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

		for(var i=0; i<images.length; i++){
			if(images[i].getAttribute("src").match("_ro1.")){
				images[i].onmouseover = function(){
					this.setAttribute("src", this.getAttribute("src").replace("_ro1.", "_ro2."));
				}
				images[i].onmouseout = function(){
					this.setAttribute("src", this.getAttribute("src").replace("_ro2.", "_ro1."));
				}
			}
		}
	}
}

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