Clones an event object. You can optionally pass new initialization values to override the ones from the cloned event object.

cloneEventObj.js

function cloneEventObj(eventObj, overrides){
	var p, eventInit = {}, clone;
	overrides = overrides || {};
	
	for(p in eventObj){
		eventInit[p] = eventObj[p];
	}
	for(p in overrides){
		eventInit[p] = overrides[p];
	}
	
	clone = new eventObj.constructor(eventObj.type, eventInit);
	
	//make sure any custom properties get copied to the new event object
	for(p in eventInit){
		try{
			clone[p] = eventInit[p];
		}
		catch(e){}
	}
}