/*  Prototype JavaScript framework, version 1.4.0
	 *  (c) 2005 Sam Stephenson <sam@conio.net>
	 *
	 *  THIS FILE IS AUTOMATICALLY GENERATED. When sending patches, please diff
	 *  against the source tree, available from the Prototype darcs repository.
	 *
	 *  Prototype is freely distributable under the terms of an MIT-style license.
	 *
	 *  For details, see the Prototype web site: http://prototype.conio.net/
	 *
	/*--------------------------------------------------------------------------*/

	var Prototype = {
	  Version: '1.4.0',
	  ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',

	  emptyFunction: function() {},
	  K: function(x) {return x}
	}

	var Class = {
	  create: function() {
	    return function() {
	      this.initialize.apply(this, arguments);
	    }
	  }
	}

	var Abstract = new Object();

	Object.extend = function(destination, source) {
	  for (property in source) {
	    destination[property] = source[property];
	  }
	  return destination;
	}

	Object.inspect = function(object) {
	  try {
	    if (object == undefined) return 'undefined';
	    if (object == null) return 'null';
	    return object.inspect ? object.inspect() : object.toString();
	  } catch (e) {
	    if (e instanceof RangeError) return '...';
	    throw e;
	  }
	}

	Function.prototype.bind = function() {
	  var __method = this, args = $A(arguments), object = args.shift();
	  return function() {
	    return __method.apply(object, args.concat($A(arguments)));
	  }
	}

	Function.prototype.bindAsEventListener = function(object) {
	  var __method = this;
	  return function(event) {
	    return __method.call(object, event || window.event);
	  }
	}

	Object.extend(Number.prototype, {
	  toColorPart: function() {
	    var digits = this.toString(16);
	    if (this < 16) return '0' + digits;
	    return digits;
	  },

	  succ: function() {
	    return this + 1;
	  },

	  times: function(iterator) {
	    $R(0, this, true).each(iterator);
	    return this;
	  }
	});

	var Try = {
	  these: function() {
	    var returnValue;

	    for (var i = 0; i < arguments.length; i++) {
	      var lambda = arguments[i];
	      try {
	        returnValue = lambda();
	        break;
	      } catch (e) {}
	    }

	    return returnValue;
	  }
	}

	/*--------------------------------------------------------------------------*/

	var PeriodicalExecuter = Class.create();
	PeriodicalExecuter.prototype = {
	  initialize: function(callback, frequency) {
	    this.callback = callback;
	    this.frequency = frequency;
	    this.currentlyExecuting = false;

	    this.registerCallback();
	  },

	  registerCallback: function() {
	    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
	  },

	  onTimerEvent: function() {
	    if (!this.currentlyExecuting) {
	      try {
	        this.currentlyExecuting = true;
	        this.callback();
	      } finally {
	        this.currentlyExecuting = false;
	      }
	    }
	  }
	}

	/*--------------------------------------------------------------------------*/

	function $() {
	  var elements = new Array();

	  for (var i = 0; i < arguments.length; i++) {
	    var element = arguments[i];
	    if (typeof element == 'string')
	      element = document.getElementById(element);

	    if (arguments.length == 1)
	      return element;

	    elements.push(element);
	  }

	  return elements;
	}
	Object.extend(String.prototype, {
	  stripTags: function() {
	    return this.replace(/<\/?[^>]+>/gi, '');
	  },

	  stripScripts: function() {
	    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
	  },

	  extractScripts: function() {
	    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
	    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
	    return (this.match(matchAll) || []).map(function(scriptTag) {
	      return (scriptTag.match(matchOne) || ['', ''])[1];
	    });
	  },

	  evalScripts: function() {
	    return this.extractScripts().map(eval);
	  },

	  escapeHTML: function() {
	    var div = document.createElement('div');
	    var text = document.createTextNode(this);
	    div.appendChild(text);
	    return div.innerHTML;
	  },

	  unescapeHTML: function() {
	    var div = document.createElement('div');
	    div.innerHTML = this.stripTags();
	    return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
	  },

	  toQueryParams: function() {
	    var pairs = this.match(/^\??(.*)$/)[1].split('&');
	    return pairs.inject({}, function(params, pairString) {
	      var pair = pairString.split('=');
	      params[pair[0]] = pair[1];
	      return params;
	    });
	  },

	  toArray: function() {
	    return this.split('');
	  },

	  camelize: function() {
	    var oStringList = this.split('-');
	    if (oStringList.length == 1) return oStringList[0];

	    var camelizedString = this.indexOf('-') == 0
	      ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
	      : oStringList[0];

	    for (var i = 1, len = oStringList.length; i < len; i++) {
	      var s = oStringList[i];
	      camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
	    }

	    return camelizedString;
	  },

	  inspect: function() {
	    return "'" + this.replace('\\', '\\\\').replace("'", '\\\'') + "'";
	  }
	});

	String.prototype.parseQuery = String.prototype.toQueryParams;

	var $break    = new Object();
	var $continue = new Object();

	var Enumerable = {
	  each: function(iterator) {
	    var index = 0;
	    try {
	      this._each(function(value) {
	        try {
	          iterator(value, index++);
	        } catch (e) {
	          if (e != $continue) throw e;
	        }
	      });
	    } catch (e) {
	      if (e != $break) throw e;
	    }
	  },

	  all: function(iterator) {
	    var result = true;
	    this.each(function(value, index) {
	      result = result && !!(iterator || Prototype.K)(value, index);
	      if (!result) throw $break;
	    });
	    return result;
	  },

	  any: function(iterator) {
	    var result = true;
	    this.each(function(value, index) {
	      if (result = !!(iterator || Prototype.K)(value, index))
	        throw $break;
	    });
	    return result;
	  },

