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_menu_over = newImage("images/home_menu-over.jpg");
		contact_menu_over = newImage("images/contact_menu-over.jpg");
		search_menu_over = newImage("images/search_menu-over.jpg");
		main_menu_CD_over = newImage("images/main_menu_CD_over.jpg");
		main_menu_IC_over = newImage("images/main_menu_IC_over.jpg");
		main_menu_PO_over = newImage("images/main_menu_PO_over.jpg");
		main_menu_CE_over = newImage("images/main_menu_CE_over.jpg");
		main_menu_CO_over = newImage("images/main_menu_CO_over.jpg");
		preloadFlag = true;
	}
}