(element, eventName);
        return element;
      }
  
      var entry = unregister(element, eventName, handler);
  
      if (!entry) return element;
      removeEvent(element, eventName, entry.responder);
      return element;
    }
  
    function stopObservingStandardEvent(element, eventName, responder) {
      var actualEventName = getDOMEventName(eventName);
      if (element.removeEventListener) {
        element.removeEventListener(actualEventName, responder, false);
      } else {
        element.detachEvent('on' + actualEventName, responder);
      }
    }
  
    function stopObservingCustomEvent(element, eventName, responder) {
      if (element.removeEventListener) {
        element.removeEventListener('dataavailable', responder, false);
      } else {
        element.detachEvent('ondataavailable', responder);
        element.detachEvent('onlosecapture',   responder);
      }
    }
  
  
  
    function stopObservingElement(element) {
      var uid = getUniqueElementID(element), registry = GLOBAL.Event.cache[uid];
      if (!registry) return;
  
      destroyRegistryForElement(element, uid);
  
      var entries, i;
      for (var eventName in registry) {
        if (eventName === 'element') continue;
  
        entries = registry[eventName];
        i = entries.length;
        while (i--)
          removeEvent(element, eventName, entries[i].responder);
      }
    }
  
    function stopObservingEventName(element, eventName) {
      var registry = getRegistryForElement(element);
      var entries = registry[eventName];
      if (!entries) return;
      delete registry[eventName];
  
      var i = entries.length;
      while (i--)
        removeEvent(element, eventName, entries[i].responder);
    }
  
  
    function removeEvent(element, eventName, handler) {
      if (isCustomEvent(eventName))
        stopObservingCustomEvent(element, eventName, handler);
      else
        stopObservingStandardEvent(element, eventName, handler);
    }
  
  
  
    function getFireTarget(element) {
      if (element !== document) return element;
      if (document.createEvent && !element.dispatchEvent)
        return document.documentElement;
      return element;
    }
  
    function fire(element, eventName, memo, bubble) {
      element = getFireTarget($(element));
      if (Object.isUndefined(bubble)) bubble = true;
      memo = memo || {};
  
      var event = fireEvent(element, eventName, memo, bubble);
      return Event.extend(event);
    }
  
    function fireEvent_DOM(element, eventName, memo, bubble) {
      var event = document.createEvent('HTMLEvents');
      event.initEvent('dataavailable', bubble, true);
  
      event.eventName = eventName;
      event.memo = memo;
  
      element.dispatchEvent(event);
      return event;
    }
  
    function fireEvent_IE(element, eventName, memo, bubble) {
      var event = document.createEventObject();
      event.eventType = bubble ? 'ondataavailable' : 'onlosecapture';
  
      event.eventName = eventName;
      event.memo = memo;
  
      element.fireEvent(event.eventType, event);
      return event;
    }
  
    var fireEvent = document.createEvent ? fireEvent_DOM : fireEvent_IE;
  
  
  
    Event.Handler = Class.create({
      initialize: function(element, eventName, selector, callback) {
        this.element   = $(element);
        this.eventName = eventName;
        this.selector  = selector;
        this.callback  = callback;
        this.handler   = this.handleEvent.bind(this);
      },
  
  
      start: function() {
        Event.observe(this.element, this.eventName, this.handler);
        return this;
      },
  
      stop: function() {
        Event.stopObserving(this.element, this.eventName, this.handler);
        return this;
      },
  
      handleEvent: function(event) {
        var element = Event.findElement(event, this.selector);
        if (element) this.callback.call(this.element, event, element);
      }
    });
  
    function on(element, eventName, selector, callback) {
      element = $(element);
      if (Object.isFunction(selector) && Object.isUndefined(callback)) {
        callback = selector, selector = null;
      }
  
      return new Event.Handler(element, eventName, selector, callback).start();
    }
  
    Object.extend(Event, Event.Methods);
  
    Object.extend(Event, {
      fire:          fire,
      observe:       observe,
      stopObserving: stopObserving,
      on:            on
    });
  
    Element.addMethods({
      fire:          fire,
  
      observe:       observe,
  
      stopObserving: stopObserving,
  
      on:            on
    });
  
    Object.extend(document, {
      fire:          fire.methodize(),
  
      observe:       observe.methodize(),
  
      stopObserving: stopObserving.methodize(),
  
      on:            on.methodize(),
  
      loaded:        false
    });
  
    if (GLOBAL.Event) Object.extend(window.Event, Event);
    else GLOBAL.Event = Event;
  
    GLOBAL.Event.cache = {};
  
    function destroyCache_IE() {
      GLOBAL.Event.cache = null;
    }
  
    if (window.attachEvent)
      window.attachEvent('onunload', destroyCache_IE);
  
    DIV = null;
    docEl = null;
  })(this);
  
