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) {
		home_over = newImage("../navigation/nav_images/home-over.jpg");
		home_down = newImage("../navigation/nav_images/home-down.jpg");
		start_over = newImage("../navigation/nav_images/start-over.jpg");
		start_down = newImage("../navigation/nav_images/start-down.jpg");
		sites_over = newImage("../navigation/nav_images/sites-over.jpg");
		sites_down = newImage("../navigation/nav_images/sites-down.jpg");
		ideas_over = newImage("../navigation/nav_images/ideas-over.jpg");
		ideas_down = newImage("../navigation/nav_images/ideas-down.jpg");
		gallery_over = newImage("../navigation/nav_images/gallery-over.jpg");
		gallery_down = newImage("../navigation/nav_images/gallery-down.jpg");
		print_over = newImage("../navigation/nav_images/print-over.jpg");
		print_down = newImage("../navigation/nav_images/print-down.jpg");
		links1_over = newImage("../navigation/nav_images/links1-over.jpg");
		links1_down = newImage("../navigation/nav_images/links1-down.jpg");
		contact_over = newImage("../navigation/nav_images/contact-over.jpg");
		contact_down = newImage("../navigation/nav_images/contact-down.jpg");
		words_over = newImage("../navigation/nav_images/words-over.jpg");
		words_down = newImage("../navigation/nav_images/words-down.jpg");
		preloadFlag = true;
	}
}