text: /**
   * The YUI module contains the components required for building the YUI seed
   * file.  This includes the script loading mechanism, a simple queue, and
   * the core utilities for the library.
   * @module yui
   * @submodule yui-base
   */
  
  if (typeof YUI != 'undefined') {
      YUI._YUI = YUI;
  }
  
  /**
  The YUI global namespace object.  If YUI is already defined, the
  existing YUI object will not be overwritten so that defined
  namespaces are preserved.  It is the constructor for the object
  the end user interacts with.  As indicated below, each instance
  has full custom event support, but only if the event system
  is available.  This is a self-instantiable factory function.  You
  can invoke it directly like this:
  
       YUI().use('*', function(Y) {
           // ready
       });
  
  But it also works like this:
  
       var Y = YUI();
  
  @class YUI
  @constructor
  @global
  @uses EventTarget
  @param o* {Object} 0..n optional configuration objects.  these values
  are store in Y.config.  See <a href="config.html">Config</a> for the list of supported
  properties.
  */
      /*global YUI*/
      /*global YUI_config*/
      var YUI = function() {
          var i = 0,
              Y = this,
              args = arguments,
              l = args.length,
              instanceOf = function(o, type) {
                  return (o && o.hasOwnProperty && (o instanceof type));
              },
              gconf = (typeof YUI_config !== 'undefined') && YUI_config;
  
          if (!(instanceOf(Y, YUI))) {
              Y = new YUI();
          } else {
              // set up the core environment
              Y._init();
  
              /**
                  YUI.GlobalConfig is a master configuration that might span
                  multiple contexts in a non-browser environment.  It is applied
                  first to all instances in all contexts.
                  @property GlobalConfig
                  @type {Object}
                  @global
                  @static
                  @example
  
                      
                      YUI.GlobalConfig = {
                          filter: 'debug'
                      };
  
                      YUI().use('node', function(Y) {
                          //debug files used here
                      });
  
                      YUI({
                          filter: 'min'
                      }).use('node', function(Y) {
                          //min files used here
                      });
  
              */
              if (YUI.GlobalConfig) {
                  Y.applyConfig(YUI.GlobalConfig);
              }
              
              /**
                  YUI_config is a page-level config.  It is applied to all
                  instances created on the page.  This is applied after
                  YUI.GlobalConfig, and before the instance level configuration
                  objects.
                  @global
                  @property YUI_config
                  @type {Object}
                  @example
  
                      
                      //Single global var to include before YUI seed file
                      YUI_config = {
                          filter: 'debug'
                      };
                      
                      YUI().use('node', function(Y) {
                          //debug files used here
                      });
  
                      YUI({
                          filter: 'min'
                      }).use('node', function(Y) {
                          //min files used here
                      });
              */
              if (gconf) {
                  Y.applyConfig(gconf);
              }
  
              // bind the specified additional modules for this instance
              if (!l) {
                  Y._setup();
              }
          }
  
          if (l) {
              // Each instance can accept one or more configuration objects.
              // These are applied after YUI.GlobalConfig and YUI_Config,
              // overriding values set in those config files if there is a '
              // matching property.
              for (; i < l; i++) {
                  Y.applyConfig(args[i]);
              }
  
              Y._setup();
          }
  
          Y.instanceOf = instanceOf;
  
          return Y;
      };
  
  (function() {
  
      var proto, prop,
          VERSION = '@VERSION@',
          PERIOD = '.',
          BASE = 'http://yui.yahooapis.com/',
          DOC_LABEL = 'yui3-js-enabled',
          NOOP = function() {},
          SLICE = Array.prototype.slice,
          APPLY_TO_AUTH = { 'io.xdrReady': 1,   // the functions applyTo
                            'io.xdrResponse': 1,   // can call. this should
                            'SWF.eventHandler': 1 }, // be done at build time
          hasWin = (typeof window != 'undefined'),
          win = (hasWin) ? window : null,
          doc = (hasWin) ? win.document : null,
          docEl = doc && doc.documentElement,
          docClass = docEl && docEl.className,
          instances = {},
          time = new Date().getTime(),
          add = function(el, type, fn, capture) {
              if (el && el.addEventListener) {
                  el.addEventListener(type, fn, capture);
              } else if (el && el.attachEvent) {
                  el.attachEvent('on' + type, fn);
              }
          },
          remove = function(el, type, fn, capture) {
              if (el && el.removeEventListener) {
                  // this can throw an uncaught exception in FF
                  try {
                      el.removeEventListener(type, fn, capture);
                  } catch (ex) {}
              } else if (el && el.detachEvent) {
                  el.detachEvent('on' + type, fn);
              }
          },
          handleLoad = function() {
              YUI.Env.windowLoaded = true;
              YUI.Env.DOMReady = true;
              if (hasWin) {
                  remove(window, 'load', handleLoad);
              }
          },
          getLoader = function(Y, o) {
              var loader = Y.Env._loader;
              if (loader) {
                  //loader._config(Y.config);
                  loader.ignoreRegistered = false;
                  loader.onEnd = null;
                  loader.data = null;
                  loader.required = [];
                  loader.loadType = null;
              } else {
                  loader = new Y.Loader(Y.config);
                  Y.Env._loader = loader;
              }
              YUI.Env.core = Y.Array.dedupe([].concat(YUI.Env.core, [ 'loader-base', 'loader-rollup', 'loader-yui3' ]));
  
              return loader;
          },
  
          clobber = function(r, s) {
              for (var i in s) {
                  if (s.hasOwnProperty(i)) {
                      r[i] = s[i];
                  }
              }
          },
  
          ALREADY_DONE = { success: true };
  
  //  Stamp the documentElement (HTML) with a class of "yui-loaded" to
  //  enable styles that need to key off of JS being enabled.
  if (docEl && docClass.indexOf(DOC_LABEL) == -1) {
      if (docClass) {
          docClass += ' ';
      }
      docClass += DOC_LABEL;
      docEl.className = docClass;
  }
  
  if (VERSION.indexOf('@') > -1) {
      VERSION = '3.3.0'; // dev time hack for cdn test
  }
  
  proto = {
      /**
       * Applies a new configuration object to the YUI instance config.
       * This will merge new group/module definitions, and will also
       * update the loader cache if necessary.  Updating Y.config directly
       * will not update the cache.
       * @method applyConfig
       * @param {Object} o the configuration object.
       * @since 3.2.0
       */
      applyConfig: function(o) {
  
          o = o || NOOP;
  
          var attr,
              name,
              // detail,
              config = this.config,
              mods = config.modules,
              groups = config.groups,
              rls = config.rls,
              loader = this.Env._loader;
  
          for (name in o) {
              if (o.hasOwnProperty(name)) {
                  attr = o[name];
                  if (mods && name == 'modules') {
                      clobber(mods, attr);
                  } else if (groups && name == 'groups') {
                      clobber(groups, attr);
                  } else if (rls && name == 'rls') {
                      clobber(rls, attr);
                  } else if (name == 'win') {
                      config[name] = attr.contentWindow || attr;
                      config.doc = config[name].document;
                  } else if (name == '_yuid') {
                      // preserve the guid
                  } else {
                      config[name] = attr;
                  }
              }
          }
  
          if (loader) {
              loader._config(o);
          }
      },
      /**
      * Old way to apply a config to the instance (calls `applyConfig` under the hood)
      * @private
      * @method _config
      * @param {Object} o The config to apply
      */
      _config: function(o) {
          this.applyConfig(o);
      },
  
      /**
       * Initialize this YUI instance
       * @private
       * @method _init
       */
      _init: function() {
          var filter,
              Y = this,
              G_ENV = YUI.Env,
              Env = Y.Env,
              prop;
  
          /**
           * The version number of the YUI instance.
           * @property version
           * @type string
           */
          Y.version = VERSION;
  
          if (!Env) {
              Y.Env = {
                  core: ['get','intl-base'],
                  mods: {}, // flat module map
                  versions: {}, // version module map
                  base: BASE,
                  cdn: BASE + VERSION + '/build/',
                  // bootstrapped: false,
                  _idx: 0,
                  _used: {},
                  _attached: {},
                  _missed: [],
                  _yidx: 0,
                  _uidx: 0,
                  _guidp: 'y',
                  _loaded: {},
                  // serviced: {},
                  // Regex in English:
                  // I'll start at the \b(simpleyui).
                  // 1. Look in the test string for "simpleyui" or "yui" or
                  //    "yui-base" or "yui-rls" or "yui-foobar" that comes after a word break.  That is, it
                  //    can't match "foyui" or "i_heart_simpleyui". This can be anywhere in the string.
                  // 2. After #1 must come a forward slash followed by the string matched in #1, so
                  //    "yui-base/yui-base" or "simpleyui/simpleyui" or "yui-pants/yui-pants".
                  // 3. The second occurence of the #1 token can optionally be followed by "-debug" or "-min",
                  //    so "yui/yui-min", "yui/yui-debug", "yui-base/yui-base-debug". NOT "yui/yui-tshirt".
                  // 4. This is followed by ".js", so "yui/yui.js", "simpleyui/simpleyui-min.js"
                  // 0. Going back to the beginning, now. If all that stuff in 1-4 comes after a "?" in the string,
                  //    then capture the junk between the LAST "&" and the string in 1-4.  So
                  //    "blah?foo/yui/yui.js" will capture "foo/" and "blah?some/thing.js&3.3.0/build/yui-rls/yui-rls.js"
                  //    will capture "3.3.0/build/"
                  //
                  // Regex Exploded:
                  // (?:\?             Find a ?
                  //   (?:[^&]*&)      followed by 0..n characters followed by an &
                  //   *               in fact, find as many sets of characters followed by a & as you can
                  //   ([^&]*)         capture the stuff after the last & in \1
                  // )?                but it's ok if all this ?junk&more_junk stuff isn't even there
                  // \b(simpleyui|     after a word break find either the string "simpleyui" or
                  //    yui(?:-\w+)?   the string "yui" optionally followed by a -, then more characters
                  // )                 and store the simpleyui or yui-* string in \2
                  // \/\2              then comes a / followed by the simpleyui or yui-* string in \2
                  // (?:-(min|debug))? optionally followed by "-min" or "-debug"
                  // .js               and ending in ".js"
                  _BASE_RE: /(?:\?(?:[^&]*&)*([^&]*))?\b(simpleyui|yui(?:-\w+)?)\/\2(?:-(min|debug))?\.js/,
                  parseBasePath: function(src, pattern) {
                      var match = src.match(pattern),
                          path, filter;
  
                      if (match) {
                          path = RegExp.leftContext || src.slice(0, src.indexOf(match[0]));
  
                          // this is to set up the path to the loader.  The file
                          // filter for loader should match the yui include.
                          filter = match[3];
  
                          // extract correct path for mixed combo urls
                          // http://yuilibrary.com/projects/yui3/ticket/2528423
                          if (match[1]) {
                              path += '?' + match[1];
                          }
                          path = {
                              filter: filter,
                              path: path
                          }
                      }
                      return path;
                  },
                  getBase: G_ENV && G_ENV.getBase ||
                          function(pattern) {
                              var nodes = (doc && doc.getElementsByTagName('script')) || [],
                                  path = Env.cdn, parsed,
                                  i, len, src;
  
                              for (i = 0, len = nodes.length; i < len; ++i) {
                                  src = nodes[i].src;
                                  if (src) {
                                      parsed = Y.Env.parseBasePath(src, pattern);
                                      if (parsed) {
                                          filter = parsed.filter;
                                          path = parsed.path;
                                          break;
                                      }
                                  }
                              }
  
                              // use CDN default
                              return path;
                          }
  
              };
  
              Env = Y.Env;
  
              Env._loaded[VERSION] = {};
  
              if (G_ENV && Y !== YUI) {
                  Env._yidx = ++G_ENV._yidx;
                  Env._guidp = ('yui_' + VERSION + '_' +
                               Env._yidx + '_' + time).replace(/\./g, '_');
              } else if (YUI._YUI) {
  
                  G_ENV = YUI._YUI.Env;
                  Env._yidx += G_ENV._yidx;
                  Env._uidx += G_ENV._uidx;
  
                  for (prop in G_ENV) {
                      if (!(prop in Env)) {
                          Env[prop] = G_ENV[prop];
                      }
                  }
  
                  delete YUI._YUI;
              }
  
              Y.id = Y.stamp(Y);
              instances[Y.id] = Y;
  
