/*firefox*/ 
function __firefox(){ 
    HTMLElement.prototype.__defineGetter__("runtimeStyle", __element_style); 
    window.constructor.prototype.__defineGetter__("event", __window_event); 
    Event.prototype.__defineGetter__("srcElement", __event_srcElement); 
} 
function __element_style(){ 
    return this.style; 
} 
function __window_event(){ 
    return __window_event_constructor(); 
} 
function __event_srcElement(){ 
    return this.target; 
} 
function __window_event_constructor(){ 
    if(document.all){ 
        return window.event; 
    } 
    var _caller = __window_event_constructor.caller; 
    while(_caller!=null){ 
        var _argument = _caller.arguments[0]; 
        if(_argument){ 
            var _temp = _argument.constructor; 
            if(_temp.toString().indexOf("Event")!=-1){ 
                return _argument; 
            } 
        } 
        _caller = _caller.caller; 
    } 
    return null; 
} 
if(window.addEventListener){ 
    __firefox(); 
} 
/*end firefox*/