hide manage-tab in the admin area:

hi…the following post shows how to hide the manage-tab in the admin area.
first i have done it manually in the wp-admin/menu.php
this works fine, but i will understand what going on! can someone explain what “2” mean?

$menu[10] = array(__(‘Manage’), 2, ‘edit.php’);

and the plugin-idea, i can’t get it working!
<?php
/*
Plugin Name: Unmanage Posts
Description: Require manage_posts capability to manage posts
Author: Owen Winkler
Version: 1.0
Author URI: asymptomatic.net/
*/
add_action(‘admin_menu’, ‘my_admin_menu’);
add_filter(‘capabilities_list’, ‘my_caps_list’);
// Redefine some menu cap requirements:
function my_admin_menu() {
// Make the menu variables accessable here:
global $menu, $submenu;
$submenu[‘edit.php’][5] = array(__(‘Posts’), ‘manage_posts’, ‘edit.php’);
}
// Define a new capability for the Role Manager to use:
function my_caps_list($caps) {
$caps[] = ‘manage_posts’;
return $caps;
}
?>

what have i done wrong?

cheers!