var targetWin;
function PopupCenter(pageURL, title,w,h) {
var left = (screen.width/2)-(w/2);
var top = (screen.height/2)-(h/2);

targetWin = window.open (pageURL, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, dialog=yes,maximize=no,alwaystop=yes,minimizable=yes, width='+w+', height='+h+', top='+top+', left='+left);
}