function hidelayer(x){
			//document.getElementById(x).style.visibility = "hidden";
			document.getElementById(x).style.display = "none";
		}

		function setviews(y){
			hidelayer('spec');
			hidelayer('desc');
			hidelayer('reso');
			hidelayer('othe');

			//images
			document.images["img_spec"].src="../images/spec_cold_"+y+".gif";

			document.images["img_desc"].src="../images/desc_cold_"+y+".gif";

			document.images["img_reso"].src="../images/reso_cold_"+y+".gif";

			document.images["img_othe"].src="../images/othe_cold_"+y+".gif";
		}

		function dis_selected(x,y){
			setviews(y);
			document.images["img_" + x].src="../images/"+ x + "_hot_"+y+".gif";
			document.getElementById(x).style.display = "";
		}