function PopupCenter(PageURL,title,w,h) {
var left = (screen.width/2)-(w/2);
var top = (screen.height/2)-(h/2);
var targetWin = window.open (PageURL, title, 'toolbar=0, location=0, directories=0, status=0, navigation=0, menubar=0, scrollbars=0, resizable=0, copyhistory=0, width='+w+', height='+h+', top='+top+', left='+left);
}