case 'custom' :

    // Send 'em to the specified URL
    $redirect_to = $redirection["{$type}_url"];

    // Allow a few user specific variables
    $redirect_to = str_replace(
        array(
            '%user_id%',
            '%user_nicename%'
        ),
        array(
            $user->ID,
            $user->user_nicename
        ),
        $redirect_to
    );
    break;
}