	  collect: function(iterator) {
	    var results = [];
	    this.each(function(value, index) {
	      results.push(iterator(value, index));
	    });
	    return results;
	  },

	  detect: function (iterator) {
	    var result;
	    this.each(function(value, index) {
	      if (iterator(value, index)) {
	        result = value;
	        throw $break;
	      }
	    });
	    return result;
	  },

	  findAll: function(iterator) {
	    var results = [];
	    this.each(function(value, index) {
	      if (iterator(value, index))
	        results.push(value);
	    });
	    return results;
	  },

	  grep: function(pattern, iterator) {
	    var results = [];
	    this.each(function(value, index) {
	      var stringValue = value.toString();
	      if (stringValue.match(pattern))
	        results.push((iterator || Prototype.K)(value, index));
	    })
	    return results;
	  },

	  include: function(object) {
	    var found = false;
	    this.each(function(value) {
	      if (value == object) {
	        found = true;
	        throw $break;
	      }
	    });
	    return found;
	  },

	  inject: function(memo, iterator) {
	    this.each(function(value, index) {
	      memo = iterator(memo, value, index);
	    });
	    return memo;
	  },

	  invoke: function(method) {
	    var args = $A(arguments).slice(1);
	    return this.collect(function(value) {
	      return value[method].apply(value, args);
	    });
	  },

	  max: function(iterator) {
	    var result;
	    this.each(function(value, index) {
	      value = (iterator || Prototype.K)(value, index);
	      if (value >= (result || value))
	        result = value;
	    });
	    return result;
	  },

	  min: function(iterator) {
	    var result;
	    this.each(function(value, index) {
	      value = (iterator || Prototype.K)(value, index);
	      if (value <= (result || value))
	        result = value;
	    });
	    return result;
	  },

	  partition: function(iterator) {
	    var trues = [], falses = [];
	    this.each(function(value, index) {
	      ((iterator || Prototype.K)(value, index) ?
	        trues : falses).push(value);
	    });
	    return [trues, falses];
	  },

	  pluck: function(property) {
	    var results = [];
	    this.each(function(value, index) {
	      results.push(value[property]);
	    });
	    return results;
	  },

	  reject: function(iterator) {
	    var results = [];
	    this.each(function(value, index) {
	      if (!iterator(value, index))
	        results.push(value);
	    });
	    return results;
	  },

	  sortBy: function(iterator) {
	    return this.collect(function(value, index) {
	      return {value: value, criteria: iterator(value, index)};
	    }).sort(function(left, right) {
	      var a = left.criteria, b = right.criteria;
	      return a < b ? -1 : a > b ? 1 : 0;
	    }).pluck('value');
	  },

	  toArray: function() {
	    return this.collect(Prototype.K);
	  },

	  zip: function() {
	    var iterator = Prototype.K, args = $A(arguments);
	    if (typeof args.last() == 'function')
	      iterator = args.pop();

	    var collections = [this].concat(args).map($A);
	    return this.map(function(value, index) {
	      iterator(value = collections.pluck(index));
	      return value;
	    });
	  },

	  inspect: function() {
	    return '#<Enumerable:' + this.toArray().inspect() + '>';
	  }
	}

	Object.extend(Enumerable, {
	  map:     Enumerable.collect,
	  find:    Enumerable.detect,
	  select:  Enumerable.findAll,
	  member:  Enumerable.include,
	  entries: Enumerable.toArray
	});
	var $A = Array.from = function(iterable) {
	  if (!iterable) return [];
	  if (iterable.toArray) {
	    return iterable.toArray();
	  } else {
	    var results = [];
	    for (var i = 0; i < iterable.length; i++)
	      results.push(iterable[i]);
	    return results;
	  }
	}

	Object.extend(Array.prototype, Enumerable);

	Array.prototype._reverse = Array.prototype.reverse;

	Object.extend(Array.prototype, {
	  _each: function(iterator) {
	    for (var i = 0; i < this.length; i++)
	      iterator(this[i]);
	  },

	  clear: function() {
	    this.length = 0;
	    return this;
	  },

	  first: function() {
	    return this[0];
	  },

	  last: function() {
	    return this[this.length - 1];
	  },

	  compact: function() {
	    return this.select(function(value) {
	      return value != undefined || value != null;
	    });
	  },

	  flatten: function() {
	    return this.inject([], function(array, value) {
	      return array.concat(value.constructor == Array ?
	        value.flatten() : [value]);
	    });
	  },

	  without: function() {
	    var values = $A(arguments);
	    return this.select(function(value) {
	      return !values.include(value);
	    });
	  },

	  indexOf: function(object) {
	    for (var i = 0; i < this.length; i++)
	      if (this[i] == object) return i;
	    return -1;
	  },

	  reverse: function(inline) {
	    return (inline !== false ? this : this.toArray())._reverse();
	  },

	  shift: function() {
	    var result = this[0];
	    for (var i = 0; i < this.length - 1; i++)
	      this[i] = this[i + 1];
	    this.length--;
	    return result;
	  },

	  inspect: function() {
	    return '[' + this.map(Object.inspect).join(', ') + ']';
	  }
	});
	var Hash = {
	  _each: function(iterator) {
	    for (key in this) {
	      var value = this[key];
	      if (typeof value == 'function') continue;

	      var pair = [key, value];
	      pair.key = key;
	      pair.value = value;
	      iterator(pair);
	    }
	  },

	  keys: function() {
	    return this.pluck('key');
	  },

	  values: function() {
	    return this.pluck('value');
	  },

	  merge: function(hash) {
	    return $H(hash).inject($H(this), function(mergedHash, pair) {
	      mergedHash[pair.key] = pair.value;
	      return mergedHash;
	    });
	  },

	  toQueryString: function() {
	    return this.map(function(pair) {
	      return pair.map(encodeURIComponent).join('=');
	    }).join('&');
	  },

	  inspect: function() {
	    return '#<Hash:{' + this.map(function(pair) {
	      return pair.map(Object.inspect).join(': ');
	    }).join(', ') + '}>';
	  }
	}

	function $H(object) {
	  var hash = Object.extend({}, object || {});
	  Object.extend(hash, Enumerable);
	  Object.extend(hash, Hash);
	  return hash;
	}
	ObjectRange = Class.create();
	Object.extend(ObjectRange.prototype, Enumerable);
	Object.extend(ObjectRange.prototype, {
	  initialize: function(start, end, exclusive) {
	    this.start = start;
	    this.end = end;
	    this.exclusive = exclusive;
	  },

