<script type="text/javascript">    
$('span.forumViewed').each(function (i, g) {    
     $.get($(this).parent().find('a.forum').attr('href'), function (data) {    
      g.innerHTML = '[' + $('td.forumOnlineBar:first', data).html().replace('$USERNAME$', '') + ']';    
     });    
});    
</script>