/*  Prototype JavaScript framework, version 1.5.0_rc0
 *  (c) 2005 Sam Stephenson <sam@conio.net>
 *
 *  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: '1.5.0_rc0',
  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 (var 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;
	      }
	    }
	  }
	}
	Object.extend(String.prototype, {
	  gsub: function(pattern, replacement) {
	    var result = '', source = this, match;
	    replacement = arguments.callee.prepareReplacement(replacement);
	
	    while (source.length > 0) {
	      if (match = source.match(pattern)) {
	        result += source.slice(0, match.index);
	        result += (replacement(match) || '').toString();
	        source  = source.slice(match.index + match[0].length);
	      } else {
	        result += source, source = '';
	      }
	    }
	    return result;
	  },
	
	  sub: function(pattern, replacement, count) {
	    replacement = this.gsub.prepareReplacement(replacement);
	    count = count === undefined ? 1 : count;
	
	    return this.gsub(pattern, function(match) {
	      if (--count < 0) return match[0];
	      return replacement(match);
	    });
	  },
	
	  scan: function(pattern, iterator) {
	    this.gsub(pattern, iterator);
	    return this;
	  },
	
	  truncate: function(length, truncation) {
	    length = length || 30;
	    truncation = truncation === undefined ? '...' : truncation;
	    return this.length > length ?
	      this.slice(0, length - truncation.length) + truncation : this;
	  },
	
	  strip: function() {
	    return this.replace(/^\s+/, '').replace(/\s+$/, '');
	  },
	
	  stripTags: function() {
	    return this.replace(/<\/?[^>]+>/gi, '');
	  },
	
	  stripScripts: function() {
	    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
	  },
	
	  extractScripts: function() {
	    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
	    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
	    return (this.match(matchAll) || []).map(function(scriptTag) {
	      return (scriptTag.match(matchOne) || ['', ''])[1];
	    });
	  },
	
	  evalScripts: function() {
	    return this.extractScripts().map(function(script) { return eval(script) });
	  },
	
	  escapeHTML: function() {
	    var 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(/\\/g, '\\\\').replace(/'/g, '\\\'') + "'";
	  }
	});
	
	String.prototype.gsub.prepareReplacement = function(replacement) {
	  if (typeof replacement == 'function') return replacement;
	  var template = new Template(replacement);
	  return function(match) { return template.evaluate(match) };
	}
	
	String.prototype.parseQuery = String.prototype.toQueryParams;
	
	var Template = Class.create();
	Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
	Template.prototype = {
	  initialize: function(template, pattern) {
	    this.template = template.toString();
	    this.pattern  = pattern || Template.Pattern;
	  },
	
	  evaluate: function(object) {
	    return this.template.gsub(this.pattern, function(match) {
	      var before = match[1];
	      if (before == '\\') return match[2];
	      return before + (object[match[3]] || '').toString();
	    });
	  }
	}
	
	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 (result == undefined || value >= result)
	        result = value;
	    });
	    return result;
	  },
	
	  min: function(iterator) {
	    var result;
	    this.each(function(value, index) {
	      value = (iterator || Prototype.K)(value, index);
	      if (result == undefined || value < result)
	        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) {
	      return iterator(collections.pluck(index));
	    });
	  },
	
	  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);
	
	if (!Array.prototype._reverse)
	  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 && 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();
	  },
	
	  inspect: function() {
	    return '[' + this.map(Object.inspect).join(', ') + ']';
	  }
	});
	var Hash = {
	  _each: function(iterator) {
	    for (var 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 XMLHttpRequest()},
	      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
	      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
	    ) || false;
	  },
	
	  activeRequestCount: 0
	}
	
	Ajax.Responders = {
	  responders: [],
	
	  _each: function(iterator) {
	    this.responders._each(iterator);
	  },
	
	  register: function(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,
	      contentType:  'application/x-www-form-urlencoded',
	      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,
	       'Accept', 'text/javascript, text/html, application/xml, text/xml, */*'];
	
	    if (this.options.method == 'post') {
	      requestHeaders.push('Content-type', this.options.contentType);
	
	      /* 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);
	  }
	});
	function $() {
	  var results = [], element;
	  for (var i = 0; i < arguments.length; i++) {
	    element = arguments[i];
	    if (typeof element == 'string')
	      element = document.getElementById(element);
	    results.push(Element.extend(element));
	  }
	  return results.length < 2 ? results[0] : results;
	}
	
	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(Element.extend(child));
	    return elements;
	  });
	}
	
	/*--------------------------------------------------------------------------*/
	
	if (!window.Element)
	  var Element = new Object();
	
	Element.extend = function(element) {
	  if (!element) return;
	  if (_nativeExtensions) return element;
	
	  if (!element._extended && element.tagName && element != window) {
	    var methods = Element.Methods, cache = Element.extend.cache;
	    for (property in methods) {
	      var value = methods[property];
	      if (typeof value == 'function')
	        element[property] = cache.findOrStore(value);
	    }
	  }
	
	  element._extended = true;
	  return element;
	}
	
	Element.extend.cache = {
	  findOrStore: function(value) {
	    return this[value] = this[value] || function() {
	      return value.apply(null, [this].concat($A(arguments)));
	    }
	  }
	}
	