	  _each: function(iterator) {
	    var value = this.start;
	    do {
	      iterator(value);
	      value = value.succ();
	    } while (this.include(value));
	  },

	  include: function(value) {
	    if (value < this.start)
	      return false;
	    if (this.exclusive)
	      return value < this.end;
	    return value <= this.end;
	  }
	});

	var $R = function(start, end, exclusive) {
	  return new ObjectRange(start, end, exclusive);
	}

	var Ajax = {
	  getTransport: function() {
	    return Try.these(
	      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
	      function() {return new ActiveXObject('Microsoft.XMLHTTP')},
	      function() {return new XMLHttpRequest()}
	    ) || false;
	  },

	  activeRequestCount: 0
	}

	Ajax.Responders = {
	  responders: [],

	  _each: function(iterator) {
	    this.responders._each(iterator);
	  },

	  register: function(responderToAdd) {
	    if (!this.include(responderToAdd))
	      this.responders.push(responderToAdd);
	  },

	  unregister: function(responderToRemove) {
	    this.responders = this.responders.without(responderToRemove);
	  },

	  dispatch: function(callback, request, transport, json) {
	    this.each(function(responder) {
	      if (responder[callback] && typeof responder[callback] == 'function') {
	        try {
	          responder[callback].apply(responder, [request, transport, json]);
	        } catch (e) {}
	      }
	    });
	  }
	};

	Object.extend(Ajax.Responders, Enumerable);

	Ajax.Responders.register({
	  onCreate: function() {
	    Ajax.activeRequestCount++;
	  },

	  onComplete: function() {
	    Ajax.activeRequestCount--;
	  }
	});

	Ajax.Base = function() {};
	Ajax.Base.prototype = {
	  setOptions: function(options) {
	    this.options = {
	      method:       'post',
	      asynchronous: true,
	      parameters:   ''
	    }
	    Object.extend(this.options, options || {});
	  },

	  responseIsSuccess: function() {
	    return this.transport.status == undefined
	        || this.transport.status == 0
	        || (this.transport.status >= 200 && this.transport.status < 300);
	  },

	  responseIsFailure: function() {
	    return !this.responseIsSuccess();
	  }
	}

	Ajax.Request = Class.create();
	Ajax.Request.Events =
	  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

	Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
	  initialize: function(url, options) {
	    this.transport = Ajax.getTransport();
	    this.setOptions(options);
	    this.request(url);
	  },

	  request: function(url) {
	    var parameters = this.options.parameters || '';
	    if (parameters.length > 0) parameters += '&_=';

	    try {
	      this.url = url;
	      if (this.options.method == 'get' && parameters.length > 0)
	        this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;

	      Ajax.Responders.dispatch('onCreate', this, this.transport);

	      this.transport.open(this.options.method, this.url,
	        this.options.asynchronous);

	      if (this.options.asynchronous) {
	        this.transport.onreadystatechange = this.onStateChange.bind(this);
	        setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
	      }

	      this.setRequestHeaders();

	      var body = this.options.postBody ? this.options.postBody : parameters;
	      this.transport.send(this.options.method == 'post' ? body : null);

	    } catch (e) {
	      this.dispatchException(e);
	    }
	  },

	  setRequestHeaders: function() {
	    var requestHeaders =
	      ['X-Requested-With', 'XMLHttpRequest',
	       'X-Prototype-Version', Prototype.Version];

	    if (this.options.method == 'post') {
	      requestHeaders.push('Content-type',
	        'application/x-www-form-urlencoded');

	      /* Force "Connection: close" for Mozilla browsers to work around
	       * a bug where XMLHttpReqeuest sends an incorrect Content-length
	       * header. See Mozilla Bugzilla #246651.
	       */
	      if (this.transport.overrideMimeType)
	        requestHeaders.push('Connection', 'close');
	    }

	    if (this.options.requestHeaders)
	      requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);

	    for (var i = 0; i < requestHeaders.length; i += 2)
	      this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
	  },

	  onStateChange: function() {
	    var readyState = this.transport.readyState;
	    if (readyState != 1)
	      this.respondToReadyState(this.transport.readyState);
	  },

	  header: function(name) {
	    try {
	      return this.transport.getResponseHeader(name);
	    } catch (e) {}
	  },

	  evalJSON: function() {
	    try {
	      return eval(this.header('X-JSON'));
	    } catch (e) {}
	  },

	  evalResponse: function() {
	    try {
	      return eval(this.transport.responseText);
	    } catch (e) {
	      this.dispatchException(e);
	    }
	  },

	  respondToReadyState: function(readyState) {
	    var event = Ajax.Request.Events[readyState];
	    var transport = this.transport, json = this.evalJSON();

	    if (event == 'Complete') {
	      try {
	        (this.options['on' + this.transport.status]
	         || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
	         || Prototype.emptyFunction)(transport, json);
	      } catch (e) {
	        this.dispatchException(e);
	      }

	      if ((this.header('Content-type') || '').match(/^text\/javascript/i))
	        this.evalResponse();
	    }

	    try {
	      (this.options['on' + event] || Prototype.emptyFunction)(transport, json);
	      Ajax.Responders.dispatch('on' + event, this, transport, json);
	    } catch (e) {
	      this.dispatchException(e);
	    }

