function navigationMouseOver(link){
	if(!link)
		return;
	var img = link.getElementsByTagName("img");
	img = img[0];
	if(!img)
		return;
	var split = img.src.split(".gif");
	var srcNew = split[0]+"-a.gif";
	img.src = srcNew;
}

function navigationMouseOut(link){
	if(!link)
		return;
	var img = link.getElementsByTagName("img");
	img = img[0];
	if(!img)
		return;
	var split = img.src.split("-a.gif");
	var srcNew = split[0]+".gif";
	img.src = srcNew;
}