Created Module and Menu Items

Hi,

a couple of questions on module development which I can't get my head around...

I'm adding in a couple of administration features for my module, so I currently have the following items added...

function mymodule_menu() {
    
    $items = array();

    $items['admin/content/option1'] = array(
        'title' => 'Option 1',
        'description' => 'Description for option 1.',
        'page callback' => 'mymodule_option1',
        'access arguments' => array('administer mymodule'),
        'type' => MENU_NORMAL_ITEM,
    );
    $items['admin/content/option2'] = array(
        'title' => 'Option 2',
        'description' => "Description for option 2.",
        'page callback' => 'mymodule_option2',
        'access arguments' => array('administer mymodule'),
        'type' => MENU_NORMAL_ITEM,
    );

    return $items;
}

This of course makes the items appear under Content Management. What would I have to add to make them appear under their own menu grouping, i.e. Administration -> MyModule -> Option 1 and Administration -> MyModule -> Option 2.

Also as the owner of the site doesn't need any other admin functions I have removed all the permissions to such from their role, however the main menu groups within Administration still appear ( Site Building, Site Configuration, User Management and Help ). I tried the following to remove these items...

function mymodule_menu_alter(&$items) {

    global $user ;
    if ( $user->uid && in_array('owner', $user->roles ){
          unset( $items['admin/build'] );
          unset( $items['admin/settings'] );
          unset( $items['admin/user'] );
          unset( $items['admin/help'] );
    }    

}

but the menu options still appear when logging in as a test owner. I looked at Pro Dupal Development but the technique mentioned there didn't seem to work either. So what's the best way to remove menu items ?

Thanks,
Keith