var popUpWin=0;
function popUpWindow(URLStr, width, height)
{
	var left = Math.round(screen.width/2 - width/2);
	var top =  Math.round(screen.height/2 - height/2);
	width += 20;
	height += 20;
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}