function smartRollover() {
	if(document.getElementsByTagName) {
		var tags = ["img","input"];
		var len = tags.length;
		for( var i=0; i<len; i++ ) {
			var el = document.getElementsByTagName(tags[i]);
			var len2 = el.length;

			for(var j=0; j<len2; j++) {
				var attr = el[j].getAttribute("src");
				if( attr ) {
					if(el[j].getAttribute("src").match("_off."))
					{
						var imgObject = new Image();
						imgObject.src = (el[j].getAttribute("src").replace("_off.", "_on."));

						el[j].onmouseover = function() {
							this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));
						}
						el[j].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);
}