function smartRollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");
	    var preImages = new Array();

		for(var i=0; i < images.length; i++) {
			if(images[i].getAttribute("src").match("_off.")) {
				var preImage = new Image();
				preImage.src = images[i].getAttribute("src").replace("_off.", "_on.");
				preImages.push(preImage);
				images[i].onmouseover = function() {
				    this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));
				}
				images[i].onmouseout = function() {
				    this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));
				}
			}
		}
	}
}


/*
  ---------------------------------------------------------
  addLoadEvent
  ---------------------------------------------------------
*/
function addOnLoadEvent(func) {
	if (window.attachEvent){
		window.attachEvent('onload', func);
	}
	else {
		window.addEventListener('load', func, false);
	}
}
addOnLoadEvent(smartRollover);