function openPopup(popupURL,ww,hh) {
  var w=window.open(popupURL,"popup","width="+ww+",height="+hh+",screenx="+(screen.width-ww)/2+",screeny="+(screen.height-hh)/2+",toolbar=no,resizable=no,scrollbars=no,left="+(screen.width-ww)/2+",top="+(screen.height-hh)/2);
  w.focus();
}