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);