function rollover() { if(document.getElementsByTagName) { var images = document.getElementsByTagName("img");

for(var i=0; i < images.length; i++) {
if(images[i].getAttribute("src").match("_off."))
{images[i].onmouseover = function() {
this.setAttribute("src", this.getAttribute("src").replace("_off.", "_ov."));}
images[i].onmouseout = function() {this.setAttribute("src", this.getAttribute("src").replace("_ov.", "_off."));}}}
}
}

if(window.addEventListener) {window.addEventListener("load", rollover, false);}
else if(window.attachEvent) {window.attachEvent("onload", rollover);}