<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>