var newWin = null
  function openWindow(url, winTitle, w, h) {
    var options = "width=" + w + ",height=" + h + ",";
    options += "resizable=yes,scrollbars=yes,status=yes,";
    options += "menubar=no,toolbar=no,location=no,directories=no";
    newWin = window.open(url, winTitle, options);
    newWin.focus();
  }
  function closeWin(){ 
    if(newWin != null) if(!newWin.closed) newWin.close()
  }