var popupHandle;
	
	function closePopup() {
		if(popupHandle != null && !popupHandle.closed) popupHandle.close();
	}

	function displayPopup(url, height, width, scrollbar) {
		closePopup();
		properties = "toolbar=0,location=0,resizable=1,scrollbars=" + scrollbar;
		properties = properties + ",height=" + height;
		properties = properties + ",width=" + width;
		properties = properties + ",left=0,top=0";
		popupHandle = open(url, "newProperties", properties);
	}