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,scrollbar=auto,resizable=yes,copyhistory=no,width=650,height=500,left=0,top=0,screenX=0,screenY=0');
}