function setEvent(id, event, url) {
	if(typeof document.getElementById == "undefined") return;
	var swapImg = new Image();
	swapImg.src = url;
	var obj = document.getElementById(id);
	if(typeof obj.attachEvent != "undefined"){
		obj.attachEvent("on"+event, function() {obj.src = swapImg.src});
	} else if(typeof obj.addEventListener != "undefined"){
		obj.addEventListener(event, function() {obj.src = url}, false);
	} else {
		obj["on"+event] = function() {obj.src = swapImg.src};
	}
}