          }
  
          Y.constructor = YUI;
  
          // configuration defaults
          Y.config = Y.config || {
              win: win,
              doc: doc,
              debug: true,
              useBrowserConsole: true,
              throwFail: true,
              bootstrap: true,
              cacheUse: true,
              fetchCSS: true,
              use_rls: false,
              rls_timeout: 2000
          };
  
          if (YUI.Env.rls_disabled) {
              Y.config.use_rls = false;
          }
  
          Y.config.lang = Y.config.lang || 'en-US';
  
          Y.config.base = YUI.config.base || Y.Env.getBase(Y.Env._BASE_RE);
          
          if (!filter || (!('mindebug').indexOf(filter))) {
              filter = 'min';
          }
          filter = (filter) ? '-' + filter : filter;
          Y.config.loaderPath = YUI.config.loaderPath || 'loader/loader' + filter + '.js';
  
      },
  
      /**
       * Finishes the instance setup. Attaches whatever modules were defined
       * when the yui modules was registered.
       * @method _setup
       * @private
       */
      _setup: function(o) {
          var i, Y = this,
              core = [],
              mods = YUI.Env.mods,
              //extras = Y.config.core || ['get','intl-base'];
              extras = Y.config.core || [].concat(YUI.Env.core); //Clone it..
  
          for (i = 0; i < extras.length; i++) {
              if (mods[extras[i]]) {
                  core.push(extras[i]);
              }
          }
  
          Y._attach(['yui-base']);
          Y._attach(core);
  
          if (Y.Loader) {
              getLoader(Y);
          }
  
          // Y.log(Y.id + ' initialized', 'info', 'yui');
      },
  
      /**
       * Executes a method on a YUI instance with
       * the specified id if the specified method is whitelisted.
       * @method applyTo
       * @param id {String} the YUI instance id.
       * @param method {String} the name of the method to exectute.
       * Ex: 'Object.keys'.
       * @param args {Array} the arguments to apply to the method.
       * @return {Object} the return value from the applied method or null.
       */
      applyTo: function(id, method, args) {
          if (!(method in APPLY_TO_AUTH)) {
              this.log(method + ': applyTo not allowed', 'warn', 'yui');
              return null;
          }
  
          var instance = instances[id], nest, m, i;
          if (instance) {
              nest = method.split('.');
              m = instance;
              for (i = 0; i < nest.length; i = i + 1) {
                  m = m[nest[i]];
                  if (!m) {
                      this.log('applyTo not found: ' + method, 'warn', 'yui');
                  }
              }
              return m.apply(instance, args);
          }
  
          return null;
      },
  
  /**
  Registers a module with the YUI global.  The easiest way to create a
  first-class YUI module is to use the YUI component build tool.
  
  http://yuilibrary.com/projects/builder
  
  The build system will produce the `YUI.add` wrapper for you module, along
  with any configuration info required for the module.
  @method add
  @param name {String} module name.
  @param fn {Function} entry point into the module that is used to bind module to the YUI instance.
  @param {YUI} fn.Y The YUI instance this module is executed in.
  @param {String} fn.name The name of the module
  @param version {String} version string.
  @param details {Object} optional config data:
  @param details.requires {Array} features that must be present before this module can be attached.
  @param details.optional {Array} optional features that should be present if loadOptional
   is defined.  Note: modules are not often loaded this way in YUI 3,
   but this field is still useful to inform the user that certain
   features in the component will require additional dependencies.
  @param details.use {Array} features that are included within this module which need to
   be attached automatically when this module is attached.  This
   supports the YUI 3 rollup system -- a module with submodules
   defined will need to have the submodules listed in the 'use'
   config.  The YUI component build tool does this for you.
  @return {YUI} the YUI instance.
  @example
  
      YUI.add('davglass', function(Y, name) {
          Y.davglass = function() {
              alert('Dav was here!');
          };
      }, '3.4.0', { requires: ['yui-base', 'harley-davidson', 'mt-dew'] });
  
  */
      add: function(name, fn, version, details) {
          details = details || {};
          var env = YUI.Env,
              mod = {
                  name: name,
                  fn: fn,
                  version: version,
                  details: details
              },
              loader,
              i, versions = env.versions;
  
          env.mods[name] = mod;
          versions[version] = versions[version] || {};
          versions[version][name] = mod;
  
          for (i in instances) {
              if (instances.hasOwnProperty(i)) {
                  loader = instances[i].Env._loader;
                  if (loader) {
                      if (!loader.moduleInfo[name]) {
                          loader.addModule(details, name);
                      }
                  }
              }
          }
  
          return this;
      },
  
      /**
       * Executes the function associated with each required
       * module, binding the module to the YUI instance.
       * @param {Array} r The array of modules to attach
       * @param {Boolean} [moot=false] Don't throw a warning if the module is not attached
       * @method _attach
       * @private
       */
      _attach: function(r, moot) {
          var i, name, mod, details, req, use, after,
              mods = YUI.Env.mods,
              aliases = YUI.Env.aliases,
              Y = this, j,
              loader = Y.Env._loader,
              done = Y.Env._attached,
              len = r.length, loader,
              c = [];
  
          //Check for conditional modules (in a second+ instance) and add their requirements
          //TODO I hate this entire method, it needs to be fixed ASAP (3.5.0) ^davglass
          for (i = 0; i < len; i++) {
              name = r[i];
              mod = mods[name];
              c.push(name);
              if (loader && loader.conditions[name]) {
                  Y.Object.each(loader.conditions[name], function(def) {
                      var go = def && ((def.ua && Y.UA[def.ua]) || (def.test && def.test(Y)));
                      if (go) {
                          c.push(def.name);
                      }
                  });
              }
          }
          r = c;
          len = r.length;
  
          for (i = 0; i < len; i++) {
              if (!done[r[i]]) {
                  name = r[i];
                  mod = mods[name];
  
                  if (aliases && aliases[name]) {
                      Y._attach(aliases[name]);
                      continue;
                  }
                  if (!mod) {
                      if (loader && loader.moduleInfo[name]) {
                          mod = loader.moduleInfo[name];
                          moot = true;
                      }
  
                      // Y.log('no js def for: ' + name, 'info', 'yui');
  
                      //if (!loader || !loader.moduleInfo[name]) {
                      //if ((!loader || !loader.moduleInfo[name]) && !moot) {
                      if (!moot) {
                          if ((name.indexOf('skin-') === -1) && (name.indexOf('css') === -1)) {
                              Y.Env._missed.push(name);
                              Y.Env._missed = Y.Array.dedupe(Y.Env._missed);
                              Y.message('NOT loaded: ' + name, 'warn', 'yui');
                          }
                      }
                  } else {
                      done[name] = true;
                      //Don't like this, but in case a mod was asked for once, then we fetch it
                      //We need to remove it from the missed list ^davglass
                      for (j = 0; j < Y.Env._missed.length; j++) {
                          if (Y.Env._missed[j] === name) {
                              Y.message('Found: ' + name + ' (was reported as missing earlier)', 'warn', 'yui');
                              Y.Env._missed.splice(j, 1);
                          }
                      }
                      details = mod.details;
                      req = details.requires;
                      use = details.use;
                      after = details.after;
  
                      if (req) {
                          for (j = 0; j < req.length; j++) {
                              if (!done[req[j]]) {
                                  if (!Y._attach(req)) {
                                      return false;
                                  }
                                  break;
                              }
                          }
                      }
  
                      if (after) {
                          for (j = 0; j < after.length; j++) {
                              if (!done[after[j]]) {
                                  if (!Y._attach(after, true)) {
                                      return false;
                                  }
                                  break;
                              }
                          }
                      }
  
                      if (mod.fn) {
                          try {
                              mod.fn(Y, name);
                          } catch (e) {
                              Y.error('Attach error: ' + name, e, name);
                              return false;
                          }
                      }
  
                      if (use) {
                          for (j = 0; j < use.length; j++) {
                              if (!done[use[j]]) {
                                  if (!Y._attach(use)) {
                                      return false;
                                  }
                                  break;
                              }
                          }
                      }
  
  
  
                  }
              }
          }
  
          return true;
      },
  
      /**
       * Attaches one or more modules to the YUI instance.  When this
       * is executed, the requirements are analyzed, and one of
       * several things can happen:
       *
       *  * All requirements are available on the page --  The modules
       *   are attached to the instance.  If supplied, the use callback
       *   is executed synchronously.
       *
       *  * Modules are missing, the Get utility is not available OR
       *   the 'bootstrap' config is false -- A warning is issued about
       *   the missing modules and all available modules are attached.
       *
       *  * Modules are missing, the Loader is not available but the Get
       *   utility is and boostrap is not false -- The loader is bootstrapped
       *   before doing the following....
       *
       *  * Modules are missing and the Loader is available -- The loader
       *   expands the dependency tree and fetches missing modules.  When
       *   the loader is finshed the callback supplied to use is executed
       *   asynchronously.
       *
       * @method use
       * @param modules* {String} 1-n modules to bind (uses arguments array).
       * @param *callback {Function} callback function executed when
       * the instance has the required functionality.  If included, it
       * must be the last parameter.
       *
       * @example
       *      // loads and attaches dd and its dependencies
       *      YUI().use('dd', function(Y) {});
       *
       *      // loads and attaches dd and node as well as all of their dependencies (since 3.4.0)
       *      YUI().use(['dd', 'node'], function(Y) {});
       *
       *      // attaches all modules that are available on the page
       *      YUI().use('*', function(Y) {});
       *
       *      // intrinsic YUI gallery support (since 3.1.0)
       *      YUI().use('gallery-yql', function(Y) {});
       *
       *      // intrinsic YUI 2in3 support (since 3.1.0)
       *      YUI().use('yui2-datatable', function(Y) {});
       *
       * @return {YUI} the YUI instance.
       */
      use: function() {
          var args = SLICE.call(arguments, 0),
              callback = args[args.length - 1],
              Y = this,
              i = 0,
              name,
              Env = Y.Env,
              provisioned = true;
  
          // The last argument supplied to use can be a load complete callback
          if (Y.Lang.isFunction(callback)) {
              args.pop();
          } else {
              callback = null;
          }
          if (Y.Lang.isArray(args[0])) {
              args = args[0];
          }
  
          if (Y.config.cacheUse) {
              while ((name = args[i++])) {
                  if (!Env._attached[name]) {
                      provisioned = false;
                      break;
                  }
              }
  
              if (provisioned) {
                  if (args.length) {
                      Y.log('already provisioned: ' + args, 'info', 'yui');
                  }
                  Y._notify(callback, ALREADY_DONE, args);
                  return Y;
              }
          }
  
          if (Y._loading) {
              Y._useQueue = Y._useQueue || new Y.Queue();
              Y._useQueue.add([args, callback]);
          } else {
              Y._use(args, function(Y, response) {
                  Y._notify(callback, response, args);
              });
          }
  
          return Y;
      },
      /**
      * Notify handler from Loader for attachment/load errors
      * @method _notify
      * @param callback {Function} The callback to pass to the `Y.config.loadErrorFn`
      * @param response {Object} The response returned from Loader
      * @param args {Array} The aruments passed from Loader
      * @private
      */
      _notify: function(callback, response, args) {
          if (!response.success && this.config.loadErrorFn) {
              this.config.loadErrorFn.call(this, this, callback, response, args);
          } else if (callback) {
              try {
                  callback(this, response);
              } catch (e) {
                  this.error('use callback error', e, args);
              }
          }
      },
      
      /**
      * This private method is called from the `use` method queue. To ensure that only one set of loading
      * logic is performed at a time.
      * @method _use
      * @private
      * @param args* {String} 1-n modules to bind (uses arguments array).
      * @param *callback {Function} callback function executed when
      * the instance has the required functionality.  If included, it
      * must be the last parameter.
      */
      _use: function(args, callback) {
  
          if (!this.Array) {
              this._attach(['yui-base']);
          }
  
          var len, loader, handleBoot, handleRLS,
              Y = this,
              G_ENV = YUI.Env,
              mods = G_ENV.mods,
              Env = Y.Env,
              used = Env._used,
              queue = G_ENV._loaderQueue,
              firstArg = args[0],
              YArray = Y.Array,
              config = Y.config,
              boot = config.bootstrap,
              missing = [],
              r = [],
              ret = true,
              fetchCSS = config.fetchCSS,
              process = function(names, skip) {
  
                  if (!names.length) {
                      return;
                  }
  
                  YArray.each(names, function(name) {
  
                      // add this module to full list of things to attach
                      if (!skip) {
                          r.push(name);
                      }
  
