var img_who_0 = new Image(); img_who_0.src = "/images/nav_who.gif";
			var img_who_1 = new Image(); img_who_1.src = "/images/nav_who_on.gif";		
			var img_what_0 = new Image(); img_what_0.src = "/images/nav_what.gif";
			var img_what_1 = new Image(); img_what_1.src = "/images/nav_what_on.gif";			
			var img_where_0 = new Image(); img_where_0.src = "/images/nav_where.gif";
			var img_where_1 = new Image(); img_where_1.src = "/images/nav_where_on.gif";			
			var img_why_0 = new Image(); img_why_0.src = "/images/nav_why.gif";
			var img_why_1 = new Image(); img_why_1.src = "/images/nav_why_on.gif";
						
			function iOn(img) {
				document.getElementById("nav_" + img).src = eval("img_" + img + "_1.src");
			}
			
			function iOff(img) {
				document.getElementById("nav_" + img).src = eval("img_" + img + "_0.src");
			}