function newImage(arg) {
		if (document.images) {
			rslt = new Image();
			rslt.src = arg;
			return rslt;
		}
	}
	
	function changeImages() {
		if (document.images && (preloadFlag == true)) {
			for (var i=0; i<changeImages.arguments.length; i+=2) {
				document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
			}
		}
	}
	
	var preloadFlag = false;
	function preloadImages() {
		if (document.images) {
			nav_home_over = newImage("images/nav_home-over.gif");
			nav_about_over = newImage("images/nav_about-over.gif");
			nav_install_over = newImage("images/nav_install-over.gif");
			nav_cs_over = newImage("images/nav_cs-over.gif");
			nav_specials_over = newImage("images/nav_specials-over.gif");
			nav_contact_over = newImage("images/nav_contact-over.gif");

			left_low_over = newImage("images/left_low-over.jpg");
			left_medium_over = newImage("images/left_medium-over.jpg");
			left_high_over = newImage("images/left_high-over.jpg");
			left_catalog_over = newImage("images/left_catalog-over.jpg");
			left_demos_over = newImage("images/left_demos-over.jpg");
			left_updates_over = newImage("images/left_updates-over.jpg");
			left_rfqs_over = newImage("images/left_rfqs-over.jpg");
			left_techinfo_over = newImage("images/left_techinfo-over.jpg");
			left_signage_over = newImage("images/left_signage-over.jpg");
			left_links_over = newImage("images/left_links-over.jpg");

			preloadFlag = true;
		}
	}