	    /* Avoid memory leak in MSIE: clean up the oncomplete event handler */
	    if (event == 'Complete')
	      this.transport.onreadystatechange = Prototype.emptyFunction;
	  },

	  dispatchException: function(exception) {
	    (this.options.onException || Prototype.emptyFunction)(this, exception);
	    Ajax.Responders.dispatch('onException', this, exception);
	  }
	});

	Ajax.Updater = Class.create();

	Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
	  initialize: function(container, url, options) {
	    this.containers = {
	      success: container.success ? $(container.success) : $(container),
	      failure: container.failure ? $(container.failure) :
	        (container.success ? null : $(container))
	    }

	    this.transport = Ajax.getTransport();
	    this.setOptions(options);

	    var onComplete = this.options.onComplete || Prototype.emptyFunction;
	    this.options.onComplete = (function(transport, object) {
	      this.updateContent();
	      onComplete(transport, object);
	    }).bind(this);

	    this.request(url);
	  },

	  updateContent: function() {
	    var receiver = this.responseIsSuccess() ?
	      this.containers.success : this.containers.failure;
	    var response = this.transport.responseText;

	    if (!this.options.evalScripts)
	      response = response.stripScripts();

	    if (receiver) {
	      if (this.options.insertion) {
	        new this.options.insertion(receiver, response);
	      } else {
	        Element.update(receiver, response);
	      }
	    }

	    if (this.responseIsSuccess()) {
	      if (this.onComplete)
	        setTimeout(this.onComplete.bind(this), 10);
	    }
	  }
	});

	Ajax.PeriodicalUpdater = Class.create();
	Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
	  initialize: function(container, url, options) {
	    this.setOptions(options);
	    this.onComplete = this.options.onComplete;

	    this.frequency = (this.options.frequency || 2);
	    this.decay = (this.options.decay || 1);

	    this.updater = {};
	    this.container = container;
	    this.url = url;

	    this.start();
	  },

	  start: function() {
	    this.options.onComplete = this.updateComplete.bind(this);
	    this.onTimerEvent();
	  },

	  stop: function() {
	    this.updater.onComplete = undefined;
	    clearTimeout(this.timer);
	    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
	  },

	  updateComplete: function(request) {
	    if (this.options.decay) {
	      this.decay = (request.responseText == this.lastText ?
	        this.decay * this.options.decay : 1);

	      this.lastText = request.responseText;
	    }
	    this.timer = setTimeout(this.onTimerEvent.bind(this),
	      this.decay * this.frequency * 1000);
	  },

	  onTimerEvent: function() {
	    this.updater = new Ajax.Updater(this.container, this.url, this.options);
	  }
	});
	document.getElementsByClassName = function(className, parentElement) {
	  var children = ($(parentElement) || document.body).getElementsByTagName('*');
	  return $A(children).inject([], function(elements, child) {
	    if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
	      elements.push(child);
	    return elements;
	  });
	}

	/*--------------------------------------------------------------------------*/

	if (!window.Element) {
	  var Element = new Object();
	}

	Object.extend(Element, {
	  visible: function(element) {
	    return $(element).style.display != 'none';
	  },

	  toggle: function() {
	    for (var i = 0; i < arguments.length; i++) {
	      var element = $(arguments[i]);
	      Element[Element.visible(element) ? 'hide' : 'show'](element);
	    }
	  },

	  hide: function() {
	    for (var i = 0; i < arguments.length; i++) {
	      var element = $(arguments[i]);
	      element.style.display = 'none';
	    }
	  },

	  show: function() {
	    for (var i = 0; i < arguments.length; i++) {
	      var element = $(arguments[i]);
	      element.style.display = '';
	    }
	  },

	  remove: function(element) {
	    element = $(element);
	    element.parentNode.removeChild(element);
	  },

	  update: function(element, html) {
	    $(element).innerHTML = html.stripScripts();
	    setTimeout(function() {html.evalScripts()}, 10);
	  },

	  getHeight: function(element) {
	    element = $(element);
	    return element.offsetHeight;
	  },

	  classNames: function(element) {
	    return new Element.ClassNames(element);
	  },

	  hasClassName: function(element, className) {
	    if (!(element = $(element))) return;
	    return Element.classNames(element).include(className);
	  },

	  addClassName: function(element, className) {
	    if (!(element = $(element))) return;
	    return Element.classNames(element).add(className);
	  },

	  removeClassName: function(element, className) {
	    if (!(element = $(element))) return;
	    return Element.classNames(element).remove(className);
	  },

	  // removes whitespace-only text node children
	  cleanWhitespace: function(element) {
	    element = $(element);
	    for (var i = 0; i < element.childNodes.length; i++) {
	      var node = element.childNodes[i];
	      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
	        Element.remove(node);
	    }
	  },

	  empty: function(element) {
	    return $(element).innerHTML.match(/^\s*$/);
	  },

	  scrollTo: function(element) {
	    element = $(element);
	    var x = element.x ? element.x : element.offsetLeft,
	        y = element.y ? element.y : element.offsetTop;
	    window.scrollTo(x, y);
	  },

	  getStyle: function(element, style) {
	    element = $(element);
	    var value = element.style[style.camelize()];
	    if (!value) {
	      if (document.defaultView && document.defaultView.getComputedStyle) {
	        var css = document.defaultView.getComputedStyle(element, null);
	        value = css ? css.getPropertyValue(style) : null;
	      } else if (element.currentStyle) {
	        value = element.currentStyle[style.camelize()];
	      }
	    }

	    if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
	      if (Element.getStyle(element, 'position') == 'static') value = 'auto';

	    return value == 'auto' ? null : value;
	  },

	  setStyle: function(element, style) {
	    element = $(element);
	    for (name in style)
	      element.style[name.camelize()] = style[name];
	  },

	  getDimensions: function(element) {
	    element = $(element);
	    if (Element.getStyle(element, 'display') != 'none')
	      return {width: element.offsetWidth, height: element.offsetHeight};

