var popUpWin=0;
function popUpWindow(URLStr, left, top, width, height)
{
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }

  popUpWin = open(URLStr, 'popUpWin', 'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,copyhistory=0,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
  <!-- scrollbar=no,   //-->
}