d = document;


// rollover
function onMouse() {
	if (!d.getElementById) return;
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = d.getElementsByTagName("img");

	for (var i = 0; i < aImages.length; i++) {		
		if (aImages[i].className == "r") {
			var src = aImages[i].getAttribute("src");
			var ftype = src.substring(src.lastIndexOf("."), src.length);
			var hsrc = src.replace(ftype, "_o"+ftype);

			aImages[i].setAttribute("hsrc", hsrc);
			
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;
			
			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute("src");
				this.setAttribute("src", this.getAttribute("hsrc"));
			}	
			
			aImages[i].onmouseout = function() {
				if (!sTempSrc) sTempSrc = this.getAttribute("src").replace("_o"+ftype, ftype);
				this.setAttribute("src", sTempSrc);
			}
		}
	}
}



// onload Event

window.onload = function(){
	onMouse();
}