function setupRollovers() { 
 if (!document.getElementsByTagName) 
   return; 
 var all_links = document.getElementsByTagName('a'); 
 for (var i = 0; i < all_links.length; i++) { 
   var link = all_links[i]; 
   if (link.className && 
       (' ' + link.className + ' ').indexOf(' rollover ') != -1) 
   { 
     if (link.childNodes && 
         link.childNodes.length == 1 && 
         link.childNodes[0].nodeName.toLowerCase() == 'img') { 
       link.onmouseover = mouseover; 
       link.onmouseout = mouseout; 
     } 
   } 
 } 
} 


function findTarget(e) { 
 var target; 

 if (window.event && window.event.srcElement) 
   target = window.event.srcElement; 
 else if (e && e.target) 
   target = e.target; 
 if (!target) 
   return null; 

 while (target != document.body && 
     target.nodeName.toLowerCase() != 'a') 
   target = target.parentNode; 

 if (target.nodeName.toLowerCase() != 'a') 
   return null; 

 return target; 
} 


function mouseover(e) { 
 var target = findTarget(e); 
 if (!target) return; 

 var img_tag = target.childNodes[0]; 

 img_tag.src = img_tag.src.replace(/(\.[^.]+)$/, '_over$1'); 
} 


function mouseout(e) { 
 var target = findTarget(e); 
 if (!target) return; 

 var img_tag = target.childNodes[0]; 

 img_tag.src = img_tag.src.replace(/_over(\.[^.]+)$/, '$1'); 
} 


window.onload = setupRollovers;