function setupRollovers() 
{
	/*From DHTML Utopia by Sitepoint */
	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];
	//Take the "src", which names an image called "something.ext",
	// make it point to "something-over.ext" with a regular expression
	img_tag.src = img_tag.src.replace(/(\.[^.]+)$/, '-on$1');
}

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

// When the page loads, set up the rollovers
window.onload = setupRollovers;