var popUpWin=0;
function popUpWindow(URLStr, windowName, left, top, width, height, scrollbar)
{
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, windowName, 'toolbar=0,location=0,directories=0,status=0,menub ar=0,scrollbars='+scrollbar+',resizable=0,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}