/**
     * Edit group permission (use Ajax)
     *
     * @param   integer	$id_group Group ID
     * @return  void
     */
    public function gperm($id_group)
    {
        // load dictionaries
        $this->dict->get_wordarray(array('form', 'groups'));
        // get objects (group permissions)
        $mod = new Permission_model();
        $gp = X4Utils_helper::obj2array($mod->get_gprivs($id_group), 'what', 'level');
        // get area data
        $g = $mod->get_by_id($id_group, 'groups', 'id_area');
        $a = $mod->get_by_id($g->id_area, 'areas', 'private');
        // build the form
        $fields = array();
        $fields[] = array('label' => null, 'type' => 'hidden', 'value' => $id_group, 'name' => 'id');
        $fields[] = array('label' => null, 'type' => 'hidden', 'value' => $a->private, 'name' => 'xrif');
        // available permission levels
        $l = $mod->get_levels();
        $fields[] = array('label' => null, 'type' => 'html', 'value' => '<div class="band inner-pad clearfix">');
        // registered group permissions
        $types = $mod->get_privtypes($a->private);
        foreach ($types as $i) {
            $fields[] = array('label' => null, 'type' => 'html', 'value' => '<div class="one-half xs-one-whole">');
            // actual permission level
            $value = isset($gp[$i->name]) ? $gp[$i->name] : 0;
            $fields[] = array('label' => constant($i->description), 'type' => 'select', 'value' => $value, 'name' => $i->name, 'options' => array($l, 'id', 'name', 0), 'extra' => 'class="large"');
            $fields[] = array('label' => null, 'type' => 'hidden', 'value' => $value, 'name' => 'old_' . $i->name);
            $fields[] = array('label' => null, 'type' => 'html', 'value' => '</div>');
        }
        $fields[] = array('label' => null, 'type' => 'html', 'value' => '</div>');
        // if submitted
        if (X4Route_core::$post) {
            $e = X4Validation_helper::form($fields, 'gprivs');
            if ($e) {
                $this->permitting($_POST);
            } else {
                $this->notice($fields);
            }
            die;
        }
        // contents
        $view = new X4View_core('editor');
        $view->title = _GROUP_PERMISSION;
        // form builder
        $view->form = '<div id="scrolled">' . X4Form_helper::doform('gprivs', $_SERVER["REQUEST_URI"], $fields, array(_RESET, _SUBMIT, 'buttons'), 'post', '', 'onclick="setForm(\'gprivs\');"') . '</div>';
        $view->js = '
<script>
window.addEvent("domready", function()
{
	var myScroll = new Scrollable($("scrolled"));
});
</script>';
        $view->render(TRUE);
    }