	    // All *Width and *Height properties give 0 on elements with display none,
	    // so enable the element temporarily
	    var els = element.style;
	    var originalVisibility = els.visibility;
	    var originalPosition = els.position;
	    els.visibility = 'hidden';
	    els.position = 'absolute';
	    els.display = '';
	    var originalWidth = element.clientWidth;
	    var originalHeight = element.clientHeight;
	    els.display = 'none';
	    els.position = originalPosition;
	    els.visibility = originalVisibility;
	    return {width: originalWidth, height: originalHeight};
	  },

	  makePositioned: function(element) {
	    element = $(element);
	    var pos = Element.getStyle(element, 'position');
	    if (pos == 'static' || !pos) {
	      element._madePositioned = true;
	      element.style.position = 'relative';
	      // Opera returns the offset relative to the positioning context, when an
	      // element is position relative but top and left have not been defined
	      if (window.opera) {
	        element.style.top = 0;
	        element.style.left = 0;
	      }
	    }
	  },

	  undoPositioned: function(element) {
	    element = $(element);
	    if (element._madePositioned) {
	      element._madePositioned = undefined;
	      element.style.position =
	        element.style.top =
	        element.style.left =
	        element.style.bottom =
	        element.style.right = '';
	    }
	  },

	  makeClipping: function(element) {
	    element = $(element);
	    if (element._overflow) return;
	    element._overflow = element.style.overflow;
	    if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
	      element.style.overflow = 'hidden';
	  },

	  undoClipping: function(element) {
	    element = $(element);
	    if (element._overflow) return;
	    element.style.overflow = element._overflow;
	    element._overflow = undefined;
	  }
	});

	var Toggle = new Object();
	Toggle.display = Element.toggle;

	/*--------------------------------------------------------------------------*/

	Abstract.Insertion = function(adjacency) {
	  this.adjacency = adjacency;
	}

	Abstract.Insertion.prototype = {
	  initialize: function(element, content) {
	    this.element = $(element);
	    this.content = content.stripScripts();

	    if (this.adjacency && this.element.insertAdjacentHTML) {
	      try {
	        this.element.insertAdjacentHTML(this.adjacency, this.content);
	      } catch (e) {
	        if (this.element.tagName.toLowerCase() == 'tbody') {
	          this.insertContent(this.contentFromAnonymousTable());
	        } else {
	          throw e;
	        }
	      }
	    } else {
	      this.range = this.element.ownerDocument.createRange();
	      if (this.initializeRange) this.initializeRange();
	      this.insertContent([this.range.createContextualFragment(this.content)]);
	    }

	    setTimeout(function() {content.evalScripts()}, 10);
	  },

	  contentFromAnonymousTable: function() {
	    var div = document.createElement('div');
	    div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
	    return $A(div.childNodes[0].childNodes[0].childNodes);
	  }
	}

	var Insertion = new Object();

	Insertion.Before = Class.create();
	Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
	  initializeRange: function() {
	    this.range.setStartBefore(this.element);
	  },

	  insertContent: function(fragments) {
	    fragments.each((function(fragment) {
	      this.element.parentNode.insertBefore(fragment, this.element);
	    }).bind(this));
	  }
	});

	Insertion.Top = Class.create();
	Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
	  initializeRange: function() {
	    this.range.selectNodeContents(this.element);
	    this.range.collapse(true);
	  },

	  insertContent: function(fragments) {
	    fragments.reverse(false).each((function(fragment) {
	      this.element.insertBefore(fragment, this.element.firstChild);
	    }).bind(this));
	  }
	});

	Insertion.Bottom = Class.create();
	Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
	  initializeRange: function() {
	    this.range.selectNodeContents(this.element);
	    this.range.collapse(this.element);
	  },

	  insertContent: function(fragments) {
	    fragments.each((function(fragment) {
	      this.element.appendChild(fragment);
	    }).bind(this));
	  }
	});

	Insertion.After = Class.create();
	Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
	  initializeRange: function() {
	    this.range.setStartAfter(this.element);
	  },

	  insertContent: function(fragments) {
	    fragments.each((function(fragment) {
	      this.element.parentNode.insertBefore(fragment,
	        this.element.nextSibling);
	    }).bind(this));
	  }
	});

	/*--------------------------------------------------------------------------*/

	Element.ClassNames = Class.create();
	Element.ClassNames.prototype = {
	  initialize: function(element) {
	    this.element = $(element);
	  },

	  _each: function(iterator) {
	    this.element.className.split(/\s+/).select(function(name) {
	      return name.length > 0;
	    })._each(iterator);
	  },

	  set: function(className) {
	    this.element.className = className;
	  },

	  add: function(classNameToAdd) {
	    if (this.include(classNameToAdd)) return;
	    this.set(this.toArray().concat(classNameToAdd).join(' '));
	  },

	  remove: function(classNameToRemove) {
	    if (!this.include(classNameToRemove)) return;
	    this.set(this.select(function(className) {
	      return className != classNameToRemove;
	    }).join(' '));
	  },

	  toString: function() {
	    return this.toArray().join(' ');
	  }
	}

	Object.extend(Element.ClassNames.prototype, Enumerable);
	var Field = {
	  clear: function() {
	    for (var i = 0; i < arguments.length; i++)
	      $(arguments[i]).value = '';
	  },

	  focus: function(element) {
	    $(element).focus();
	  },

	  present: function() {
	    for (var i = 0; i < arguments.length; i++)
	      if ($(arguments[i]).value == '') return false;
	    return true;
	  },

	  select: function(element) {
	    $(element).select();
	  },

	  activate: function(element) {
	    element = $(element);
	    element.focus();
	    if (element.select)
	      element.select();
	  }
	}

