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) {
		submenu_01_over = newImage("submenu/submenu_01-over.jpg");
		submenu_02_over = newImage("submenu/submenu_02-over.jpg");
		submenu_03_over = newImage("submenu/submenu_03-over.jpg");
		submenu_04_over = newImage("submenu/submenu_04-over.jpg");
		submenu_06_over = newImage("submenu/submenu_06-over.jpg");
		submenu_07_over = newImage("submenu/submenu_07-over.jpg");
		submenu_08_over = newImage("submenu/submenu_08-over.jpg");
		submenu_09_over = newImage("submenu/submenu_09-over.jpg");
		submenu_10_over = newImage("submenu/submenu_10-over.jpg");
		submenu_11_over = newImage("submenu/submenu_11-over.jpg");
		submenu_12_over = newImage("submenu/submenu_12-over.jpg");
		submenu_13_over = newImage("submenu/submenu_13-over.jpg");
		submenu_14_over = newImage("submenu/submenu_14-over.jpg");
		preloadFlag = true;
	}
}