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_top_sale_over = newImage("graphics/nav_top_sale_on.jpg");
		nav_top_bicycles_over = newImage("graphics/nav_top_bicycles_on.jpg");
		nav_top_parts_over = newImage("graphics/nav_top_parts_on.jpg");
		nav_top_accessories_over = newImage("graphics/nav_top_accessories_on.jpg");
		nav_top_clothing_over = newImage("graphics/nav_top_clothing_on.jpg");
		nav_top_service_over = newImage("graphics/nav_top_service_on.jpg");
		nav_bottom_about_over = newImage("graphics/nav_bottom_about_on.jpg");
		nav_bottom_ordering_over = newImage("graphics/nav_bottom_ordering_on.jpg");
		nav_bottom_hours_over = newImage("graphics/nav_bottom_hours_on.jpg");
		nav_bottom_blog_over = newImage("graphics/nav_bottom_blog_on.jpg");
		nav_bottom_gallery_over = newImage("graphics/nav_bottom_gallery_on.jpg");
		nav_bottom_brands_over = newImage("graphics/nav_bottom_brands_on.jpg");
		nav_bottom_signup_over = newImage("graphics/nav_bottom_signup_on.jpg");	
		
		preloadFlag = true;
	}
}