<?php
/*
Plugin Name: WP Meta Menu
Description: Overrides the current page menu with one selected from the custom page meta.
Version: 1.0
Author: Thomas Burton Sieverding

 Copyright 2010  Thomas Sieverding  (email : Jester831@gmail.com)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

function wp_meta_menu( $args ) {

    global $post;
    $menu = get_post_meta($post->ID, 'custom-menu', false);
    if(!empty($menu)) { $args['menu'] = $menu[0]; }
    return $args;
}

add_filter('wp_nav_menu_args', 'wp_meta_menu');
?>