Wordpress, get membership to display menu

I am using the wordpress plugin and need to display one menu if not logged in, and another menu if logged in. Below is what I have so far...not working:

/**Swap nav for member logged in */
session_start(); $user = $_SESSION['_amember_user']; if ($user['member_id'] > 0)
{
//Not a member logged in, use first menu
add_action( 'genesis_after_header', 'genesis_do_nav' );
remove_action( 'genesis_after_header', 'genesis_do_subnav' );
}
else
{
//Member, use second menu
remove_action( 'genesis_after_header', 'genesis_do_nav' );
add_action( 'genesis_after_header', 'genesis_do_subnav' );
}

I can't help you with code; however, I could suggest a possible solution.

You can do a lot with the WordPress Custom Menu by using the built-in aMember features and a plug-in.
Take a look at this video. I used aMember and one free plugin: Menu Items Visibility Control to do this.

http://www.screencast.com/t/qNAFZy4wLtL3