// swap images for navigation bar
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("images/buttons/home_over.jpg");
		aboutus_over = newImage("images/buttons/aboutus_over.jpg");
		services_over = newImage("images/buttons/services_over.jpg");
		pricelist_over = newImage("images/buttons/pricelist_over.jpg");
		products_over = newImage("images/buttons/products_over.jpg");
		contact_map_over = newImage("images/buttons/contact_map_over.jpg");
		faq_over = newImage("images/buttons/faq_over.jpg");
		
		preloadFlag = true;
	}
}