problem adding permissions to a page

[3clipse]

hi,
im working on a page within my vb directory which i need restricted access to. I added a field to "usergroups" table called "chainpermissions" and then made the following edits:

/admincp/usergroup.php

Find the following line:

	print_table_header($vbphrase['post_thread_permissions']);

	Add above:

	print_table_header("Chain Setup Permissions");
        print_yes_no_row("Can View Chain Setup? <dfn>Allows usergroup to view the Chain Setup</dfn>", 'usergroup[canviewchain]', $ug_bitfield['canviewchain']);
        print_table_break();

includes/init.php

Find the following lines:

	// ----------------------------------------------------------
	// ###  END PLUGIN USERGROUP PERMISSIONS BITFIELDS HERE   ###

	Add above:

	$_BITFIELD['usergroup']['chainpermissions'] = array(
        	'canviewchain'                   => 1
        );

includes/functions_online.php

* Find the following lines:

	case 'bugs':
        $userinfo['action'] = construct_phrase($vbphrase['viewing_x'], 'Bugs'); // Don't report 'bugs' as needing to be translated please :p
        break;

	Above add:

	case 'chain':
             $userinfo['action'] = 'Viewing Chain Setup';
             break;

	* Find following lines:

	default:
        $userinfo['activity'] = 'unknown';

	Add above:

	case 'chain.php':
              $userinfo['activity'] = 'chain';
              break;

/global.php

Find following lines:

        echo "End call of global.php:  $aftertime\n";
        echo "\n<hr />\n\n";
	}

	Add bellow:
	
	// Creates general settings for the Chain Setup
	$chainpermissions = convert_bits_to_array($permissions['chainpermissions'],$_BITFIELD['usergroup']['chainpermissions']);

and to the file i was working on "chain.php" i added the following to the end of the file just before the php code is closed.

if ($permissions['chainpermissions'] & CANVIEWCHAIN) {
    eval('print_output("' . fetch_template('Chain') . '");');
    exit;
    }

print_no_permission();

now theres no sql errors at all just anyone can still view that file and i cant work out what im doing wrong. :sleep: