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) {
		menu_01_over = newImage("images/menu_01-over.jpg");
		menu_02_menu_01_over = newImage("images/menu_02-menu_01_over.jpg");
		menu_03_menu_01_over = newImage("images/menu_03-menu_01_over.jpg");
		menu_04_menu_01_over = newImage("images/menu_04-menu_01_over.jpg");
		menu_05_menu_01_over = newImage("images/menu_05-menu_01_over.jpg");
		menu_06_menu_01_over = newImage("images/menu_06-menu_01_over.jpg");
		menu_07_menu_01_over = newImage("images/menu_07-menu_01_over.jpg");
		menu_08_menu_01_over = newImage("images/menu_08-menu_01_over.jpg");
		preloadFlag = true;
	}
}