teast<!DOCTYPE html>

<script>
  window.onbeforeunload = function(e) {
    var dialogText = 'Are you sure you want to close this Window?';
    e.returnValue = dialogText;
    return dialogText;
  };
</script>

<html>

<head>
  <title>EmptyPageCurrent</title>
</head>

<body bgcolor="#363636">
  <div style="text-align:center">
  .
  </div>
</body>

</html>