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(/(\.[^.]+)$/, '_ro$1'); 
	} 
	function mouseout(e) { 
	  var target = findTarget(e); 
	  if (!target) return; 
	  var img_tag = target.childNodes[0]; 
	  img_tag.src = img_tag.src.replace(/_ro(\.[^.]+)$/, '$1'); 
	} 
	window.onload = setupRollovers;