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;
    
  // The only child node of the a-tag in target will be an img-tag
  var img_tag = target.childNodes[0];
  
  img_tag.src = img_tag.src.replace(/(\.[^.]+)$/, '-ovr$1');  
}

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

window.onload = setupRollovers;