function preloadTopNav() {
		preload1 = new Image(98, 18); preload1.src = "/images/top_nav_home_on.gif";
		preload2 = new Image(99, 18); preload1.src = "/images/top_nav_sitemap_on.gif";
		preload3 = new Image(90, 18); preload1.src = "/images/top_nav_catalogue_on.gif";		
		preload4 = new Image(112, 18); preload1.src ="/images/top_nav_youracct_on.gif";				
		preload5 = new Image(98, 18); preload1.src = "/WebSite/images/top_nav_databases_on.gif";	
		preload6 = new Image(159, 18); preload1.src ="/WebSite/images/top_nav_vrl_on.gif";				

	}