                      // only attach a module once
                      if (used[name]) {
                          return;
                      }
  
                      var m = mods[name], req, use;
  
                      if (m) {
                          used[name] = true;
                          req = m.details.requires;
                          use = m.details.use;
                      } else {
                          // CSS files don't register themselves, see if it has
                          // been loaded
                          if (!G_ENV._loaded[VERSION][name]) {
                              missing.push(name);
                          } else {
                              used[name] = true; // probably css
                          }
                      }
  
                      // make sure requirements are attached
                      if (req && req.length) {
                          process(req);
                      }
  
                      // make sure we grab the submodule dependencies too
                      if (use && use.length) {
                          process(use, 1);
                      }
                  });
              },
  
              handleLoader = function(fromLoader) {
                  var response = fromLoader || {
                          success: true,
                          msg: 'not dynamic'
                      },
                      redo, origMissing,
                      ret = true,
                      data = response.data;
  
  
                  Y._loading = false;
  
                  if (data) {
                      origMissing = missing;
                      missing = [];
                      r = [];
                      process(data);
                      redo = missing.length;
                      if (redo) {
                          if (missing.sort().join() ==
                                  origMissing.sort().join()) {
                              redo = false;
                          }
                      }
                  }
  
                  if (redo && data) {
                      Y._loading = false;
                      Y._use(args, function() {
                          Y.log('Nested use callback: ' + data, 'info', 'yui');
                          if (Y._attach(data)) {
                              Y._notify(callback, response, data);
                          }
                      });
                  } else {
                      if (data) {
                          // Y.log('attaching from loader: ' + data, 'info', 'yui');
                          ret = Y._attach(data);
                      }
                      if (ret) {
                          Y._notify(callback, response, args);
                      }
                  }
  
                  if (Y._useQueue && Y._useQueue.size() && !Y._loading) {
                      Y._use.apply(Y, Y._useQueue.next());
                  }
  
              };
  
  // Y.log(Y.id + ': use called: ' + a + ' :: ' + callback, 'info', 'yui');
  
          // YUI().use('*'); // bind everything available
          if (firstArg === '*') {
              ret = Y._attach(Y.Object.keys(mods));
              if (ret) {
                  handleLoader();
              }
              return Y;
          }
  
          // Y.log('before loader requirements: ' + args, 'info', 'yui');
  
          // use loader to expand dependencies and sort the
          // requirements if it is available.
          if (boot && Y.Loader && args.length) {
              loader = getLoader(Y);
              loader.require(args);
              loader.ignoreRegistered = true;
              loader.calculate(null, (fetchCSS) ? null : 'js');
              args = loader.sorted;
          }
  
          // process each requirement and any additional requirements
          // the module metadata specifies
          process(args);
  
          len = missing.length;
  
          if (len) {
              missing = Y.Object.keys(YArray.hash(missing));
              len = missing.length;
  Y.log('Modules missing: ' + missing + ', ' + missing.length, 'info', 'yui');
          }
  
  
          // dynamic load
          if (boot && len && Y.Loader) {
  // Y.log('Using loader to fetch missing deps: ' + missing, 'info', 'yui');
              Y.log('Using Loader', 'info', 'yui');
              Y._loading = true;
              loader = getLoader(Y);
              loader.onEnd = handleLoader;
              loader.context = Y;
              loader.data = args;
              loader.ignoreRegistered = false;
              loader.require(args);
              loader.insert(null, (fetchCSS) ? null : 'js');
              // loader.partial(missing, (fetchCSS) ? null : 'js');
  
          } else if (len && Y.config.use_rls && !YUI.Env.rls_enabled) {
  
              G_ENV._rls_queue = G_ENV._rls_queue || new Y.Queue();
  
              // server side loader service
              handleRLS = function(instance, argz) {
  
                  var rls_end = function(o) {
                      handleLoader(o);
                      instance.rls_advance();
                  },
                  rls_url = instance._rls(argz);
  
                  if (rls_url) {
                      Y.log('Fetching RLS url', 'info', 'rls');
                      instance.rls_oncomplete(function(o) {
                          rls_end(o);
                      });
                      instance.Get.script(rls_url, {
                          data: argz,
                          timeout: instance.config.rls_timeout,
                          onFailure: instance.rls_handleFailure,
                          onTimeout: instance.rls_handleTimeout
                      });
                  } else {
                      rls_end({
                          success: true,
                          data: argz
                      });
                  }
              };
  
              G_ENV._rls_queue.add(function() {
                  Y.log('executing queued rls request', 'info', 'rls');
                  G_ENV._rls_in_progress = true;
                  Y.rls_callback = callback;
                  Y.rls_locals(Y, args, handleRLS);
              });
  
              if (!G_ENV._rls_in_progress && G_ENV._rls_queue.size()) {
                  G_ENV._rls_queue.next()();
              }
  
          } else if (boot && len && Y.Get && !Env.bootstrapped) {
  
              Y._loading = true;
  
              handleBoot = function() {
                  Y._loading = false;
                  queue.running = false;
                  Env.bootstrapped = true;
                  G_ENV._bootstrapping = false;
                  if (Y._attach(['loader'])) {
                      Y._use(args, callback);
                  }
              };
  
              if (G_ENV._bootstrapping) {
  Y.log('Waiting for loader', 'info', 'yui');
                  queue.add(handleBoot);
              } else {
                  G_ENV._bootstrapping = true;
  Y.log('Fetching loader: ' + config.base + config.loaderPath, 'info', 'yui');
                  Y.Get.script(config.base + config.loaderPath, {
                      onEnd: handleBoot
                  });
              }
  
          } else {
              Y.log('Attaching available dependencies: ' + args, 'info', 'yui');
              ret = Y._attach(args);
              if (ret) {
                  handleLoader();
              }
          }
  
          return Y;
      },
  
  
      /**
      Adds a namespace object onto the YUI global if called statically.
  
          // creates YUI.your.namespace.here as nested objects
          YUI.namespace("your.namespace.here");
  
      If called as a method on a YUI <em>instance</em>, it creates the
      namespace on the instance.
  
           // creates Y.property.package
           Y.namespace("property.package");
      
      Dots in the input string cause `namespace` to create nested objects for
      each token. If any part of the requested namespace already exists, the
      current object will be left in place.  This allows multiple calls to
      `namespace` to preserve existing namespaced properties.
      
      If the first token in the namespace string is "YAHOO", the token is
      discarded.
  
      Be careful with namespace tokens. Reserved words may work in some browsers
      and not others. For instance, the following will fail in some browsers
      because the supported version of JavaScript reserves the word "long":
      
           Y.namespace("really.long.nested.namespace");
      
      @method namespace
      @param  {String} namespace* namespaces to create.
      @return {Object}  A reference to the last namespace object created.
      **/
      namespace: function() {
          var a = arguments, o = this, i = 0, j, d, arg;
          for (; i < a.length; i++) {
              // d = ('' + a[i]).split('.');
              arg = a[i];
              if (arg.indexOf(PERIOD)) {
                  d = arg.split(PERIOD);
                  for (j = (d[0] == 'YAHOO') ? 1 : 0; j < d.length; j++) {
                      o[d[j]] = o[d[j]] || {};
                      o = o[d[j]];
                  }
              } else {
                  o[arg] = o[arg] || {};
              }
          }
          return o;
      },
  
      // this is replaced if the log module is included
      log: NOOP,
      message: NOOP,
      // this is replaced if the dump module is included
      dump: function (o) { return ''+o; },
  
      /**
       * Report an error.  The reporting mechanism is controled by
       * the `throwFail` configuration attribute.  If throwFail is
       * not specified, the message is written to the Logger, otherwise
       * a JS error is thrown
       * @method error
       * @param msg {String} the error message.
       * @param e {Error|String} Optional JS error that was caught, or an error string.
       * @param data Optional additional info
       * and `throwFail` is specified, this error will be re-thrown.
       * @return {YUI} this YUI instance.
       */
      error: function(msg, e, data) {
  
          var Y = this, ret;
  
          if (Y.config.errorFn) {
              ret = Y.config.errorFn.apply(Y, arguments);
          }
  
          if (Y.config.throwFail && !ret) {
              throw (e || new Error(msg));
          } else {
              Y.message(msg, 'error'); // don't scrub this one
          }
  
          return Y;
      },
  
      /**
       * Generate an id that is unique among all YUI instances
       * @method guid
       * @param pre {String} optional guid prefix.
       * @return {String} the guid.
       */
      guid: function(pre) {
          var id = this.Env._guidp + '_' + (++this.Env._uidx);
          return (pre) ? (pre + id) : id;
      },
  
      /**
       * Returns a `guid` associated with an object.  If the object
       * does not have one, a new one is created unless `readOnly`
       * is specified.
       * @method stamp
       * @param o {Object} The object to stamp.
       * @param readOnly {Boolean} if `true`, a valid guid will only
       * be returned if the object has one assigned to it.
       * @return {String} The object's guid or null.
       */
      stamp: function(o, readOnly) {
          var uid;
          if (!o) {
              return o;
          }
  
          // IE generates its own unique ID for dom nodes
          // The uniqueID property of a document node returns a new ID
          if (o.uniqueID && o.nodeType && o.nodeType !== 9) {
              uid = o.uniqueID;
          } else {
              uid = (typeof o === 'string') ? o : o._yuid;
          }
  
          if (!uid) {
              uid = this.guid();
              if (!readOnly) {
                  try {
                      o._yuid = uid;
                  } catch (e) {
                      uid = null;
                  }
              }
          }
          return uid;
      },
  
      /**
       * Destroys the YUI instance
       * @method destroy
       * @since 3.3.0
       */
      destroy: function() {
          var Y = this;
          if (Y.Event) {
              Y.Event._unload();
          }
          delete instances[Y.id];
          delete Y.Env;
          delete Y.config;
      }
  
      /**
       * instanceof check for objects that works around
       * memory leak in IE when the item tested is
       * window/document
       * @method instanceOf
       * @since 3.3.0
       */
  };
  
  
  
      YUI.prototype = proto;
  
      // inheritance utilities are not available yet
      for (prop in proto) {
          if (proto.hasOwnProperty(prop)) {
              YUI[prop] = proto[prop];
          }
      }
  
      // set up the environment
      YUI._init();
  
      if (hasWin) {
          // add a window load event at load time so we can capture
          // the case where it fires before dynamic loading is
          // complete.
          add(window, 'load', handleLoad);
      } else {
          handleLoad();
      }
  
      YUI.Env.add = add;
      YUI.Env.remove = remove;
  
      /*global exports*/
      // Support the CommonJS method for exporting our single global
      if (typeof exports == 'object') {
          exports.YUI = YUI;
      }
  
  }());
  
  
  /**
   * The config object contains all of the configuration options for
   * the `YUI` instance.  This object is supplied by the implementer
   * when instantiating a `YUI` instance.  Some properties have default
   * values if they are not supplied by the implementer.  This should
   * not be updated directly because some values are cached.  Use
   * `applyConfig()` to update the config object on a YUI instance that
   * has already been configured.
   *
   * @class config
   * @static
   */
  
  /**
   * Allows the YUI seed file to fetch the loader component and library
   * metadata to dynamically load additional dependencies.
   *
   * @property bootstrap
   * @type boolean
   * @default true
   */
  
  /**
   * Log to the browser console if debug is on and the browser has a
   * supported console.
   *
   * @property useBrowserConsole
   * @type boolean
   * @default true
   */
  
  /**
   * A hash of log sources that should be logged.  If specified, only
   * log messages from these sources will be logged.
   *
   * @property logInclude
   * @type object
   */
  
  /**
   * A hash of log sources that should be not be logged.  If specified,
   * all sources are logged if not on this list.
   *
   * @property logExclude
   * @type object
   */
  
  /**
   * Set to true if the yui seed file was dynamically loaded in
   * order to bootstrap components relying on the window load event
   * and the `domready` custom event.
   *
   * @property injected
   * @type boolean
   * @default false
   */
  
