function hilight(oelement){
	var sname = oelement.tagName;
	clearBG(sname);
	oelement.style.backgroundImage = 'url(img/gradient.gif)';
}
function clearBG(sname){
	var oitem = document.getElementsByTagName(sname);
	var ilen = oitem.length
	for (i=0;i<=ilen -1;i++){
			if (oitem[i].style.backgroundImage == 'url(img/gradient.gif)'){
				oitem[i].style.backgroundImage = 'none';
			}
	}
}