http://www.anet-yokyo.jp/js/rollover.js

1
2function setRollOver() {
3	var loadedImg = new Array();
4	if (!document.getElementsByTagName) return false;
5	var ovrImgList = document.getElementsByTagName('img');
6	for (var i = 0; i < ovrImgList.length; i++) {
7		if (ovrImgList[i].src.match(/_off\./i)) {
8			loadedImg[i] = new Image();
9			loadedImg[i].src = ovrImgList[i].src.replace(/_off\./i, '_over.');
10			ovrImgList[i].onmouseover = function() { 
11				this.src = this.src.replace(/_off\./i, '_over.');
12			}
13			ovrImgList[i].onmouseout = function() { 
14				this.src = this.src.replace(/_over\./i, '_off.');
15			}
16			if (navigator.userAgent.indexOf('MSIE') < 0) ovrImgList[i].onmouseup = function() {
17				this.src = this.src.replace(/_over\./i, '_off.');
18			}
19		}
20	}
21	return true;
22}
23if (window.addEventListener) window.addEventListener('load', setRollOver, false);
24if (window.attachEvent) window.attachEvent('onload', setRollOver);