public function checkToChucUsers($permission = 0)
 {
     $users = $groups = array();
     $groupsModel = new Front_Model_Groups();
     $employeeModel = new Front_Model_Employees();
     $list_groups = $groupsModel->getGroupByPermission($permission);
     if ($list_groups) {
         foreach ($list_groups as $group) {
             $groups[] = $group->group_id;
         }
         $users = $employeeModel->getUsersByGroups($groups);
     }
     return $users;
 }