function openWindow(windowURL){
	  window.name="mainWindow";
	  window.open(windowURL,"quizWindow","width=750,height=645,directories=no,toolbar=no,resizable=yes,menubar=no,scrollbars=yes");
	}
	function RefreshImage(valImageId) {
		var objImage = document.images[valImageId];
		if (objImage == undefined) {
			return;
		}
		var now = new Date();
		objImage.src = objImage.src.split('?')[0] + '?x=' + now.toUTCString();
	}