/**
  * get properties (offline)
  *
  * @access public
  * @param
  * 
  */
 public function getProperties()
 {
     global $lng;
     $this->plugin->includeClass("class.ilObjExternalContentAccess.php");
     if (!ilObjExternalContentAccess::_lookupOnline($this->obj_id)) {
         $props[] = array("alert" => true, "property" => $lng->txt("status"), "value" => $lng->txt("offline"));
     }
     return $props ? $props : array();
 }