var Utilities = {
	imgBase: "/images",
	attachEvent: 
		function (elt, evt, handler) {
			if (elt.addEventListener) elt.addEventListener(evt, handler, true);
			else if (elt.attachEvent) elt.attachEvent("on" + evt, handler);
		},
		
	setImgBase:
		function(base) {
			this.imgBase = base;
		},
	
	swapOver:
		function(e) {
			e = e || window.event;
			var target = e.target || e.srcElement;
			var img = document.getElementById(target.mainId);
			if (img) img.src = Utilities.imgBase + "/" + target.overUrl;
		}
}