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_03_over = newImage("images/menu_03-over.jpg");
		menu_05_over = newImage("images/menu_05-over.jpg");
		menu_07_over = newImage("images/menu_07-over.jpg");
		menu_09_over = newImage("images/menu_09-over.jpg");
		menu_11_over = newImage("images/menu_11-over.jpg");
		preloadFlag = true;
	}
}


function openWindow(url, name, width, height) {
	var myLeft = (screen.width  - width) / 2;
	var myTop  = (screen.height - height) / 2;
	window.open(url, name, "height="+height+",width="+width+",left="+myLeft+",top="+myTop+",scrollbars=yes,status=no,toolbar=no,menubar=no,location=no")
}
function openWindowNamed(url, name) {
	window.open(url, name, "scrollbars=yes,resizable=yes,status=no,toolbar=no,menubar=no,location=no")
}
function openImage(url, name, width, height) {
	var myLeft = (screen.width  - width) / 2;
	var myTop  = (screen.height - height) / 2;
	window.open(url, name, "height="+height+",width="+width+",left="+myLeft+",top="+myTop+",scrollbars=no,status=no,toolbar=no,menubar=no,location=no")
}