https://pncvets.com/js/chrisdomroll.js

1//=====================================================================
2//  DOM Image Rollover v3 (hover)
3//
4//  Demo: http://chrispoole.com/scripts/dom_image_rollover_hover
5//  Script featured on: Dynamic Drive (http://www.dynamicdrive.com)
6//=====================================================================
7//  copyright Chris Poole
8//  http://chrispoole.com
9//  This software is licensed under the MIT License 
10//  <http://opensource.org/licenses/mit-license.php>
11//=====================================================================
12
13function domRollover() {
14	if (navigator.userAgent.match(/Opera (\S+)/)) {
15		var operaVersion = parseInt(navigator.userAgent.match(/Opera (\S+)/)[1]);
16	}
17	if (!document.getElementById||operaVersion <7) return;
18	var imgarr=document.getElementsByTagName('img');
19	var imgPreload=new Array();
20	var imgSrc=new Array();
21	var imgClass=new Array();
22	for (i=0;i<imgarr.length;i++){
23		if (imgarr[i].className.indexOf('domroll')!=-1){
24			imgSrc[i]=imgarr[i].getAttribute('src');
25			imgClass[i]=imgarr[i].className;
26			imgPreload[i]=new Image();
27			if (imgClass[i].match(/domroll (\S+)/)) {
28				imgPreload[i].src = imgClass[i].match(/domroll (\S+)/)[1]
29			}
30			imgarr[i].setAttribute('xsrc', imgSrc[i]);
31			imgarr[i].onmouseover=function(){
32				this.setAttribute('src',this.className.match(/domroll (\S+)/)[1])
33			}
34			imgarr[i].onmouseout=function(){
35				this.setAttribute('src',this.getAttribute('xsrc'))
36			}
37		}
38	}
39}
40domRollover();