//functions by LDB
var popup;
function openWindow(url) {

var windowleft=(screen.width-600)/2;
var windowtop=(screen.height-500)/2;
if (popup == null || popup.closed) {
 popup=window.open(url, "", "width=600,height=400,resizable=yes,location=yes,status=yes,scrollbars=yes,location=yes,left="+windowleft+",top="+windowtop+",screenx=10,screeny=10,toolbar=yes,menubar=yes,directories=yes");
}
else {
		// window's already open; bring to front
		popup.focus()
	}
}