Pnphpbb2 group permissions

Hello,

I am trying to make a PHP page for postnuke, that I want only to be accessible by certain usergroups that are set up in pnphpbb2. How do I go about doing this?
Something like...

Code

<?php
// Begin PNphpBB2 Module
if (!defined("LOADED_AS_MODULE")) {
     die ("You can't access this file directly...");
}
global $pnconfig;
$pntable = pnDBGetTables();
$ModName = basename( dirname( __file__ ) );
// End PNphpBB2 Module

define('IN_PHPBB', true);
// Begin PNphpBB2 Module
$phpbb_root_path = './modules/' . $ModName . '/';
// End PNphpBB2 Module
include($phpbb_root_path . 'extension.inc');
include($phpbb_root_path . 'common.'.$phpEx);

// Start session management
//
$userdata = session_pagestart($user_ip, PAGE_VIEWMEMBERS);
init_userprefs($userdata);
//
// End session management
//

if ($userdata['session_logged_in'])
{

/* Your PHP Content here
echo "Hello World";
*/

}

?>


Didnt have the time to test it, off to work now!