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 aTag in target will be an img-tag
	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;