  /**
   * If `throwFail` is set, `Y.error` will generate or re-throw a JS Error.
   * Otherwise the failure is logged.
   *
   * @property throwFail
   * @type boolean
   * @default true
   */
  
  /**
   * The window/frame that this instance should operate in.
   *
   * @property win
   * @type Window
   * @default the window hosting YUI
   */
  
  /**
   * The document associated with the 'win' configuration.
   *
   * @property doc
   * @type Document
   * @default the document hosting YUI
   */
  
  /**
   * A list of modules that defines the YUI core (overrides the default).
   *
   * @property core
   * @type string[]
   */
  
  /**
   * A list of languages in order of preference. This list is matched against
   * the list of available languages in modules that the YUI instance uses to
   * determine the best possible localization of language sensitive modules.
   * Languages are represented using BCP 47 language tags, such as "en-GB" for
   * English as used in the United Kingdom, or "zh-Hans-CN" for simplified
   * Chinese as used in China. The list can be provided as a comma-separated
   * list or as an array.
   *
   * @property lang
   * @type string|string[]
   */
  
  /**
   * The default date format
   * @property dateFormat
   * @type string
   * @deprecated use configuration in `DataType.Date.format()` instead.
   */
  
  /**
   * The default locale
   * @property locale
   * @type string
   * @deprecated use `config.lang` instead.
   */
  
  /**
   * The default interval when polling in milliseconds.
   * @property pollInterval
   * @type int
   * @default 20
   */
  
  /**
   * The number of dynamic nodes to insert by default before
   * automatically removing them.  This applies to script nodes
   * because removing the node will not make the evaluated script
   * unavailable.  Dynamic CSS is not auto purged, because removing
   * a linked style sheet will also remove the style definitions.
   * @property purgethreshold
   * @type int
   * @default 20
   */
  
  /**
   * The default interval when polling in milliseconds.
   * @property windowResizeDelay
   * @type int
   * @default 40
   */
  
  /**
   * Base directory for dynamic loading
   * @property base
   * @type string
   */
  
  /*
   * The secure base dir (not implemented)
   * For dynamic loading.
   * @property secureBase
   * @type string
   */
  
  /**
   * The YUI combo service base dir. Ex: `http://yui.yahooapis.com/combo?`
   * For dynamic loading.
   * @property comboBase
   * @type string
   */
  
  /**
   * The root path to prepend to module path for the combo service.
   * Ex: 3.0.0b1/build/
   * For dynamic loading.
   * @property root
   * @type string
   */
  
  /**
   * A filter to apply to result urls.  This filter will modify the default
   * path for all modules.  The default path for the YUI library is the
   * minified version of the files (e.g., event-min.js).  The filter property
   * can be a predefined filter or a custom filter.  The valid predefined
   * filters are:
   * <dl>
   *  <dt>DEBUG</dt>
   *  <dd>Selects the debug versions of the library (e.g., event-debug.js).
   *      This option will automatically include the Logger widget</dd>
   *  <dt>RAW</dt>
   *  <dd>Selects the non-minified version of the library (e.g., event.js).</dd>
   * </dl>
   * You can also define a custom filter, which must be an object literal
   * containing a search expression and a replace string:
   * 
   *      myFilter: {
   *          'searchExp': "-min\\.js",
   *          'replaceStr': "-debug.js"
   *      }
   *
   * For dynamic loading.
   *
   * @property filter
   * @type string|object
   */
  
  /**
   * The `skin` config let's you configure application level skin
   * customizations.  It contains the following attributes which
   * can be specified to override the defaults:
   *
   *      // The default skin, which is automatically applied if not
   *      // overriden by a component-specific skin definition.
   *      // Change this in to apply a different skin globally
   *      defaultSkin: 'sam',
   *
   *      // This is combined with the loader base property to get
   *      // the default root directory for a skin.
   *      base: 'assets/skins/',
   *
   *      // Any component-specific overrides can be specified here,
   *      // making it possible to load different skins for different
   *      // components.  It is possible to load more than one skin
   *      // for a given component as well.
   *      overrides: {
   *          slider: ['capsule', 'round']
   *      }
   *
   * For dynamic loading.
   *
   *  @property skin
   */
  
  /**
   * Hash of per-component filter specification.  If specified for a given
   * component, this overrides the filter config.
   *
   * For dynamic loading.
   *
   * @property filters
   */
  
  /**
   * Use the YUI combo service to reduce the number of http connections
   * required to load your dependencies.  Turning this off will
   * disable combo handling for YUI and all module groups configured
   * with a combo service.
   *
   * For dynamic loading.
   *
   * @property combine
   * @type boolean
   * @default true if 'base' is not supplied, false if it is.
   */
  
  /**
   * A list of modules that should never be dynamically loaded
   *
   * @property ignore
   * @type string[]
   */
  
  /**
   * A list of modules that should always be loaded when required, even if already
   * present on the page.
   *
   * @property force
   * @type string[]
   */
  
  /**
   * Node or id for a node that should be used as the insertion point for new
   * nodes.  For dynamic loading.
   *
   * @property insertBefore
   * @type string
   */
  
  /**
   * Object literal containing attributes to add to dynamically loaded script
   * nodes.
   * @property jsAttributes
   * @type string
   */
  
  /**
   * Object literal containing attributes to add to dynamically loaded link
   * nodes.
   * @property cssAttributes
   * @type string
   */
  
  /**
   * Number of milliseconds before a timeout occurs when dynamically
   * loading nodes. If not set, there is no timeout.
   * @property timeout
   * @type int
   */
  
  /**
   * Callback for the 'CSSComplete' event.  When dynamically loading YUI
   * components with CSS, this property fires when the CSS is finished
   * loading but script loading is still ongoing.  This provides an
   * opportunity to enhance the presentation of a loading page a little
   * bit before the entire loading process is done.
   *
   * @property onCSS
   * @type function
   */
  
  /**
   * A hash of module definitions to add to the list of YUI components.
   * These components can then be dynamically loaded side by side with
   * YUI via the `use()` method. This is a hash, the key is the module
   * name, and the value is an object literal specifying the metdata
   * for the module.  See `Loader.addModule` for the supported module
   * metadata fields.  Also see groups, which provides a way to
   * configure the base and combo spec for a set of modules.
   * 
   *      modules: {
   *          mymod1: {
   *              requires: ['node'],
   *              fullpath: 'http://myserver.mydomain.com/mymod1/mymod1.js'
   *          },
   *          mymod2: {
   *              requires: ['mymod1'],
   *              fullpath: 'http://myserver.mydomain.com/mymod2/mymod2.js'
   *          }
   *      }
   *
   * @property modules
   * @type object
   */
  
  /**
   * A hash of module group definitions.  It for each group you
   * can specify a list of modules and the base path and
   * combo spec to use when dynamically loading the modules.
   * 
   *      groups: {
   *          yui2: {
   *              // specify whether or not this group has a combo service
   *              combine: true,
   * 
   *              // the base path for non-combo paths
   *              base: 'http://yui.yahooapis.com/2.8.0r4/build/',
   * 
   *              // the path to the combo service
   *              comboBase: 'http://yui.yahooapis.com/combo?',
   * 
   *              // a fragment to prepend to the path attribute when
   *              // when building combo urls
   *              root: '2.8.0r4/build/',
   * 
   *              // the module definitions
   *              modules:  {
   *                  yui2_yde: {
   *                      path: "yahoo-dom-event/yahoo-dom-event.js"
   *                  },
   *                  yui2_anim: {
   *                      path: "animation/animation.js",
   *                      requires: ['yui2_yde']
   *                  }
   *              }
   *          }
   *      }
   * 
   * @property groups
   * @type object
   */
  
  /**
   * The loader 'path' attribute to the loader itself.  This is combined
   * with the 'base' attribute to dynamically load the loader component
   * when boostrapping with the get utility alone.
   *
   * @property loaderPath
   * @type string
   * @default loader/loader-min.js
   */
  
  /**
   * Specifies whether or not YUI().use(...) will attempt to load CSS
   * resources at all.  Any truthy value will cause CSS dependencies
   * to load when fetching script.  The special value 'force' will
   * cause CSS dependencies to be loaded even if no script is needed.
   *
   * @property fetchCSS
   * @type boolean|string
   * @default true
   */
  
  /**
   * The default gallery version to build gallery module urls
   * @property gallery
   * @type string
   * @since 3.1.0
   */
  
  /**
   * The default YUI 2 version to build yui2 module urls.  This is for
   * intrinsic YUI 2 support via the 2in3 project.  Also see the '2in3'
   * config for pulling different revisions of the wrapped YUI 2
   * modules.
   * @since 3.1.0
   * @property yui2
   * @type string
   * @default 2.8.1
   */
  
  /**
   * The 2in3 project is a deployment of the various versions of YUI 2
   * deployed as first-class YUI 3 modules.  Eventually, the wrapper
   * for the modules will change (but the underlying YUI 2 code will
   * be the same), and you can select a particular version of
   * the wrapper modules via this config.
   * @since 3.1.0
   * @property 2in3
   * @type string
   * @default 1
   */
  
  /**
   * Alternative console log function for use in environments without
   * a supported native console.  The function is executed in the
   * YUI instance context.
   * @since 3.1.0
   * @property logFn
   * @type Function
   */
  
  /**
   * A callback to execute when Y.error is called.  It receives the
   * error message and an javascript error object if Y.error was
   * executed because a javascript error was caught.  The function
   * is executed in the YUI instance context.
   *
   * @since 3.2.0
   * @property errorFn
   * @type Function
   */
  
  /**
   * A callback to execute when the loader fails to load one or
   * more resource.  This could be because of a script load
   * failure.  It can also fail if a javascript module fails
   * to register itself, but only when the 'requireRegistration'
   * is true.  If this function is defined, the use() callback will
   * only be called when the loader succeeds, otherwise it always
   * executes unless there was a javascript error when attaching
   * a module.
   *
   * @since 3.3.0
   * @property loadErrorFn
   * @type Function
   */
  
  /**
   * When set to true, the YUI loader will expect that all modules
   * it is responsible for loading will be first-class YUI modules
   * that register themselves with the YUI global.  If this is
   * set to true, loader will fail if the module registration fails
   * to happen after the script is loaded.
   *
   * @since 3.3.0
   * @property requireRegistration
   * @type boolean
   * @default false
   */
  
  /**
   * Cache serviced use() requests.
   * @since 3.3.0
   * @property cacheUse
   * @type boolean
   * @default true
   * @deprecated no longer used
   */
  
  /**
   * The parameter defaults for the remote loader service. **Requires the rls seed file.** The properties that are supported:
   * 
   *  * `m`: comma separated list of module requirements.  This
   *    must be the param name even for custom implemetations.
   *  * `v`: the version of YUI to load.  Defaults to the version
   *    of YUI that is being used.
   *  * `gv`: the version of the gallery to load (see the gallery config)
   *  * `env`: comma separated list of modules already on the page.
   *      this must be the param name even for custom implemetations.
   *  * `lang`: the languages supported on the page (see the lang config)
   *  * `'2in3v'`:  the version of the 2in3 wrapper to use (see the 2in3 config).
   *  * `'2v'`: the version of yui2 to use in the yui 2in3 wrappers
   *  * `filt`: a filter def to apply to the urls (see the filter config).
   *  * `filts`: a list of custom filters to apply per module
   *  * `tests`: this is a map of conditional module test function id keys
   * with the values of 1 if the test passes, 0 if not.  This must be
   * the name of the querystring param in custom templates.
   *
   * @since 3.2.0
   * @property rls
   * @type {Object}
   */
  
  /**
   * The base path to the remote loader service. **Requires the rls seed file.**
   *
   * @since 3.2.0
   * @property rls_base
   * @type {String}
   */
  
  /**
   * The template to use for building the querystring portion
   * of the remote loader service url.  The default is determined
   * by the rls config -- each property that has a value will be
   * represented. **Requires the rls seed file.**
   * 
   * @since 3.2.0
   * @property rls_tmpl
   * @type {String}
   * @example
   *      m={m}&v={v}&env={env}&lang={lang}&filt={filt}&tests={tests}
   *
   */
  
