add:   event[ expando ] = true; 
context: 	fix: function(event) {		// store a copy of the original event object 		// and clone to set read-only properties		var originalEvent = event;		event = jQuery.extend({}, originalEvent);				// add preventDefault and stopPropagation since 		// they will not work on the clone		event.preventDefault = function() {			// if preventDefault exists run it on the original event			if (originalEvent.preventDefault)				originalEvent.preventDefault();			// otherwise set the returnValue property of the original event to false (IE)			originalEvent.returnValue = false;		};		event.stopPropagation = function() {			// if stopPropagation exists run it on the original event			if (originalEvent.stopPropagation)				originalEvent.stopPropagation();			// otherwise set the cancelBubble property of the original event to true (IE)			originalEvent.cancelBubble = true;		};				// Fix target property, if necessary		if ( !event.target )			event.target = event.srcElement || document; // Fixes #1925 where srcElement might not be defined either						// check if target is a textnode (safari)		if ( event.target.nodeType == 3 )			event.target = originalEvent.target.parentNode;		// Add relatedTarget, if necessary		if ( !event.relatedTarget && event.fromElement )			event.relatedTarget = event.fromElement == event.target ? event.toElement : event.fromElement;		// Calculate pageX/Y if missing and clientX/Y available		if ( event.pageX == null && event.clientX != null ) {			var doc = document.documentElement, body = document.body;			event.pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc.clientLeft || 0);			event.pageY = event.clientY + (doc && doc.scrollTop || body && body.scrollTop || 0) - (doc.clientTop || 0);		}					// Add which for key events		if ( !event.which && (event.charCode || event.keyCode) )			event.which = event.charCode || event.keyCode;				// Add metaKey to non-Mac browsers (use ctrl for PC's and Meta for Macs)		if ( !event.metaKey && event.ctrlKey )			event.metaKey = event.ctrlKey;		// Add which for click: 1 == left; 2 == middle; 3 == right		// Note: button is not normalized, so don't use it		if ( !event.which && event.button )			event.which = (event.button & 1 ? 1 : ( event.button & 2 ? 3 : ( event.button & 4 ? 2 : 0 ) ));					return event;	},
meta: 2798	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2798/a7dfbb55d9e4be6bbf096abb0e06e32086476a96/event.js/clean/src/event.js