javascript 阻止事件冒泡

function eventStopBubble() { 
	if ($.browser.mozilla){
		var ev ;
        var c = this.eventStopBubble.caller;
        while (c) {
            ev = c.arguments[0];
            if (ev && (Event == ev.constructor || MouseEvent  == ev.constructor)) {
                break;
            }
            c = c.caller;
        }		
        ev.stopPropagation();
	}else{
		if ( event && event.stopPropagation ) {
			 event.stopPropagation(); 
		}
		else {	   
			window.event.cancelBubble = true; 
		}
	}
}