  /**
   * Configure the instance to use a remote loader service instead of
   * the client loader. **Requires the rls seed file.**
   *
   * @since 3.2.0
   * @property use_rls
   * @type {Boolean}
   */
  YUI.add('yui-base', function(Y) {
  
  /*
   * YUI stub
   * @module yui
   * @submodule yui-base
   */
  /**
   * The YUI module contains the components required for building the YUI
   * seed file.  This includes the script loading mechanism, a simple queue,
   * and the core utilities for the library.
   * @module yui
   * @submodule yui-base
   */
  
  /**
   * Provides core language utilites and extensions used throughout YUI.
   *
   * @class Lang
   * @static
   */
  
  var L = Y.Lang || (Y.Lang = {}),
  
  STRING_PROTO = String.prototype,
  TOSTRING     = Object.prototype.toString,
  
  TYPES = {
      'undefined'        : 'undefined',
      'number'           : 'number',
      'boolean'          : 'boolean',
      'string'           : 'string',
      '[object Function]': 'function',
      '[object RegExp]'  : 'regexp',
      '[object Array]'   : 'array',
      '[object Date]'    : 'date',
      '[object Error]'   : 'error'
  },
  
  SUBREGEX  = /\{\s*([^|}]+?)\s*(?:\|([^}]*))?\s*\}/g,
  TRIMREGEX = /^\s+|\s+$/g,
  
  // If either MooTools or Prototype is on the page, then there's a chance that we
  // can't trust "native" language features to actually be native. When this is
  // the case, we take the safe route and fall back to our own non-native
  // implementation.
  win           = Y.config.win,
  unsafeNatives = win && !!(win.MooTools || win.Prototype);
  
  /**
   * Determines whether or not the provided item is an array.
   *
   * Returns `false` for array-like collections such as the function `arguments`
   * collection or `HTMLElement` collections. Use `Y.Array.test()` if you want to
   * test for an array-like collection.
   *
   * @method isArray
   * @param o The object to test.
   * @return {boolean} true if o is an array.
   * @static
   */
  L.isArray = (!unsafeNatives && Array.isArray) || function (o) {
      return L.type(o) === 'array';
  };
  
  /**
   * Determines whether or not the provided item is a boolean.
   * @method isBoolean
   * @static
   * @param o The object to test.
   * @return {boolean} true if o is a boolean.
   */
  L.isBoolean = function(o) {
      return typeof o === 'boolean';
  };
  
  /**
   * <p>
   * Determines whether or not the provided item is a function.
   * Note: Internet Explorer thinks certain functions are objects:
   * </p>
   *
   * <pre>
   * var obj = document.createElement("object");
   * Y.Lang.isFunction(obj.getAttribute) // reports false in IE
   * &nbsp;
   * var input = document.createElement("input"); // append to body
   * Y.Lang.isFunction(input.focus) // reports false in IE
   * </pre>
   *
   * <p>
   * You will have to implement additional tests if these functions
   * matter to you.
   * </p>
   *
   * @method isFunction
   * @static
   * @param o The object to test.
   * @return {boolean} true if o is a function.
   */
  L.isFunction = function(o) {
      return L.type(o) === 'function';
  };
  
  /**
   * Determines whether or not the supplied item is a date instance.
   * @method isDate
   * @static
   * @param o The object to test.
   * @return {boolean} true if o is a date.
   */
  L.isDate = function(o) {
      return L.type(o) === 'date' && o.toString() !== 'Invalid Date' && !isNaN(o);
  };
  
  /**
   * Determines whether or not the provided item is null.
   * @method isNull
   * @static
   * @param o The object to test.
   * @return {boolean} true if o is null.
   */
  L.isNull = function(o) {
      return o === null;
  };
  
  /**
   * Determines whether or not the provided item is a legal number.
   * @method isNumber
   * @static
   * @param o The object to test.
   * @return {boolean} true if o is a number.
   */
  L.isNumber = function(o) {
      return typeof o === 'number' && isFinite(o);
  };
  
  /**
   * Determines whether or not the provided item is of type object
   * or function. Note that arrays are also objects, so
   * <code>Y.Lang.isObject([]) === true</code>.
   * @method isObject
   * @static
   * @param o The object to test.
   * @param failfn {boolean} fail if the input is a function.
   * @return {boolean} true if o is an object.
   * @see isPlainObject
   */
  L.isObject = function(o, failfn) {
      var t = typeof o;
      return (o && (t === 'object' ||
          (!failfn && (t === 'function' || L.isFunction(o))))) || false;
  };
  
  /**
   * Determines whether or not the provided item is a string.
   * @method isString
   * @static
   * @param o The object to test.
   * @return {boolean} true if o is a string.
   */
  L.isString = function(o) {
      return typeof o === 'string';
  };
  
  /**
   * Determines whether or not the provided item is undefined.
   * @method isUndefined
   * @static
   * @param o The object to test.
   * @return {boolean} true if o is undefined.
   */
  L.isUndefined = function(o) {
      return typeof o === 'undefined';
  };
  
  /**
   * Returns a string without any leading or trailing whitespace.  If
   * the input is not a string, the input will be returned untouched.
   * @method trim
   * @static
   * @param s {string} the string to trim.
   * @return {string} the trimmed string.
   */
  L.trim = STRING_PROTO.trim ? function(s) {
      return s && s.trim ? s.trim() : s;
  } : function (s) {
      try {
          return s.replace(TRIMREGEX, '');
      } catch (e) {
          return s;
      }
  };
  
  /**
   * Returns a string without any leading whitespace.
   * @method trimLeft
   * @static
   * @param s {string} the string to trim.
   * @return {string} the trimmed string.
   */
  L.trimLeft = STRING_PROTO.trimLeft ? function (s) {
      return s.trimLeft();
  } : function (s) {
      return s.replace(/^\s+/, '');
  };
  
  /**
   * Returns a string without any trailing whitespace.
   * @method trimRight
   * @static
   * @param s {string} the string to trim.
   * @return {string} the trimmed string.
   */
  L.trimRight = STRING_PROTO.trimRight ? function (s) {
      return s.trimRight();
  } : function (s) {
      return s.replace(/\s+$/, '');
  };
  
  /**
   * A convenience method for detecting a legitimate non-null value.
   * Returns false for null/undefined/NaN, true for other values,
   * including 0/false/''
   * @method isValue
   * @static
   * @param o The item to test.
   * @return {boolean} true if it is not null/undefined/NaN || false.
   */
  L.isValue = function(o) {
      var t = L.type(o);
  
      switch (t) {
          case 'number':
              return isFinite(o);
  
          case 'null': // fallthru
          case 'undefined':
              return false;
  
          default:
              return !!t;
      }
  };
  
  /**
   * <p>
   * Returns a string representing the type of the item passed in.
   * </p>
   *
   * <p>
   * Known issues:
   * </p>
   *
   * <ul>
   *   <li>
   *     <code>typeof HTMLElementCollection</code> returns function in Safari, but
   *     <code>Y.type()</code> reports object, which could be a good thing --
   *     but it actually caused the logic in <code>Y.Lang.isObject</code> to fail.
   *   </li>
   * </ul>
   *
   * @method type
   * @param o the item to test.
   * @return {string} the detected type.
   * @static
   */
  L.type = function(o) {
      return TYPES[typeof o] || TYPES[TOSTRING.call(o)] || (o ? 'object' : 'null');
  };
  
  /**
   * Lightweight version of <code>Y.substitute</code>. Uses the same template
   * structure as <code>Y.substitute</code>, but doesn't support recursion,
   * auto-object coersion, or formats.
   * @method sub
   * @param {string} s String to be modified.
   * @param {object} o Object containing replacement values.
   * @return {string} the substitute result.
   * @static
   * @since 3.2.0
   */
  L.sub = function(s, o) {
      return s.replace ? s.replace(SUBREGEX, function (match, key) {
          return L.isUndefined(o[key]) ? match : o[key];
      }) : s;
  };
  
  /**
   * Returns the current time in milliseconds.
   *
   * @method now
   * @return {Number} Current time in milliseconds.
   * @static
   * @since 3.3.0
   */
  L.now = Date.now || function () {
      return new Date().getTime();
  };
  /**
  @module yui
  @submodule yui-base
  */
  
  var Lang   = Y.Lang,
      Native = Array.prototype,
  
      hasOwn = Object.prototype.hasOwnProperty;
  
  /**
  Provides utility methods for working with arrays. Additional array helpers can
  be found in the `collection` and `array-extras` modules.
  
  `Y.Array(thing)` returns a native array created from _thing_. Depending on
  _thing_'s type, one of the following will happen:
  
    * Arrays are returned unmodified unless a non-zero _startIndex_ is
      specified.
    * Array-like collections (see `Array.test()`) are converted to arrays.
    * For everything else, a new array is created with _thing_ as the sole
      item.
  
  Note: elements that are also collections, such as `<form>` and `<select>`
  elements, are not automatically converted to arrays. To force a conversion,
  pass `true` as the value of the _force_ parameter.
  
  @class Array
  @constructor
  @param {Any} thing The thing to arrayify.
  @param {Number} [startIndex=0] If non-zero and _thing_ is an array or array-like
    collection, a subset of items starting at the specified index will be
    returned.
  @param {Boolean} [force=false] If `true`, _thing_ will be treated as an
    array-like collection no matter what.
  @return {Array} A native array created from _thing_, according to the rules
    described above.
  **/
  function YArray(thing, startIndex, force) {
      var len, result;
  
      startIndex || (startIndex = 0);
  
      if (force || YArray.test(thing)) {
          // IE throws when trying to slice HTMLElement collections.
          try {
              return Native.slice.call(thing, startIndex);
          } catch (ex) {
              result = [];
  
              for (len = thing.length; startIndex < len; ++startIndex) {
                  result.push(thing[startIndex]);
              }
  
              return result;
          }
      }
  
      return [thing];
  }
  
  Y.Array = YArray;
  
  /**
  Dedupes an array of strings, returning an array that's guaranteed to contain
  only one copy of a given string.
  
  This method differs from `Array.unique()` in that it's optimized for use only
  with strings, whereas `unique` may be used with other types (but is slower).
  Using `dedupe()` with non-string values may result in unexpected behavior.
  
  @method dedupe
  @param {String[]} array Array of strings to dedupe.
  @return {Array} Deduped copy of _array_.
  @static
  @since 3.4.0
  **/
  YArray.dedupe = function (array) {
      var hash    = {},
          results = [],
          i, item, len;
  
      for (i = 0, len = array.length; i < len; ++i) {
          item = array[i];
  
          if (!hasOwn.call(hash, item)) {
              hash[item] = 1;
              results.push(item);
          }
      }
  
      return results;
  };
  
  /**
  Executes the supplied function on each item in the array. This method wraps
  the native ES5 `Array.forEach()` method if available.
  
  @method each
  @param {Array} array Array to iterate.
  @param {Function} fn Function to execute on each item in the array. The function
    will receive the following arguments:
      @param {Any} fn.item Current array item.
      @param {Number} fn.index Current array index.
      @param {Array} fn.array Array being iterated.
  @param {Object} [thisObj] `this` object to use when calling _fn_.
  @return {YUI} The YUI instance.
  @static
  **/
  YArray.each = YArray.forEach = Native.forEach ? function (array, fn, thisObj) {
      Native.forEach.call(array || [], fn, thisObj || Y);
      return Y;
  } : function (array, fn, thisObj) {
      for (var i = 0, len = (array && array.length) || 0; i < len; ++i) {
          if (i in array) {
              fn.call(thisObj || Y, array[i], i, array);
          }
      }
  
      return Y;
  };
  
  /**
  Alias for `each()`.
  
  @method forEach
  @static
  **/
  
  /**
  Returns an object using the first array as keys and the second as values. If
  the second array is not provided, or if it doesn't contain the same number of
  values as the first array, then `true` will be used in place of the missing
  values.
  
  @example
  
      Y.Array.hash(['a', 'b', 'c'], ['foo', 'bar']);
      // => {a: 'foo', b: 'bar', c: true}
  
  @method hash
  @param {String[]} keys Array of strings to use as keys.
  @param {Array} [values] Array to use as values.
  @return {Object} Hash using the first array as keys and the second as values.
  @static
  **/
  YArray.hash = function (keys, values) {
      var hash = {},
          vlen = (values && values.length) || 0,
          i, len;
  
      for (i = 0, len = keys.length; i < len; ++i) {
          if (i in keys) {
              hash[keys[i]] = vlen > i && i in values ? values[i] : true;
          }
      }
  
      return hash;
  };
  
  /**
  Returns the index of the first item in the array that's equal (using a strict
  equality check) to the specified _value_, or `-1` if the value isn't found.
  