	/*--------------------------------------------------------------------------*/

	var Form = {
	  serialize: function(form) {
	    var elements = Form.getElements($(form));
	    var queryComponents = new Array();

	    for (var i = 0; i < elements.length; i++) {
	      var queryComponent = Form.Element.serialize(elements[i]);
	      if (queryComponent)
	        queryComponents.push(queryComponent);
	    }

	    return queryComponents.join('&');
	  },

	  getElements: function(form) {
	    form = $(form);
	    var elements = new Array();

	    for (tagName in Form.Element.Serializers) {
	      var tagElements = form.getElementsByTagName(tagName);
	      for (var j = 0; j < tagElements.length; j++)
	        elements.push(tagElements[j]);
	    }
	    return elements;
	  },

	  getInputs: function(form, typeName, name) {
	    form = $(form);
	    var inputs = form.getElementsByTagName('input');

	    if (!typeName && !name)
	      return inputs;

	    var matchingInputs = new Array();
	    for (var i = 0; i < inputs.length; i++) {
	      var input = inputs[i];
	      if ((typeName && input.type != typeName) ||
	          (name && input.name != name))
	        continue;
	      matchingInputs.push(input);
	    }

	    return matchingInputs;
	  },

	  disable: function(form) {
	    var elements = Form.getElements(form);
	    for (var i = 0; i < elements.length; i++) {
	      var element = elements[i];
	      element.blur();
	      element.disabled = 'true';
	    }
	  },

	  enable: function(form) {
	    var elements = Form.getElements(form);
	    for (var i = 0; i < elements.length; i++) {
	      var element = elements[i];
	      element.disabled = '';
	    }
	  },

	  findFirstElement: function(form) {
	    return Form.getElements(form).find(function(element) {
	      return element.type != 'hidden' && !element.disabled &&
	        ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
	    });
	  },

	  focusFirstElement: function(form) {
	    Field.activate(Form.findFirstElement(form));
	  },

	  reset: function(form) {
	    $(form).reset();
	  }
	}

	Form.Element = {
	  serialize: function(element) {
	    element = $(element);
	    var method = element.tagName.toLowerCase();
	    var parameter = Form.Element.Serializers[method](element);

	    if (parameter) {
	      var key = encodeURIComponent(parameter[0]);
	      if (key.length == 0) return;

	      if (parameter[1].constructor != Array)
	        parameter[1] = [parameter[1]];

	      return parameter[1].map(function(value) {
	        return key + '=' + encodeURIComponent(value);
	      }).join('&');
	    }
	  },

	  getValue: function(element) {
	    element = $(element);
	    var method = element.tagName.toLowerCase();
	    var parameter = Form.Element.Serializers[method](element);

	    if (parameter)
	      return parameter[1];
	  }
	}

	Form.Element.Serializers = {
	  input: function(element) {
	    switch (element.type.toLowerCase()) {
	      case 'submit':
	      case 'hidden':
	      case 'password':
	      case 'text':
	        return Form.Element.Serializers.textarea(element);
	      case 'checkbox':
	      case 'radio':
	        return Form.Element.Serializers.inputSelector(element);
	    }
	    return false;
	  },

	  inputSelector: function(element) {
	    if (element.checked)
	      return [element.name, element.value];
	  },

	  textarea: function(element) {
	    return [element.name, element.value];
	  },

	  select: function(element) {
	    return Form.Element.Serializers[element.type == 'select-one' ?
	      'selectOne' : 'selectMany'](element);
	  },

	  selectOne: function(element) {
	    var value = '', opt, index = element.selectedIndex;
	    if (index >= 0) {
	      opt = element.options[index];
	      value = opt.value;
	      if (!value && !('value' in opt))
	        value = opt.text;
	    }
	    return [element.name, value];
	  },

	  selectMany: function(element) {
	    var value = new Array();
	    for (var i = 0; i < element.length; i++) {
	      var opt = element.options[i];
	      if (opt.selected) {
	        var optValue = opt.value;
	        if (!optValue && !('value' in opt))
	          optValue = opt.text;
	        value.push(optValue);
	      }
	    }
	    return [element.name, value];
	  }
	}

	/*--------------------------------------------------------------------------*/

	var $F = Form.Element.getValue;

	/*--------------------------------------------------------------------------*/

	Abstract.TimedObserver = function() {}
	Abstract.TimedObserver.prototype = {
	  initialize: function(element, frequency, callback) {
	    this.frequency = frequency;
	    this.element   = $(element);
	    this.callback  = callback;

	    this.lastValue = this.getValue();
	    this.registerCallback();
	  },

	  registerCallback: function() {
	    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
	  },

	  onTimerEvent: function() {
	    var value = this.getValue();
	    if (this.lastValue != value) {
	      this.callback(this.element, value);
	      this.lastValue = value;
	    }
	  }
	}

	Form.Element.Observer = Class.create();
	Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
	  getValue: function() {
	    return Form.Element.getValue(this.element);
	  }
	});

	Form.Observer = Class.create();
	Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
	  getValue: function() {
	    return Form.serialize(this.element);
	  }
	});

