function bbg_is_teacher( $user_id = false ) {
    global $current_user;

    if ( !$user_id )
        $user_id = $current_user->ID;

    if ( get_usermeta( $user_id, 'acct_type' ) == 'teacher' )
        return true;

    if ( is_super_admin() )
        return true;

    return false;
}