var popUpWin=0;
function popUpWindow(URLStr) {
  if(popUpWin) {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=yes,scrollbars=yes');
}