/**
  * Delete system style to category assignments
  */
 function deleteSysStyleCatAssignmentsObject()
 {
     global $ilCtrl, $lng, $rbacsystem;
     if (!$rbacsystem->checkAccess("write", $this->object->getRefId())) {
         return;
     }
     $ilCtrl->setParameter($this, "style_id", urlencode($_GET["style_id"]));
     $style_arr = explode(":", $_GET["style_id"]);
     if (is_array($_POST["id"])) {
         foreach ($_POST["id"] as $id) {
             $id_arr = explode(":", $id);
             ilStyleDefinition::deleteSystemStyleCategoryAssignment($style_arr[0], $style_arr[1], $id_arr[0], $id_arr[1]);
         }
         ilUtil::sendSuccess($lng->txt("msg_obj_modified"), true);
     }
     $ilCtrl->redirect($this, "assignStylesToCats");
 }