first post seems this is the best place to get abit of help

anyway i am wanting to add a forum to my store.
so i have created a new page like http://xxx.com/forum.php looks like this
include(dirname(__FILE__)."/init.php");
$GLOBALS['ISC_CLASS_ORDER'] = GetClass('ISC_forum');
$GLOBALS['ISC_CLASS_ORDER']->HandlePage();
and added this to the init.php
),
"sitemap" => array(
"class" => "class.forum.php",
"name" => "ISC_FORUM",
"global" => "ISC_CLASS_FORUM"
i then made a class.forum.php in the includes/classes
looks like this (i think i am lost here now)
<?php
define('IN_PHPBB', true);
$phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './phpbb3/';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);
// Start session management
$user->session_begin();
$auth->acl($user->data);
$user->setup();
?>
now basically it gives an error
Fatal error: Cannot redeclare redirect() (previously declared in xxx\lib\general.php:3505) in xxx\phpBB3\includes\functions.php on line 2473
those lines are
3505: function redirect($url, $status = 303)
2473:
// Behave as per HTTP/1.1 spec for others
header('Location: ' . $url);
exit;
}
do you think this will work somehow or is there another better way to get a forum into my site..
at this point i don't mind duel log ins, the store will be email and the forum screen names.?
hope you can help

thanx,
Axel.