function run()
{
    global $user;
    global $layout;
    global $DB;
    $out = '';
    $item = new profile();
    switch ($_REQUEST['act']) {
        case 'json':
        case 1:
            // json data retrieval & operations
            switch ($_REQUEST['oper']) {
                case 'del':
                    // remove rows
                    $ids = $_REQUEST['ids'];
                    foreach ($ids as $id) {
                        $item->load($id);
                        $item->delete();
                    }
                    echo json_encode(true);
                    break;
                default:
                    // list or search
                    $page = intval($_REQUEST['page']);
                    $max = intval($_REQUEST['rows']);
                    $offset = ($page - 1) * $max;
                    $orderby = $_REQUEST['sidx'] . ' ' . $_REQUEST['sord'];
                    $where = " 1=1 ";
                    if ($_REQUEST['_search'] == 'true' || isset($_REQUEST['quicksearch'])) {
                        if (isset($_REQUEST['quicksearch'])) {
                            $where .= $item->quicksearch($_REQUEST['quicksearch']);
                        } else {
                            if (isset($_REQUEST['filters'])) {
                                $where .= navitable::jqgridsearch($_REQUEST['filters']);
                            } else {
                                // single search
                                $where .= ' AND ' . navitable::jqgridcompare($_REQUEST['searchField'], $_REQUEST['searchOper'], $_REQUEST['searchString']);
                            }
                        }
                    }
                    $DB->queryLimit('id,name', 'nv_profiles', $where, $orderby, $offset, $max);
                    $dataset = $DB->result();
                    $total = $DB->foundRows();
                    //echo $DB->get_last_error();
                    $out = array();
                    for ($i = 0; $i < count($dataset); $i++) {
                        $out[$i] = array(0 => $dataset[$i]['id'], 1 => $dataset[$i]['name']);
                    }
                    navitable::jqgridJson($out, $page, $offset, $max, $total);
                    break;
            }
            session_write_close();
            exit;
            break;
        case 'edit':
        case 2:
            // edit/new form
            if (!empty($_REQUEST['id'])) {
                $item->load(intval($_REQUEST['id']));
            }
            if (isset($_REQUEST['form-sent'])) {
                $item->load_from_post();
                try {
                    $item->save();
                    permission::update_permissions(json_decode($_REQUEST['navigate_permissions_changes'], true), $item->id, 0);
                    $layout->navigate_notification(t(53, "Data saved successfully."), false, false, 'fa fa-check');
                } catch (Exception $e) {
                    $layout->navigate_notification($e->getMessage(), true, true);
                }
            }
            $out = profiles_form($item);
            break;
        case 'delete':
        case 4:
            // remove
            if (!empty($_REQUEST['id'])) {
                $item->load(intval($_REQUEST['id']));
                if ($item->delete() > 0) {
                    $layout->navigate_notification(t(55, 'Item removed successfully.'), false);
                    $out = profiles_list();
                } else {
                    $layout->navigate_notification(t(56, 'Unexpected error.'), false);
                    $out = profiles_form($item);
                }
            }
            break;
        case 'list':
        case 0:
            // list / search result
        // list / search result
        default:
            $out = profiles_list();
            break;
    }
    return $out;
}