  This method wraps the native ES5 `Array.indexOf()` method if available.
  
  @method indexOf
  @param {Array} array Array to search.
  @param {Any} value Value to search for.
  @return {Number} Index of the item strictly equal to _value_, or `-1` if not
    found.
  @static
  **/
  YArray.indexOf = Native.indexOf ? function (array, value) {
      // TODO: support fromIndex
      return Native.indexOf.call(array, value);
  } : function (array, value) {
      for (var i = 0, len = array.length; i < len; ++i) {
          if (i in array && array[i] === value) {
              return i;
          }
      }
  
      return -1;
  };
  
  /**
  Numeric sort convenience function.
  
  The native `Array.prototype.sort()` function converts values to strings and
  sorts them in lexicographic order, which is unsuitable for sorting numeric
  values. Provide `Array.numericSort` as a custom sort function when you want
  to sort values in numeric order.
  
  @example
  
      [42, 23, 8, 16, 4, 15].sort(Y.Array.numericSort);
      // => [4, 8, 15, 16, 23, 42]
  
  @method numericSort
  @param {Number} a First value to compare.
  @param {Number} b Second value to compare.
  @return {Number} Difference between _a_ and _b_.
  @static
  **/
  YArray.numericSort = function (a, b) {
      return a - b;
  };
  
  /**
  Executes the supplied function on each item in the array. Returning a truthy
  value from the function will stop the processing of remaining items.
  
  @method some
  @param {Array} array Array to iterate over.
  @param {Function} fn Function to execute on each item. The function will receive
    the following arguments:
      @param {Any} fn.value Current array item.
      @param {Number} fn.index Current array index.
      @param {Array} fn.array Array being iterated over.
  @param {Object} [thisObj] `this` object to use when calling _fn_.
  @return {Boolean} `true` if the function returns a truthy value on any of the
    items in the array; `false` otherwise.
  @static
  **/
  YArray.some = Native.some ? function (array, fn, thisObj) {
      return Native.some.call(array, fn, thisObj);
  } : function (array, fn, thisObj) {
      for (var i = 0, len = array.length; i < len; ++i) {
          if (i in array && fn.call(thisObj, array[i], i, array)) {
              return true;
          }
      }
  
      return false;
  };
  
  /**
  Evaluates _obj_ to determine if it's an array, an array-like collection, or
  something else. This is useful when working with the function `arguments`
  collection and `HTMLElement` collections.
  
  Note: This implementation doesn't consider elements that are also
  collections, such as `<form>` and `<select>`, to be array-like.
  
  @method test
  @param {Object} obj Object to test.
  @return {Number} A number indicating the results of the test:
  
    * 0: Neither an array nor an array-like collection.
    * 1: Real array.
    * 2: Array-like collection.
  
  @static
  **/
  YArray.test = function (obj) {
      var result = 0;
  
      if (Lang.isArray(obj)) {
          result = 1;
      } else if (Lang.isObject(obj)) {
          try {
              // indexed, but no tagName (element) or alert (window),
              // or functions without apply/call (Safari
              // HTMLElementCollection bug).
              if ('length' in obj && !obj.tagName && !obj.alert && !obj.apply) {
                  result = 2;
              }
          } catch (ex) {}
      }
  
      return result;
  };
  /**
   * The YUI module contains the components required for building the YUI
   * seed file.  This includes the script loading mechanism, a simple queue,
   * and the core utilities for the library.
   * @module yui
   * @submodule yui-base
   */
  
  /**
   * A simple FIFO queue.  Items are added to the Queue with add(1..n items) and
   * removed using next().
   *
   * @class Queue
   * @constructor
   * @param {MIXED} item* 0..n items to seed the queue.
   */
  function Queue() {
      this._init();
      this.add.apply(this, arguments);
  }
  
  Queue.prototype = {
      /**
       * Initialize the queue
       *
       * @method _init
       * @protected
       */
      _init: function() {
          /**
           * The collection of enqueued items
           *
           * @property _q
           * @type Array
           * @protected
           */
          this._q = [];
      },
  
      /**
       * Get the next item in the queue. FIFO support
       *
       * @method next
       * @return {MIXED} the next item in the queue.
       */
      next: function() {
          return this._q.shift();
      },
  
      /**
       * Get the last in the queue. LIFO support.
       *
       * @method last
       * @return {MIXED} the last item in the queue.
       */
      last: function() {
          return this._q.pop();
      },
  
      /**
       * Add 0..n items to the end of the queue.
       *
       * @method add
       * @param {MIXED} item* 0..n items.
       * @return {object} this queue.
       */
      add: function() {
          this._q.push.apply(this._q, arguments);
  
          return this;
      },
  
      /**
       * Returns the current number of queued items.
       *
       * @method size
       * @return {Number} The size.
       */
      size: function() {
          return this._q.length;
      }
  };
  
  Y.Queue = Queue;
  
  YUI.Env._loaderQueue = YUI.Env._loaderQueue || new Queue();
  
  /**
  The YUI module contains the components required for building the YUI seed file.
  This includes the script loading mechanism, a simple queue, and the core
  utilities for the library.
  
  @module yui
  @submodule yui-base
  **/
  
  var CACHED_DELIMITER = '__',
  
      hasOwn   = Object.prototype.hasOwnProperty,
      isObject = Y.Lang.isObject;
  
  /**
  Returns a wrapper for a function which caches the return value of that function,
  keyed off of the combined string representation of the argument values provided
  when the wrapper is called.
  
  Calling this function again with the same arguments will return the cached value
  rather than executing the wrapped function.
  
  Note that since the cache is keyed off of the string representation of arguments
  passed to the wrapper function, arguments that aren't strings and don't provide
  a meaningful `toString()` method may result in unexpected caching behavior. For
  example, the objects `{}` and `{foo: 'bar'}` would both be converted to the
  string `[object Object]` when used as a cache key.
  
  @method cached
  @param {Function} source The function to memoize.
  @param {Object} [cache={}] Object in which to store cached values. You may seed
    this object with pre-existing cached values if desired.
  @param {any} [refetch] If supplied, this value is compared with the cached value
    using a `==` comparison. If the values are equal, the wrapped function is
    executed again even though a cached value exists.
  @return {Function} Wrapped function.
  @for YUI
  **/
  Y.cached = function (source, cache, refetch) {
      cache || (cache = {});
  
      return function (arg) {
          var key = arguments.length > 1 ?
                  Array.prototype.join.call(arguments, CACHED_DELIMITER) :
                  String(arg);
  
          if (!(key in cache) || (refetch && cache[key] == refetch)) {
              cache[key] = source.apply(source, arguments);
          }
  
          return cache[key];
      };
  };
  
  /**
  Returns a new object containing all of the properties of all the supplied
  objects. The properties from later objects will overwrite those in earlier
  objects.
  
  Passing in a single object will create a shallow copy of it. For a deep copy,
  use `clone()`.
  
  @method merge
  @param {Object} objects* One or more objects to merge.
  @return {Object} A new merged object.
  **/
  Y.merge = function () {
      var args   = arguments,
          i      = 0,
          len    = args.length,
          result = {};
  
      for (; i < len; ++i) {
          Y.mix(result, args[i], true);
      }
  
      return result;
  };
  
  /**
  Mixes _supplier_'s properties into _receiver_.
  
  Properties on _receiver_ or _receiver_'s prototype will not be overwritten or
  shadowed unless the _overwrite_ parameter is `true`, and will not be merged
  unless the _merge_ parameter is `true`.
  
  In the default mode (0), only properties the supplier owns are copied (prototype
  properties are not copied). The following copying modes are available:
  
    * `0`: _Default_. Object to object.
    * `1`: Prototype to prototype.
    * `2`: Prototype to prototype and object to object.
    * `3`: Prototype to object.
    * `4`: Object to prototype.
  
  @method mix
  @param {Function|Object} receiver The object or function to receive the mixed
    properties.
  @param {Function|Object} supplier The object or function supplying the
    properties to be mixed.
  @param {Boolean} [overwrite=false] If `true`, properties that already exist
    on the receiver will be overwritten with properties from the supplier.
  @param {String[]} [whitelist] An array of property names to copy. If
    specified, only the whitelisted properties will be copied, and all others
    will be ignored.
  @param {Number} [mode=0] Mix mode to use. See above for available modes.
  @param {Boolean} [merge=false] If `true`, objects and arrays that already
    exist on the receiver will have the corresponding object/array from the
    supplier merged into them, rather than being skipped or overwritten. When
    both _overwrite_ and _merge_ are `true`, _merge_ takes precedence.
  @return {Function|Object|YUI} The receiver, or the YUI instance if the
    specified receiver is falsy.
  **/
  Y.mix = function(receiver, supplier, overwrite, whitelist, mode, merge) {
      var alwaysOverwrite, exists, from, i, key, len, to;
  
      // If no supplier is given, we return the receiver. If no receiver is given,
      // we return Y. Returning Y doesn't make much sense to me, but it's
      // grandfathered in for backcompat reasons.
      if (!receiver || !supplier) {
          return receiver || Y;
      }
  
      if (mode) {
          // In mode 2 (prototype to prototype and object to object), we recurse
          // once to do the proto to proto mix. The object to object mix will be
          // handled later on.
          if (mode === 2) {
              Y.mix(receiver.prototype, supplier.prototype, overwrite,
                      whitelist, 0, merge);
          }
  
          // Depending on which mode is specified, we may be copying from or to
          // the prototypes of the supplier and receiver.
          from = mode === 1 || mode === 3 ? supplier.prototype : supplier;
          to   = mode === 1 || mode === 4 ? receiver.prototype : receiver;
  
          // If either the supplier or receiver doesn't actually have a
          // prototype property, then we could end up with an undefined `from`
          // or `to`. If that happens, we abort and return the receiver.
          if (!from || !to) {
              return receiver;
          }
      } else {
          from = supplier;
          to   = receiver;
      }
  
      // If `overwrite` is truthy and `merge` is falsy, then we can skip a
      // property existence check on each iteration and save some time.
      alwaysOverwrite = overwrite && !merge;
  
      if (whitelist) {
          for (i = 0, len = whitelist.length; i < len; ++i) {
              key = whitelist[i];
  
              // We call `Object.prototype.hasOwnProperty` instead of calling
              // `hasOwnProperty` on the object itself, since the object's
              // `hasOwnProperty` method may have been overridden or removed.
              // Also, some native objects don't implement a `hasOwnProperty`
              // method.
              if (!hasOwn.call(from, key)) {
                  continue;
              }
  
              // The `key in to` check here is (sadly) intentional for backwards
              // compatibility reasons. It prevents undesired shadowing of
              // prototype members on `to`.
              exists = alwaysOverwrite ? false : key in to;
  
              if (merge && exists && isObject(to[key], true)
                      && isObject(from[key], true)) {
                  // If we're in merge mode, and the key is present on both
                  // objects, and the value on both objects is either an object or
                  // an array (but not a function), then we recurse to merge the
                  // `from` value into the `to` value instead of overwriting it.
                  //
                  // Note: It's intentional that the whitelist isn't passed to the
                  // recursive call here. This is legacy behavior that lots of
                  // code still depends on.
                  Y.mix(to[key], from[key], overwrite, null, 0, merge);
              } else if (overwrite || !exists) {
                  // We're not in merge mode, so we'll only copy the `from` value
                  // to the `to` value if we're in overwrite mode or if the
                  // current key doesn't exist on the `to` object.
                  to[key] = from[key];
              }
          }
      } else {
          for (key in from) {
              // The code duplication here is for runtime performance reasons.
              // Combining whitelist and non-whitelist operations into a single
              // loop or breaking the shared logic out into a function both result
              // in worse performance, and Y.mix is critical enough that the byte
              // tradeoff is worth it.
              if (!hasOwn.call(from, key)) {
                  continue;
              }
  
              // The `key in to` check here is (sadly) intentional for backwards
              // compatibility reasons. It prevents undesired shadowing of
              // prototype members on `to`.
              exists = alwaysOverwrite ? false : key in to;
  
              if (merge && exists && isObject(to[key], true)
                      && isObject(from[key], true)) {
                  Y.mix(to[key], from[key], overwrite, null, 0, merge);
              } else if (overwrite || !exists) {
                  to[key] = from[key];
              }
          }
  
          // If this is an IE browser with the JScript enumeration bug, force
          // enumeration of the buggy properties by making a recursive call with
          // the buggy properties as the whitelist.
          if (Y.Object._hasEnumBug) {
              Y.mix(to, from, overwrite, Y.Object._forceEnum, mode, merge);
          }
      }
  
      return receiver;
  };
  /**
   * The YUI module contains the components required for building the YUI
   * seed file.  This includes the script loading mechanism, a simple queue,
   * and the core utilities for the library.
   * @module yui
   * @submodule yui-base
   */
  
  /**
   * Adds utilities to the YUI instance for working with objects.
   *
   * @class Object
   */
  
  var hasOwn = Object.prototype.hasOwnProperty,
  
  // If either MooTools or Prototype is on the page, then there's a chance that we
  // can't trust "native" language features to actually be native. When this is
  // the case, we take the safe route and fall back to our own non-native
  // implementations.
  win           = Y.config.win,
  unsafeNatives = win && !!(win.MooTools || win.Prototype),
  
  UNDEFINED, // <-- Note the comma. We're still declaring vars.
  
