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,menub ar=no,scrollbars=1,resizable=no,copyhistory=yes,width=800,height=675');
}