	Element.Methods = {
	  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);
	  },
	
	  replace: function(element, html) {
	    element = $(element);
	    if (element.outerHTML) {
	      element.outerHTML = html.stripScripts();
	    } else {
	      var range = element.ownerDocument.createRange();
	      range.selectNodeContents(element);
	      element.parentNode.replaceChild(
	        range.createContextualFragment(html.stripScripts()), element);
	    }
	    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 $(element).innerHTML.match(/^\s*$/);
 	  },
 	
 	  childOf: function(element, ancestor) {
 	    element = $(element), ancestor = $(ancestor);
 	    while (element = element.parentNode)
 	      if (element == ancestor) return true;
 	    return false;
 	  },
 	
 	  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 (var 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;
 	  }
 	}
 	
 	Object.extend(Element, Element.Methods);
 	
 	var _nativeExtensions = false;
 	
 	if(!HTMLElement && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
 	  var HTMLElement = {}
 	  HTMLElement.prototype = document.createElement('div').__proto__;
 	}
 	
 	Element.addMethods = function(methods) {
 	  Object.extend(Element.Methods, methods || {});
 	
 	  if(typeof HTMLElement != 'undefined') {
 	    var methods = Element.Methods, cache = Element.extend.cache;
 	    for (property in methods) {
 	      var value = methods[property];
 	      if (typeof value == 'function')
 	        HTMLElement.prototype[property] = cache.findOrStore(value);
 	    }
 	    _nativeExtensions = true;
 	  }
 	}
 	
 	Element.addMethods();
 	
 	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) {
 	        var tagName = this.element.tagName.toLowerCase();
 	        if (tagName == 'tbody' || tagName == 'tr') {
 	          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 Selector = Class.create();
 	Selector.prototype = {
 	  initialize: function(expression) {
 	    this.params = {classNames: []};
 	    this.expression = expression.toString().strip();
 	    this.parseExpression();
 	    this.compileMatcher();
 	  },
 	
 	  parseExpression: function() {
 	    function abort(message) { throw 'Parse error in selector: ' + message; }
 	
 	    if (this.expression == '')  abort('empty expression');
 	
 	    var params = this.params, expr = this.expression, match, modifier, clause, rest;
 	    while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {
 	      params.attributes = params.attributes || [];
 	      params.attributes.push({name: match[2], operator: match[3], value: match[4] || match[5] || ''});
 	      expr = match[1];
 	    }
 	
 	    if (expr == '*') return this.params.wildcard = true;
 	
 	    while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {
 	      modifier = match[1], clause = match[2], rest = match[3];
 	      switch (modifier) {
 	        case '#':       params.id = clause; break;
 	        case '.':       params.classNames.push(clause); break;
 	        case '':
 	        case undefined: params.tagName = clause.toUpperCase(); break;
 	        default:        abort(expr.inspect());
 	      }
 	      expr = rest;
 	    }
 	
 	    if (expr.length > 0) abort(expr.inspect());
 	  },
 	
 	  buildMatchExpression: function() {
 	    var params = this.params, conditions = [], clause;
 	
 	    if (params.wildcard)
 	      conditions.push('true');
 	    if (clause = params.id)
 	      conditions.push('element.id == ' + clause.inspect());
 	    if (clause = params.tagName)
 	      conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());
 	    if ((clause = params.classNames).length > 0)
 	      for (var i = 0; i < clause.length; i++)
 	        conditions.push('Element.hasClassName(element, ' + clause[i].inspect() + ')');
 	    if (clause = params.attributes) {
 	      clause.each(function(attribute) {
 	        var value = 'element.getAttribute(' + attribute.name.inspect() + ')';
 	        var splitValueBy = function(delimiter) {
 	          return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';
 	        }
 	
 	        switch (attribute.operator) {
 	          case '=':       conditions.push(value + ' == ' + attribute.value.inspect()); break;
 	          case '~=':      conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;
 	          case '|=':      conditions.push(
 	                            splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()
 	                          ); break;
 	          case '!=':      conditions.push(value + ' != ' + attribute.value.inspect()); break;
 	          case '':
 	          case undefined: conditions.push(value + ' != null'); break;
 	          default:        throw 'Unknown operator ' + attribute.operator + ' in selector';
 	        }
 	      });
 	    }
 	
 	    return conditions.join(' && ');
 	  },
 	
 	  compileMatcher: function() {
 	    this.match = new Function('element', 'if (!element.tagName) return false; \
 	      return ' + this.buildMatchExpression());
 	  },
 	
 	  findElements: function(scope) {
 	    var element;
 	
 	    if (element = $(this.params.id))
 	      if (this.match(element))
 	        if (!scope || Element.childOf(element, scope))
 	          return [element];
 	
 	    scope = (scope || document).getElementsByTagName(this.params.tagName || '*');
 	
 	    var results = [];
 	    for (var i = 0; i < scope.length; i++)
 	      if (this.match(element = scope[i]))
 	        results.push(Element.extend(element));
 	
 	    return results;
 	  },
 	
 	  toString: function() {
 	    return this.expression;
 	  }
 	}
 	
 	function $$() {
 	  return $A(arguments).map(function(expression) {
 	    return expression.strip().split(/\s+/).inject([null], function(results, expr) {
 	      var selector = new Selector(expr);
 	      return results.map(selector.findElements.bind(selector)).flatten();
 	    });
 	  }).flatten();
 	}
 	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 (var 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 || opt.text;
 	    }
 	    return [element.name, value];
 	  },
 	
 	  selectMany: function(element) {
 	    var value = [];
 	    for (var i = 0; i < element.length; i++) {
 	      var opt = element.options[i];
 	      if (opt.selected)
 	        value.push(opt.value || opt.text);
 	    }
 	    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 */
 	if (navigator.appVersion.match(/\bMSIE\b/))
 	  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];
 	  }
 	}