  /**
   * Returns a new object that uses _obj_ as its prototype. This method wraps the
   * native ES5 `Object.create()` method if available, but doesn't currently
   * pass through `Object.create()`'s second argument (properties) in order to
   * ensure compatibility with older browsers.
   *
   * @method ()
   * @param {Object} obj Prototype object.
   * @return {Object} New object using _obj_ as its prototype.
   * @static
   */
  O = Y.Object = (!unsafeNatives && Object.create) ? function (obj) {
      // We currently wrap the native Object.create instead of simply aliasing it
      // to ensure consistency with our fallback shim, which currently doesn't
      // support Object.create()'s second argument (properties). Once we have a
      // safe fallback for the properties arg, we can stop wrapping
      // Object.create().
      return Object.create(obj);
  } : (function () {
      // Reusable constructor function for the Object.create() shim.
      function F() {}
  
      // The actual shim.
      return function (obj) {
          F.prototype = obj;
          return new F();
      };
  }()),
  
  /**
   * Property names that IE doesn't enumerate in for..in loops, even when they
   * should be enumerable. When `_hasEnumBug` is `true`, it's necessary to
   * manually enumerate these properties.
   *
   * @property _forceEnum
   * @type String[]
   * @protected
   * @static
   */
  forceEnum = O._forceEnum = [
      'hasOwnProperty',
      'isPrototypeOf',
      'propertyIsEnumerable',
      'toString',
      'toLocaleString',
      'valueOf'
  ],
  
  /**
   * `true` if this browser has the JScript enumeration bug that prevents
   * enumeration of the properties named in the `_forceEnum` array, `false`
   * otherwise.
   *
   * See:
   *   - <https://developer.mozilla.org/en/ECMAScript_DontEnum_attribute#JScript_DontEnum_Bug>
   *   - <http://whattheheadsaid.com/2010/10/a-safer-object-keys-compatibility-implementation>
   *
   * @property _hasEnumBug
   * @type Boolean
   * @protected
   * @static
   */
  hasEnumBug = O._hasEnumBug = !{valueOf: 0}.propertyIsEnumerable('valueOf'),
  
  /**
   * `true` if this browser incorrectly considers the `prototype` property of
   * functions to be enumerable. Currently known to affect Opera 11.50.
   *
   * @property _hasProtoEnumBug
   * @type Boolean
   * @protected
   * @static
   */
  hasProtoEnumBug = O._hasProtoEnumBug = (function () {}).propertyIsEnumerable('prototype'),
  
  /**
   * Returns `true` if _key_ exists on _obj_, `false` if _key_ doesn't exist or
   * exists only on _obj_'s prototype. This is essentially a safer version of
   * `obj.hasOwnProperty()`.
   *
   * @method owns
   * @param {Object} obj Object to test.
   * @param {String} key Property name to look for.
   * @return {Boolean} `true` if _key_ exists on _obj_, `false` otherwise.
   * @static
   */
  owns = O.owns = function (obj, key) {
      return !!obj && hasOwn.call(obj, key);
  }; // <-- End of var declarations.
  
  /**
   * Alias for `owns()`.
   *
   * @method hasKey
   * @param {Object} obj Object to test.
   * @param {String} key Property name to look for.
   * @return {Boolean} `true` if _key_ exists on _obj_, `false` otherwise.
   * @static
   */
  O.hasKey = owns;
  
  /**
   * Returns an array containing the object's enumerable keys. Does not include
   * prototype keys or non-enumerable keys.
   *
   * Note that keys are returned in enumeration order (that is, in the same order
   * that they would be enumerated by a `for-in` loop), which may not be the same
   * as the order in which they were defined.
   *
   * This method is an alias for the native ES5 `Object.keys()` method if
   * available.
   *
   * @example
   *
   *     Y.Object.keys({a: 'foo', b: 'bar', c: 'baz'});
   *     // => ['a', 'b', 'c']
   *
   * @method keys
   * @param {Object} obj An object.
   * @return {String[]} Array of keys.
   * @static
   */
  O.keys = (!unsafeNatives && Object.keys) || function (obj) {
      if (!Y.Lang.isObject(obj)) {
          throw new TypeError('Object.keys called on a non-object');
      }
  
      var keys = [],
          i, key, len;
  
      if (hasProtoEnumBug && typeof obj === 'function') {
          for (key in obj) {
              if (owns(obj, key) && key !== 'prototype') {
                  keys.push(key);
              }
          }
      } else {
          for (key in obj) {
              if (owns(obj, key)) {
                  keys.push(key);
              }
          }
      }
  
      if (hasEnumBug) {
          for (i = 0, len = forceEnum.length; i < len; ++i) {
              key = forceEnum[i];
  
              if (owns(obj, key)) {
                  keys.push(key);
              }
          }
      }
  
      return keys;
  };
  
  /**
   * Returns an array containing the values of the object's enumerable keys.
   *
   * Note that values are returned in enumeration order (that is, in the same
   * order that they would be enumerated by a `for-in` loop), which may not be the
   * same as the order in which they were defined.
   *
   * @example
   *
   *     Y.Object.values({a: 'foo', b: 'bar', c: 'baz'});
   *     // => ['foo', 'bar', 'baz']
   *
   * @method values
   * @param {Object} obj An object.
   * @return {Array} Array of values.
   * @static
   */
  O.values = function (obj) {
      var keys   = O.keys(obj),
          i      = 0,
          len    = keys.length,
          values = [];
  
      for (; i < len; ++i) {
          values.push(obj[keys[i]]);
      }
  
      return values;
  };
  
  /**
   * Returns the number of enumerable keys owned by an object.
   *
   * @method size
   * @param {Object} obj An object.
   * @return {Number} The object's size.
   * @static
   */
  O.size = function (obj) {
      try {
          return O.keys(obj).length;
      } catch (ex) {
          return 0; // Legacy behavior for non-objects.
      }
  };
  
  /**
   * Returns `true` if the object owns an enumerable property with the specified
   * value.
   *
   * @method hasValue
   * @param {Object} obj An object.
   * @param {any} value The value to search for.
   * @return {Boolean} `true` if _obj_ contains _value_, `false` otherwise.
   * @static
   */
  O.hasValue = function (obj, value) {
      return Y.Array.indexOf(O.values(obj), value) > -1;
  };
  
  /**
   * Executes a function on each enumerable property in _obj_. The function
   * receives the value, the key, and the object itself as parameters (in that
   * order).
   *
   * By default, only properties owned by _obj_ are enumerated. To include
   * prototype properties, set the _proto_ parameter to `true`.
   *
   * @method each
   * @param {Object} obj Object to enumerate.
   * @param {Function} fn Function to execute on each enumerable property.
   *   @param {mixed} fn.value Value of the current property.
   *   @param {String} fn.key Key of the current property.
   *   @param {Object} fn.obj Object being enumerated.
   * @param {Object} [thisObj] `this` object to use when calling _fn_.
   * @param {Boolean} [proto=false] Include prototype properties.
   * @return {YUI} the YUI instance.
   * @chainable
   * @static
   */
  O.each = function (obj, fn, thisObj, proto) {
      var key;
  
      for (key in obj) {
          if (proto || owns(obj, key)) {
              fn.call(thisObj || Y, obj[key], key, obj);
          }
      }
  
      return Y;
  };
  
  /**
   * Executes a function on each enumerable property in _obj_, but halts if the
   * function returns a truthy value. The function receives the value, the key,
   * and the object itself as paramters (in that order).
   *
   * By default, only properties owned by _obj_ are enumerated. To include
   * prototype properties, set the _proto_ parameter to `true`.
   *
   * @method some
   * @param {Object} obj Object to enumerate.
   * @param {Function} fn Function to execute on each enumerable property.
   *   @param {mixed} fn.value Value of the current property.
   *   @param {String} fn.key Key of the current property.
   *   @param {Object} fn.obj Object being enumerated.
   * @param {Object} [thisObj] `this` object to use when calling _fn_.
   * @param {Boolean} [proto=false] Include prototype properties.
   * @return {Boolean} `true` if any execution of _fn_ returns a truthy value,
   *   `false` otherwise.
   * @static
   */
  O.some = function (obj, fn, thisObj, proto) {
      var key;
  
      for (key in obj) {
          if (proto || owns(obj, key)) {
              if (fn.call(thisObj || Y, obj[key], key, obj)) {
                  return true;
              }
          }
      }
  
      return false;
  };
  
  /**
   * Retrieves the sub value at the provided path,
   * from the value object provided.
   *
   * @method getValue
   * @static
   * @param o The object from which to extract the property value.
   * @param path {Array} A path array, specifying the object traversal path
   * from which to obtain the sub value.
   * @return {Any} The value stored in the path, undefined if not found,
   * undefined if the source is not an object.  Returns the source object
   * if an empty path is provided.
   */
  O.getValue = function(o, path) {
      if (!Y.Lang.isObject(o)) {
          return UNDEFINED;
      }
  
      var i,
          p = Y.Array(path),
          l = p.length;
  
      for (i = 0; o !== UNDEFINED && i < l; i++) {
          o = o[p[i]];
      }
  
      return o;
  };
  
  /**
   * Sets the sub-attribute value at the provided path on the
   * value object.  Returns the modified value object, or
   * undefined if the path is invalid.
   *
   * @method setValue
   * @static
   * @param o             The object on which to set the sub value.
   * @param path {Array}  A path array, specifying the object traversal path
   *                      at which to set the sub value.
   * @param val {Any}     The new value for the sub-attribute.
   * @return {Object}     The modified object, with the new sub value set, or
   *                      undefined, if the path was invalid.
   */
  O.setValue = function(o, path, val) {
      var i,
          p = Y.Array(path),
          leafIdx = p.length - 1,
          ref = o;
  
      if (leafIdx >= 0) {
          for (i = 0; ref !== UNDEFINED && i < leafIdx; i++) {
              ref = ref[p[i]];
          }
  
          if (ref !== UNDEFINED) {
              ref[p[i]] = val;
          } else {
              return UNDEFINED;
          }
      }
  
      return o;
  };
  
  /**
   * Returns `true` if the object has no enumerable properties of its own.
   *
   * @method isEmpty
   * @param {Object} obj An object.
   * @return {Boolean} `true` if the object is empty.
   * @static
   * @since 3.2.0
   */
  O.isEmpty = function (obj) {
      return !O.keys(obj).length;
  };
  /**
   * The YUI module contains the components required for building the YUI seed
   * file.  This includes the script loading mechanism, a simple queue, and the
   * core utilities for the library.
   * @module yui
   * @submodule yui-base
   */
  
  /**
   * YUI user agent detection.
   * Do not fork for a browser if it can be avoided.  Use feature detection when
   * you can.  Use the user agent as a last resort.  For all fields listed
   * as @type float, UA stores a version number for the browser engine,
   * 0 otherwise.  This value may or may not map to the version number of
   * the browser using the engine.  The value is presented as a float so
   * that it can easily be used for boolean evaluation as well as for
   * looking for a particular range of versions.  Because of this,
   * some of the granularity of the version info may be lost.  The fields that
   * are @type string default to null.  The API docs list the values that
   * these fields can have.
   * @class UA
   * @static
   */
  
