View file system/AJAX/interval/messages.php
<?php if (user('ID') > 0) { ?>
var messages = $('#messages').attr('action');
$('#messages').load(messages + " #messages");
<?php } ?>
<?php if (user('ID') > 0) { ?>
var messages = $('#messages').attr('action');
$('#messages').load(messages + " #messages");
<?php } ?>