var popUpWin=0;
var arrPopups = new Array();

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