Limiting display to S2 member role

This post http://formidablepro.com/help-desk/can-custom-displays-show-only-the-forms-from-users-with-a-specific-role/

has this code:

add_filter('frm_where_filter', 'filter_custom_display', 10, 2);

function filter_custom_display($where, $args) {
    if($args['where_opt'] == 133) { // Change to the ID of your user ID field
        $user_ids = array();
        $lbl_users = get_users();
        foreach ($lbl_users as $lbl_user) {
            $lbl_userdata = get_userdata($lbl_user->ID);
            if (user_can($lbl_user->ID, 's2member_level1')) {
                $user_ids[] = $lbl_userdata->ID;
            }
        }
        $where = "meta_value in (". implode($user_ids, ',') .") and fi.id='". $args['where_opt'] ."'";
    }
    return $where;
}

How would I need to edit it if I wanted to include more than one level as in – s2member_level1 or s2member_level2?

Many thanks