//=====================================================================  
 //  DOM Image Rollover v3 (hover)  
 //  
 //  Demo: http://chrispoole.com/scripts/dom_image_rollover_hover  
 //=====================================================================  
 //  copyright Chris Poole  
 //  http://chrispoole.com  
 //  This software is licensed under the MIT License   
 //  <http://opensource.org/licenses/mit-license.php>  
 //=====================================================================  
   
 function domRollover() {  
     if (navigator.userAgent.match(/Opera (\S+)/)) {  
         var operaVersion = parseInt(navigator.userAgent.match(/Opera (\S+)/)[1]);  
     }  
     if (!document.getElementById||operaVersion <7) return;  
   
     var imgarr=document.getElementsByTagName('img');  
     var imgPreload=new Array();  
     var imgSrc=new Array();  
     var imgClass=new Array();  
       
     for (i=0;i<imgarr.length;i++){  
         if (imgarr[i].className.indexOf('domroll')!=-1){  
             imgSrc[i]=imgarr[i].getAttribute('src');  
             imgClass[i]=imgarr[i].className;  
             imgPreload[i]=new Image();  
             if (imgClass[i].match(/domroll (\S+)/)) {  
                 imgPreload[i].src = imgClass[i].match(/domroll (\S+)/)[1]  
             }  
             imgarr[i].setAttribute('xsrc', imgSrc[i]);  
             imgarr[i].onmouseover=function(){  
                 this.setAttribute('src',this.className.match(/domroll (\S+)/)[1])  
             }  
             imgarr[i].onmouseout=function(){  
                 this.setAttribute('src',this.getAttribute('xsrc'))  
             }  
         }  
     }  
 }  
   
 window.onload = domRollover;