public function act_delete_intervention()
 {
     if ($_GET['intervention_id']) {
         $intervention_ids = array($_GET['intervention_id']);
     } else {
         $intervention_ids = $_POST['interventions'];
     }
     if (!$intervention_ids || isset($_POST['no'])) {
         set_redirect_header('events', 'intv_list');
         return;
     }
     $this->intervention_ids = $intervention_ids;
     $this->del_confirm = true;
     if (isset($_POST['yes'])) {
         if (isset($_POST['intervention'])) {
             array_push($intervention_ids, $_POST['intervention']);
         }
         //if multiplt events are selected
         if (is_array($intervention_ids)) {
             foreach ($intervention_ids as $intervention) {
                 $i = new Intervention();
                 $i->DeleteFromRecordNumber($intervention);
             }
         }
         set_redirect_header('events', 'intv_list');
         return;
     }
     $this->intv_list = Browse::getIntvListArray($intervention_ids);
 }