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) {
		button_01_over = newImage("media/button_01-over.gif");
		button_02_over = newImage("media/button_02-over.gif");
		button_03_over = newImage("media/button_03-over.gif");
		button_04_over = newImage("media/button_04-over.gif");
		button_05_over = newImage("media/button_05-over.gif");
		button_06_over = newImage("media/button_06-over.gif");
		button_07_over = newImage("media/button_07-over.gif");
		button_08_over = newImage("media/button_08-over.gif");
		button_09_over = newImage("media/button_09-over.gif");
		button_10_over = newImage("media/button_10-over.gif");
		button_11_over = newImage("media/button_11-over.gif");
		preloadFlag = true;
	}
}

function popupWindow(url, x, y) {
  window.open(url,'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width=' + x + ',height=' + y + ',screenX=150,screenY=150,top=150,left=150')
}