Web page rotation

<!-- Rotate web page code ! Not my code, just found on the Internet -->


<html>
<head>
  <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
  <script type="text/javascript" charset="utf-8">
    var sites = [
      "http://www.nanog.org",
      "http://www.firstdigest.com/",
      "http://www.cisco.com"
    ];
    var currentSite = sites.length;

    $(document).ready(function () {
      var $iframe = $("iframe").attr("src","http://www.google.com");
      setInterval(function() {
        (currentSite == 0) ? currentSite = sites.length - 1 : currentSite = currentSite -1;
        $iframe.attr("src",sites[currentSite]);
      }, 7000);
    });
  </script>
  <style type="text/css" media="screen">
    iframe {
      height: 100%;
      width: 100%;
      border: none;
    }
  </style>
</head>
<body>
  <iframe></iframe>
</body>
</html>