<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="pl">

<head>
  <title>Test page</title>
  <script type="text/javascript">
    function Session()
    {
      var oIframe = document.createElement('iframe');
      oIframe.src = 'ping.php'; oIframe.style.border = oIframe.style.width = oIframe.style.height = 0;
      document.body.appendChild(oIframe);
    }
    
    setTimeout("Session()", 180000);
  </script>
</head>

<body>

<div id="construct">
  <p>
    To jest strona HTML.
  </p>
</div>

</body>
</html>