function rollOverImg(aElement) {
	var imgElements = aElement.getElementsByTagName("IMG");
	var src = imgElements[0].src;
	var pos = src.lastIndexOf(".");
	var file = src.slice(0,pos);
	var ext = src.slice(pos);
	var newSrc = file.concat("-over", ext);
	newSrc = newSrc.replace("-over-over", "-over");
	if(file.indexOf("-active") < 0) imgElements[0].src = newSrc;
}
function rollOutImg(aElement) {
	var imgElements = aElement.getElementsByTagName("IMG");
	var src = imgElements[0].src;
	var newSrc = src.replace("-over", "");
	if(src.indexOf("-active") < 0) imgElements[0].src = newSrc;
}