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\./))  
					{  
						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);  
}