function smartRollover() {
if(document.getElementsByTagName) {
var images = document.getElementsByTagName("img");
for(var i=0; i < images.length; i++) {
if(images[i].getAttribute("src") && images[i].getAttribute("src").match("_off."))
{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);}