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_monitoring_over = newImage("images/nav_monitoring-over.gif");
		promo_metering_over = newImage("images/promo_metering-over.jpg");
		promo_logging_over = newImage("images/promo_logging-over.jpg");
		nav_howitworks_over = newImage("images/nav_howitworks-over.gif");
		promo_resources_over = newImage("images/promo_resources-over.jpg");
		promo_support_over = newImage("images/promo_support-over.jpg");
		nav_demo_over = newImage("images/nav_demo-over.gif");
		promo_demolink_over = newImage("images/promo_demolink-over.gif");
		nav_contact_over = newImage("images/nav_contact-over.gif");
		promo_preview_promo_resources_over = newImage("images/promo_preview-promo_resourc.jpg");
		promo_preview_promo_logging_over = newImage("images/promo_preview-promo_logging.jpg");
		promo_preview_promo_support_over = newImage("images/promo_preview-promo_support.jpg");
		preloadFlag = true;
	}
}