function smartRollover() {
if(document.getElementsByTagName) {
var imgs = document.getElementsByTagName("img");
	for(var i=0; i < imgs.length; i++) {
		if(imgs[i].getAttribute("src").match("_off.")){
			imgs[i].onmouseover = function(){this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));}
			imgs[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);}