[Andreas]

PHP Code:

<?php
define('THIS_SCRIPT', 'external_articles');
define('NO_REGISTER_GLOBALS', 1);

$specialtemplates  = array();
$globaltemplates = array();
$actiontemplates = array();
$phrasegroups = array();

chdir('/path/to/forum');

require_once('./global.php');

$navbits = array();
$navbits = construct_navbits($array);

eval('print_output("' . fetch_template('navbar') . '");');
?>

... if this is what you want.
But keep in mind that navbar is not a complete HTML Document.