function newImage(arg) {
 		var 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) {
		var about_on = newImage("/images/about_on.gif");
		var about_us_on = newImage("/images/about_us_on.gif");
		var buy_now_on = newImage("/images/buy_now_on.gif");
		var download_on = newImage("/images/download_on.gif");
		var home_on = newImage("/images/home_on.gif");
		var install_now_on = newImage("/images/install_now_on.gif");
		var learn_more_on = newImage("/images/learn_more_on.gif");
		var prod_on = newImage("/images/prod_on.gif");
		var products_on = newImage("/images/products_on.gif");
		var serve_on = newImage("/images/serve_on.gif");
		var services_on = newImage("/images/services_on.gif");
		var users_guide_on = newImage("/images/users_guide_on.gif");
		preloadFlag = true;
	}
}