function smartRollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");
		for(var i=0; i < images.length; i++) {
			if(images[i].className == "imgover") {
				images[i].onmouseover = function() {
					this.setAttribute("src", this.getAttribute("src").replace(".gif", "_ov.gif"));
					this.setAttribute("src", this.getAttribute("src").replace(".jpg", "_ov.jpg"));
					this.setAttribute("src", this.getAttribute("src").replace(".png", "_ov.png"));
				}
				images[i].onmouseout = function() {
					this.setAttribute("src", this.getAttribute("src").replace("_ov.gif", ".gif"));
					this.setAttribute("src", this.getAttribute("src").replace("_ov.jpg", ".jpg"));
					this.setAttribute("src", this.getAttribute("src").replace("_ov.png", ".png"));
				}
			}
		}
	}
}
if(window.addEventListener) {
	window.addEventListener("load", smartRollover, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", smartRollover);
}