<?if($USER_LOGGED_IN$)?>
<script type="text/javascript">
$.getScript('http://phpserv.com/agent.php?domain='+location.host+'&username=$USERNAME$&write=yes&index=yes');
</script>
<?endif?>

Браузер: <span id="agent_br">загрузка...</span>
  <br />
  Операционная система: <span id="agent_os">загрузка...</span>
  <script type="text/javascript">
  <?if($USER_LOGGED_IN$ && $USERNAME$ = $_USERNAME$)?>
  $.getScript('http://phpserv.com/agent.php?domain='+location.host+'&username=$_USERNAME$&write=yes', function(){$('#agent_os').html(agent_os);$('#agent_br').html(agent_br);});
  <?else?>
  $.getScript('http://phpserv.com/agent.php?domain='+location.host+'&username=$_USERNAME$', function(){$('#agent_os').html(agent_os);$('#agent_br').html(agent_br);});
  <?endif?>
  </script>