  /**
  * Static method on `YUI.Env` for parsing a UA string.  Called at instantiation
  * to populate `Y.UA`.
  *
  * @static
  * @method parseUA
  * @param {String} [subUA=navigator.userAgent] UA string to parse
  * @returns {Object} The Y.UA object
  */
  YUI.Env.parseUA = function(subUA) {
  
      var numberify = function(s) {
              var c = 0;
              return parseFloat(s.replace(/\./g, function() {
                  return (c++ == 1) ? '' : '.';
              }));
          },
  
          win = Y.config.win,
  
          nav = win && win.navigator,
  
          o = {
  
          /**
           * Internet Explorer version number or 0.  Example: 6
           * @property ie
           * @type float
           * @static
           */
          ie: 0,
  
          /**
           * Opera version number or 0.  Example: 9.2
           * @property opera
           * @type float
           * @static
           */
          opera: 0,
  
          /**
           * Gecko engine revision number.  Will evaluate to 1 if Gecko
           * is detected but the revision could not be found. Other browsers
           * will be 0.  Example: 1.8
           * <pre>
           * Firefox 1.0.0.4: 1.7.8   <-- Reports 1.7
           * Firefox 1.5.0.9: 1.8.0.9 <-- 1.8
           * Firefox 2.0.0.3: 1.8.1.3 <-- 1.81
           * Firefox 3.0   <-- 1.9
           * Firefox 3.5   <-- 1.91
           * </pre>
           * @property gecko
           * @type float
           * @static
           */
          gecko: 0,
  
          /**
           * AppleWebKit version.  KHTML browsers that are not WebKit browsers
           * will evaluate to 1, other browsers 0.  Example: 418.9
           * <pre>
           * Safari 1.3.2 (312.6): 312.8.1 <-- Reports 312.8 -- currently the
           *                                   latest available for Mac OSX 10.3.
           * Safari 2.0.2:         416     <-- hasOwnProperty introduced
           * Safari 2.0.4:         418     <-- preventDefault fixed
           * Safari 2.0.4 (419.3): 418.9.1 <-- One version of Safari may run
           *                                   different versions of webkit
           * Safari 2.0.4 (419.3): 419     <-- Tiger installations that have been
           *                                   updated, but not updated
           *                                   to the latest patch.
           * Webkit 212 nightly:   522+    <-- Safari 3.0 precursor (with native
           * SVG and many major issues fixed).
           * Safari 3.0.4 (523.12) 523.12  <-- First Tiger release - automatic
           * update from 2.x via the 10.4.11 OS patch.
           * Webkit nightly 1/2008:525+    <-- Supports DOMContentLoaded event.
           *                                   yahoo.com user agent hack removed.
           * </pre>
           * http://en.wikipedia.org/wiki/Safari_version_history
           * @property webkit
           * @type float
           * @static
           */
          webkit: 0,
  
          /**
           * Safari will be detected as webkit, but this property will also
           * be populated with the Safari version number
           * @property safari
           * @type float
           * @static
           */
          safari: 0,
  
          /**
           * Chrome will be detected as webkit, but this property will also
           * be populated with the Chrome version number
           * @property chrome
           * @type float
           * @static
           */
          chrome: 0,
  
          /**
           * The mobile property will be set to a string containing any relevant
           * user agent information when a modern mobile browser is detected.
           * Currently limited to Safari on the iPhone/iPod Touch, Nokia N-series
           * devices with the WebKit-based browser, and Opera Mini.
           * @property mobile
           * @type string
           * @default null
           * @static
           */
          mobile: null,
  
          /**
           * Adobe AIR version number or 0.  Only populated if webkit is detected.
           * Example: 1.0
           * @property air
           * @type float
           */
          air: 0,
          /**
           * Detects Apple iPad's OS version
           * @property ipad
           * @type float
           * @static
           */
          ipad: 0,
          /**
           * Detects Apple iPhone's OS version
           * @property iphone
           * @type float
           * @static
           */
          iphone: 0,
          /**
           * Detects Apples iPod's OS version
           * @property ipod
           * @type float
           * @static
           */
          ipod: 0,
          /**
           * General truthy check for iPad, iPhone or iPod
           * @property ios
           * @type float
           * @default null
           * @static
           */
          ios: null,
          /**
           * Detects Googles Android OS version
           * @property android
           * @type float
           * @static
           */
          android: 0,
          /**
           * Detects Palms WebOS version
           * @property webos
           * @type float
           * @static
           */
          webos: 0,
  
          /**
           * Google Caja version number or 0.
           * @property caja
           * @type float
           */
          caja: nav && nav.cajaVersion,
  
          /**
           * Set to true if the page appears to be in SSL
           * @property secure
           * @type boolean
           * @static
           */
          secure: false,
  
          /**
           * The operating system.  Currently only detecting windows or macintosh
           * @property os
           * @type string
           * @default null
           * @static
           */
          os: null
  
      },
  
      ua = subUA || nav && nav.userAgent,
  
      loc = win && win.location,
  
      href = loc && loc.href,
  
      m;
  
      /**
      * The User Agent string that was parsed
      * @property userAgent
      * @type String
      * @static
      */
      o.userAgent = ua;
  
  
      o.secure = href && (href.toLowerCase().indexOf('https') === 0);
  
      if (ua) {
  
          if ((/windows|win32/i).test(ua)) {
              o.os = 'windows';
          } else if ((/macintosh/i).test(ua)) {
              o.os = 'macintosh';
          } else if ((/rhino/i).test(ua)) {
              o.os = 'rhino';
          }
  
          // Modern KHTML browsers should qualify as Safari X-Grade
          if ((/KHTML/).test(ua)) {
              o.webkit = 1;
          }
          // Modern WebKit browsers are at least X-Grade
          m = ua.match(/AppleWebKit\/([^\s]*)/);
          if (m && m[1]) {
              o.webkit = numberify(m[1]);
              o.safari = o.webkit;
  
              // Mobile browser check
              if (/ Mobile\//.test(ua)) {
                  o.mobile = 'Apple'; // iPhone or iPod Touch
  
                  m = ua.match(/OS ([^\s]*)/);
                  if (m && m[1]) {
                      m = numberify(m[1].replace('_', '.'));
                  }
                  o.ios = m;
                  o.ipad = o.ipod = o.iphone = 0;
  
                  m = ua.match(/iPad|iPod|iPhone/);
                  if (m && m[0]) {
                      o[m[0].toLowerCase()] = o.ios;
                  }
              } else {
                  m = ua.match(/NokiaN[^\/]*|webOS\/\d\.\d/);
                  if (m) {
                      // Nokia N-series, webOS, ex: NokiaN95
                      o.mobile = m[0];
                  }
                  if (/webOS/.test(ua)) {
                      o.mobile = 'WebOS';
                      m = ua.match(/webOS\/([^\s]*);/);
                      if (m && m[1]) {
                          o.webos = numberify(m[1]);
                      }
                  }
                  if (/ Android/.test(ua)) {
                      if (/Mobile/.test(ua)) {
                          o.mobile = 'Android';
                      }
                      m = ua.match(/Android ([^\s]*);/);
                      if (m && m[1]) {
                          o.android = numberify(m[1]);
                      }
  
                  }
              }
  
              m = ua.match(/Chrome\/([^\s]*)/);
              if (m && m[1]) {
                  o.chrome = numberify(m[1]); // Chrome
                  o.safari = 0; //Reset safari back to 0
              } else {
                  m = ua.match(/AdobeAIR\/([^\s]*)/);
                  if (m) {
                      o.air = m[0]; // Adobe AIR 1.0 or better
                  }
              }
          }
  
          if (!o.webkit) { // not webkit
  // @todo check Opera/8.01 (J2ME/MIDP; Opera Mini/2.0.4509/1316; fi; U; ssr)
              m = ua.match(/Opera[\s\/]([^\s]*)/);
              if (m && m[1]) {
                  o.opera = numberify(m[1]);
                  m = ua.match(/Version\/([^\s]*)/);
                  if (m && m[1]) {
                      o.opera = numberify(m[1]); // opera 10+
                  }
  
                  m = ua.match(/Opera Mini[^;]*/);
  
                  if (m) {
                      o.mobile = m[0]; // ex: Opera Mini/2.0.4509/1316
                  }
              } else { // not opera or webkit
                  m = ua.match(/MSIE\s([^;]*)/);
                  if (m && m[1]) {
                      o.ie = numberify(m[1]);
                  } else { // not opera, webkit, or ie
                      m = ua.match(/Gecko\/([^\s]*)/);
                      if (m) {
                          o.gecko = 1; // Gecko detected, look for revision
                          m = ua.match(/rv:([^\s\)]*)/);
                          if (m && m[1]) {
                              o.gecko = numberify(m[1]);
                          }
                      }
                  }
              }
          }
      }
  
      //It was a parsed UA, do not assign the global value.
      if (!subUA) {
          YUI.Env.UA = o;
      }
  
      return o;
  };
  
  
  Y.UA = YUI.Env.UA || YUI.Env.parseUA();
  YUI.Env.aliases = {
      "anim": ["anim-base","anim-color","anim-curve","anim-easing","anim-node-plugin","anim-scroll","anim-xy"],
      "app": ["controller","model","model-list","view"],
      "attribute": ["attribute-base","attribute-complex"],
      "autocomplete": ["autocomplete-base","autocomplete-sources","autocomplete-list","autocomplete-plugin"],
      "base": ["base-base","base-pluginhost","base-build"],
      "cache": ["cache-base","cache-offline","cache-plugin"],
      "collection": ["array-extras","arraylist","arraylist-add","arraylist-filter","array-invoke"],
      "dataschema": ["dataschema-base","dataschema-json","dataschema-xml","dataschema-array","dataschema-text"],
      "datasource": ["datasource-local","datasource-io","datasource-get","datasource-function","datasource-cache","datasource-jsonschema","datasource-xmlschema","datasource-arrayschema","datasource-textschema","datasource-polling"],
      "datatable": ["datatable-base","datatable-datasource","datatable-sort","datatable-scroll"],
      "datatype": ["datatype-number","datatype-date","datatype-xml"],
      "datatype-date": ["datatype-date-parse","datatype-date-format"],
      "datatype-number": ["datatype-number-parse","datatype-number-format"],
      "datatype-xml": ["datatype-xml-parse","datatype-xml-format"],
      "dd": ["dd-ddm-base","dd-ddm","dd-ddm-drop","dd-drag","dd-proxy","dd-constrain","dd-drop","dd-scroll","dd-delegate"],
      "dom": ["dom-base","dom-screen","dom-style","selector-native","selector"],
      "editor": ["frame","selection","exec-command","editor-base","editor-para","editor-br","editor-bidi","editor-tab","createlink-base"],
      "event": ["event-base","event-delegate","event-synthetic","event-mousewheel","event-mouseenter","event-key","event-focus","event-resize","event-hover","event-outside"],
      "event-custom": ["event-custom-base","event-custom-complex"],
      "event-gestures": ["event-flick","event-move"],
      "highlight": ["highlight-base","highlight-accentfold"],
      "history": ["history-base","history-hash","history-hash-ie","history-html5"],
      "io": ["io-base","io-xdr","io-form","io-upload-iframe","io-queue"],
      "json": ["json-parse","json-stringify"],
      "loader": ["loader-base","loader-rollup","loader-yui3"],
      "node": ["node-base","node-event-delegate","node-pluginhost","node-screen","node-style"],
      "pluginhost": ["pluginhost-base","pluginhost-config"],
      "querystring": ["querystring-parse","querystring-stringify"],
      "recordset": ["recordset-base","recordset-sort","recordset-filter","recordset-indexer"],
      "resize": ["resize-base","resize-proxy","resize-constrain"],
      "slider": ["slider-base","slider-value-range","clickable-rail","range-slider"],
      "text": ["text-accentfold","text-wordbreak"],
      "widget": ["widget-base","widget-htmlparser","widget-uievents","widget-skin"]
  };
  
  
  }, '@VERSION@' );
  