	/*--------------------------------------------------------------------------*/

	Abstract.EventObserver = function() {}
	Abstract.EventObserver.prototype = {
	  initialize: function(element, callback) {
	    this.element  = $(element);
	    this.callback = callback;

	    this.lastValue = this.getValue();
	    if (this.element.tagName.toLowerCase() == 'form')
	      this.registerFormCallbacks();
	    else
	      this.registerCallback(this.element);
	  },

	  onElementEvent: function() {
	    var value = this.getValue();
	    if (this.lastValue != value) {
	      this.callback(this.element, value);
	      this.lastValue = value;
	    }
	  },

	  registerFormCallbacks: function() {
	    var elements = Form.getElements(this.element);
	    for (var i = 0; i < elements.length; i++)
	      this.registerCallback(elements[i]);
	  },

	  registerCallback: function(element) {
	    if (element.type) {
	      switch (element.type.toLowerCase()) {
	        case 'checkbox':
	        case 'radio':
	          Event.observe(element, 'click', this.onElementEvent.bind(this));
	          break;
	        case 'password':
	        case 'text':
	        case 'textarea':
	        case 'select-one':
	        case 'select-multiple':
	          Event.observe(element, 'change', this.onElementEvent.bind(this));
	          break;
	      }
	    }
	  }
	}

	Form.Element.EventObserver = Class.create();
	Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
	  getValue: function() {
	    return Form.Element.getValue(this.element);
	  }
	});

	Form.EventObserver = Class.create();
	Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
	  getValue: function() {
	    return Form.serialize(this.element);
	  }
	});
	if (!window.Event) {
	  var Event = new Object();
	}

	Object.extend(Event, {
	  KEY_BACKSPACE: 8,
	  KEY_TAB:       9,
	  KEY_RETURN:   13,
	  KEY_ESC:      27,
	  KEY_LEFT:     37,
	  KEY_UP:       38,
	  KEY_RIGHT:    39,
	  KEY_DOWN:     40,
	  KEY_DELETE:   46,

	  element: function(event) {
	    return event.target || event.srcElement;
	  },

	  isLeftClick: function(event) {
	    return (((event.which) && (event.which == 1)) ||
	            ((event.button) && (event.button == 1)));
	  },

	  pointerX: function(event) {
	    return event.pageX || (event.clientX +
	      (document.documentElement.scrollLeft || document.body.scrollLeft));
	  },

	  pointerY: function(event) {
	    return event.pageY || (event.clientY +
	      (document.documentElement.scrollTop || document.body.scrollTop));
	  },

	  stop: function(event) {
	    if (event.preventDefault) {
	      event.preventDefault();
	      event.stopPropagation();
	    } else {
	      event.returnValue = false;
	      event.cancelBubble = true;
	    }
	  },

	  // find the first node with the given tagName, starting from the
	  // node the event was triggered on; traverses the DOM upwards
	  findElement: function(event, tagName) {
	    var element = Event.element(event);
	    while (element.parentNode && (!element.tagName ||
	        (element.tagName.toUpperCase() != tagName.toUpperCase())))
	      element = element.parentNode;
	    return element;
	  },

	  observers: false,

	  _observeAndCache: function(element, name, observer, useCapture) {
	    if (!this.observers) this.observers = [];
	    if (element.addEventListener) {
	      this.observers.push([element, name, observer, useCapture]);
	      element.addEventListener(name, observer, useCapture);
	    } else if (element.attachEvent) {
	      this.observers.push([element, name, observer, useCapture]);
	      element.attachEvent('on' + name, observer);
	    }
	  },

	  unloadCache: function() {
	    if (!Event.observers) return;
	    for (var i = 0; i < Event.observers.length; i++) {
	      Event.stopObserving.apply(this, Event.observers[i]);
	      Event.observers[i][0] = null;
	    }
	    Event.observers = false;
	  },

	  observe: function(element, name, observer, useCapture) {
	    var element = $(element);
	    useCapture = useCapture || false;

	    if (name == 'keypress' &&
	        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
	        || element.attachEvent))
	      name = 'keydown';

	    this._observeAndCache(element, name, observer, useCapture);
	  },

	  stopObserving: function(element, name, observer, useCapture) {
	    var element = $(element);
	    useCapture = useCapture || false;

	    if (name == 'keypress' &&
	        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
	        || element.detachEvent))
	      name = 'keydown';

	    if (element.removeEventListener) {
	      element.removeEventListener(name, observer, useCapture);
	    } else if (element.detachEvent) {
	      element.detachEvent('on' + name, observer);
	    }
	  }
	});

	/* prevent memory leaks in IE */
	Event.observe(window, 'unload', Event.unloadCache, false);
	var Position = {
	  // set to true if needed, warning: firefox performance problems
	  // NOT neeeded for page scrolling, only if draggable contained in
	  // scrollable elements
	  includeScrollOffsets: false,

	  // must be called before calling withinIncludingScrolloffset, every time the
	  // page is scrolled
	  prepare: function() {
	    this.deltaX =  window.pageXOffset
	                || document.documentElement.scrollLeft
	                || document.body.scrollLeft
	                || 0;
	    this.deltaY =  window.pageYOffset
	                || document.documentElement.scrollTop
	                || document.body.scrollTop
	                || 0;
	  },

	  realOffset: function(element) {
	    var valueT = 0, valueL = 0;
	    do {
	      valueT += element.scrollTop  || 0;
	      valueL += element.scrollLeft || 0;
	      element = element.parentNode;
	    } while (element);
	    return [valueL, valueT];
	  },

	  cumulativeOffset: function(element) {
	    var valueT = 0, valueL = 0;
	    do {
	      valueT += element.offsetTop  || 0;
	      valueL += element.offsetLeft || 0;
	      element = element.offsetParent;
	    } while (element);
	    return [valueL, valueT];
	  },

