(function() {



function rolloverImage() {

	if (!document.getElementsByTagName) return false;

	var img = document.getElementsByTagName('img');

	for (var i = 0, l = img.length; i < l; i++) {

		if (img[i].getAttribute('src').match(/_off\./)) {

			img[i].off = img[i].getAttribute('src');

			img[i].ext = img[i].off.substring(img[i].off.lastIndexOf('.'), img[i].off.length);

			img[i].on = img[i].off.replace('_off' + img[i].ext, '_on' + img[i].ext);



			var preload = new Array();

			preload[i] = new Image();

			preload[i].setAttribute('src', img[i].on);



			img[i].onmouseover = function() {

				this.setAttribute('src', this.on);

			}



			img[i].onmouseout = function() {

				this.setAttribute('src', this.off);

			}

		}

	}

}



function addEvent(elm, listener, fn) {

	try {

		elm.addEventListener(listener, fn, false);

	}

	catch(e) {

		elm.attachEvent('on' + listener, fn);

	}

}



addEvent(window, 'load', rolloverImage);



})();