function hoverMenu(el_id){
	var el = document.getElementById(el_id);
	
	if(el.className == 'underline')
		el.className="selUnderline";
	else
		el.className="underline";
}

function hoverProductMenu(el_id){
	var el = document.getElementById('product_'+el_id);
	
	if(el.className == '')
		el.className="sel";
	else
		el.className="";
}