	  positionedOffset: function(element) {
	    var valueT = 0, valueL = 0;
	    do {
	      valueT += element.offsetTop  || 0;
	      valueL += element.offsetLeft || 0;
	      element = element.offsetParent;
	      if (element) {
	        p = Element.getStyle(element, 'position');
	        if (p == 'relative' || p == 'absolute') break;
	      }
	    } while (element);
	    return [valueL, valueT];
	  },

	  offsetParent: function(element) {
	    if (element.offsetParent) return element.offsetParent;
	    if (element == document.body) return element;

	    while ((element = element.parentNode) && element != document.body)
	      if (Element.getStyle(element, 'position') != 'static')
	        return element;

	    return document.body;
	  },

	  // caches x/y coordinate pair to use with overlap
	  within: function(element, x, y) {
	    if (this.includeScrollOffsets)
	      return this.withinIncludingScrolloffsets(element, x, y);
	    this.xcomp = x;
	    this.ycomp = y;
	    this.offset = this.cumulativeOffset(element);

	    return (y >= this.offset[1] &&
	            y <  this.offset[1] + element.offsetHeight &&
	            x >= this.offset[0] &&
	            x <  this.offset[0] + element.offsetWidth);
	  },

	  withinIncludingScrolloffsets: function(element, x, y) {
	    var offsetcache = this.realOffset(element);

	    this.xcomp = x + offsetcache[0] - this.deltaX;
	    this.ycomp = y + offsetcache[1] - this.deltaY;
	    this.offset = this.cumulativeOffset(element);

	    return (this.ycomp >= this.offset[1] &&
	            this.ycomp <  this.offset[1] + element.offsetHeight &&
	            this.xcomp >= this.offset[0] &&
	            this.xcomp <  this.offset[0] + element.offsetWidth);
	  },

	  // within must be called directly before
	  overlap: function(mode, element) {
	    if (!mode) return 0;
	    if (mode == 'vertical')
	      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
	        element.offsetHeight;
	    if (mode == 'horizontal')
	      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
	        element.offsetWidth;
	  },

	  clone: function(source, target) {
	    source = $(source);
	    target = $(target);
	    target.style.position = 'absolute';
	    var offsets = this.cumulativeOffset(source);
	    target.style.top    = offsets[1] + 'px';
	    target.style.left   = offsets[0] + 'px';
	    target.style.width  = source.offsetWidth + 'px';
	    target.style.height = source.offsetHeight + 'px';
	  },

	  page: function(forElement) {
	    var valueT = 0, valueL = 0;

	    var element = forElement;
	    do {
	      valueT += element.offsetTop  || 0;
	      valueL += element.offsetLeft || 0;

	      // Safari fix
	      if (element.offsetParent==document.body)
	        if (Element.getStyle(element,'position')=='absolute') break;

	    } while (element = element.offsetParent);

	    element = forElement;
	    do {
	      valueT -= element.scrollTop  || 0;
	      valueL -= element.scrollLeft || 0;
	    } while (element = element.parentNode);

	    return [valueL, valueT];
	  },

	  clone: function(source, target) {
	    var options = Object.extend({
	      setLeft:    true,
	      setTop:     true,
	      setWidth:   true,
	      setHeight:  true,
	      offsetTop:  0,
	      offsetLeft: 0
	    }, arguments[2] || {})

	    // find page position of source
	    source = $(source);
	    var p = Position.page(source);

	    // find coordinate system to use
	    target = $(target);
	    var delta = [0, 0];
	    var parent = null;
	    // delta [0,0] will do fine with position: fixed elements,
	    // position:absolute needs offsetParent deltas
	    if (Element.getStyle(target,'position') == 'absolute') {
	      parent = Position.offsetParent(target);
	      delta = Position.page(parent);
	    }

	    // correct by body offsets (fixes Safari)
	    if (parent == document.body) {
	      delta[0] -= document.body.offsetLeft;
	      delta[1] -= document.body.offsetTop;
	    }

	    // set position
	    if(options.setLeft)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
	    if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
	    if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
	    if(options.setHeight) target.style.height = source.offsetHeight + 'px';
	  },

	  absolutize: function(element) {
	    element = $(element);
	    if (element.style.position == 'absolute') return;
	    Position.prepare();

	    var offsets = Position.positionedOffset(element);
	    var top     = offsets[1];
	    var left    = offsets[0];
	    var width   = element.clientWidth;
	    var height  = element.clientHeight;

	    element._originalLeft   = left - parseFloat(element.style.left  || 0);
	    element._originalTop    = top  - parseFloat(element.style.top || 0);
	    element._originalWidth  = element.style.width;
	    element._originalHeight = element.style.height;

	    element.style.position = 'absolute';
	    element.style.top    = top + 'px';;
	    element.style.left   = left + 'px';;
	    element.style.width  = width + 'px';;
	    element.style.height = height + 'px';;
	  },

	  relativize: function(element) {
	    element = $(element);
	    if (element.style.position == 'relative') return;
	    Position.prepare();

	    element.style.position = 'relative';
	    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
	    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

	    element.style.top    = top + 'px';
	    element.style.left   = left + 'px';
	    element.style.height = element._originalHeight;
	    element.style.width  = element._originalWidth;
	  }
	}

	// Safari returns margins on body which is incorrect if the child is absolutely
	// positioned.  For performance reasons, redefine Position.cumulativeOffset for
	// KHTML/WebKit only.
	if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
	  Position.cumulativeOffset = function(element) {
	    var valueT = 0, valueL = 0;
	    do {
	      valueT += element.offsetTop  || 0;
	      valueL += element.offsetLeft || 0;
	      if (element.offsetParent == document.body)
	        if (Element.getStyle(element, 'position') == 'absolute') break;

	      element = element.offsetParent;
	    } while (element);

	    return [valueL, valueT];
	  }
	}