  (function(GLOBAL) {
    /* Code for creating leak-free event responders is based on work by
     John-David Dalton. */
  
    var docEl = document.documentElement;
    var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
      && 'onmouseleave' in docEl;
  
    function isSimulatedMouseEnterLeaveEvent(eventName) {
      return !MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
       (eventName === 'mouseenter' || eventName === 'mouseleave');
    }
  
    function createResponder(uid, eventName, handler) {
      if (Event._isCustomEvent(eventName))
        return createResponderForCustomEvent(uid, eventName, handler);
      if (isSimulatedMouseEnterLeaveEvent(eventName))
        return createMouseEnterLeaveResponder(uid, eventName, handler);
  
      return function(event) {
        if (!Event.cache) return;
  
        var element = Event.cache[uid].element;
        Event.extend(event, element);
        handler.call(element, event);
      };
    }
  
    function createResponderForCustomEvent(uid, eventName, handler) {
      return function(event) {
        var element = Event.cache[uid].element;
  
        if (Object.isUndefined(event.eventName))
          return false;
  
        if (event.eventName !== eventName)
          return false;
  
        Event.extend(event, element);
        handler.call(element, event);
      };
    }
  
    function createMouseEnterLeaveResponder(uid, eventName, handler) {
      return function(event) {
        var element = Event.cache[uid].element;
  
        Event.extend(event, element);
        var parent = event.relatedTarget;
  
        while (parent && parent !== element) {
          try { parent = parent.parentNode; }
          catch(e) { parent = element; }
        }
  
        if (parent === element) return;
        handler.call(element, event);
      }
    }
  
    GLOBAL.Event._createResponder = createResponder;
    docEl = null;
  })(this);
  
  (function(GLOBAL) {
    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
       Matthias Miller, Dean Edwards, John Resig, and Diego Perini. */
  
    var TIMER;
  
    function fireContentLoadedEvent() {
      if (document.loaded) return;
      if (TIMER) window.clearTimeout(TIMER);
      document.loaded = true;
      document.fire('dom:loaded');
    }
  
    function checkReadyState() {
      if (document.readyState === 'complete') {
        document.detachEvent('onreadystatechange', checkReadyState);
        fireContentLoadedEvent();
      }
    }
  
    function pollDoScroll() {
      try {
        document.documentElement.doScroll('left');
      } catch (e) {
        TIMER = pollDoScroll.defer();
        return;
      }
  
      fireContentLoadedEvent();
    }
  
  
    if (document.readyState === 'complete') {
      fireContentLoadedEvent();
      return;
    }
  
    if (document.addEventListener) {
      document.addEventListener('DOMContentLoaded', fireContentLoadedEvent, false);
    } else {
      document.attachEvent('onreadystatechange', checkReadyState);
      if (window == top) TIMER = pollDoScroll.defer();
    }
  
    Event.observe(window, 'load', fireContentLoadedEvent);
  })(this);
  
  
  Element.addMethods();
  /*------------------------------- 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');
  
  var Position = {
    includeScrollOffsets: false,
  
    prepare: function() {
      this.deltaX =  window.pageXOffset
                  || document.documentElement.scrollLeft
                  || document.body.scrollLeft
                  || 0;
      this.deltaY =  window.pageYOffset
                  || document.documentElement.scrollTop
                  || document.body.scrollTop
                  || 0;
    },
  
    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);
    },
  
    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;
    },
  
  
    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, context) {
      this.element.className.split(/\s+/).select(function(name) {
        return name.length > 0;
      })._each(iterator, context);
    },
  
    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);
  
  /*--------------------------------------------------------------------------*/
  
  (function() {
    window.Selector = Class.create({
      initialize: function(expression) {
        this.expression = expression.strip();
      },
  
      findElements: function(rootElement) {
        return Prototype.Selector.select(this.expression, rootElement);
      },
  
      match: function(element) {
        return Prototype.Selector.match(element, this.expression);
      },
  
      toString: function() {
        return this.expression;
      },
  
      inspect: function() {
        return "#<Selector: " + this.expression + ">";
      }
    });
  
    Object.extend(Selector, {
      matchElements: function(elements, expression) {
        var match = Prototype.Selector.match,
            results = [];
  
        for (var i = 0, length = elements.length; i < length; i++) {
          var element = elements[i];
          if (match(element, expression)) {
            results.push(Element.extend(element));
          }
        }
        return results;
      },
  
      findElement: function(elements, expression, index) {
        index = index || 0;
        var matchIndex = 0, element;
        for (var i = 0, length = elements.length; i < length; i++) {
          element = elements[i];
          if (Prototype.Selector.match(element, expression) && index === matchIndex++) {
            return Element.extend(element);
          }
        }
      },
  
      findChildElements: function(element, expressions) {
        var selector = expressions.toArray().join(', ');
        return Prototype.Selector.select(selector, element || document);
      }
    });
  })();
  