jericho.html
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.6.2.min.js"></script>
<script>
 $(document).ready(function() {
        var refreshId = setInterval(function() {
          $.ajax({
            src: 'jericho.jpg?' + Math.random(),
            ifModified: true,
            success: function(data) {
              $('.jericho').attr('src', 'jericho.jpg?' + Math.random());
            }
          });
        }, 1000);
        $.ajaxSetup({ cache: false });
  });
</script>
</head>
<body>
<img class="jericho" src="jericho.jpg" alt="Offline">
</pre>
</body>
</html>