function smartRollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");
		var preImages = new Array();
		for(var i=0; i < images.length; i++) {
			if(images[i].getAttribute("src").match("-off.")) {
				var preImage = new Image();
				preImage.src =
				images[i].getAttribute("src").replace("-off.", "-on.");
				preImages.push(preImage);
				images[i].onmouseover = function() {
					this.setAttribute("src",
					this.getAttribute("src").replace("-off.", "-on."));
				}
				images[i].onmouseout = function() {
					this.setAttribute("src",
					this.getAttribute("src").replace("-on.", "-off."));
				}
			}
		}
	}
}
if(window.addEventListener) {
	window.addEventListener("load", smartRollover, false);
} else if(window.attachEvent) {
	window.attachEvent("onload", smartRollover);
}