static function getServerList()
 {
     if ($list = self::getCachedServerList()) {
         return $list;
     }
     $servers = self::doCall("getServerList", null);
     if (!$servers) {
         return null;
     }
     foreach ($servers as $server) {
         $mollomServer = new MollomServer();
         $mollomServer->ServerURL = $server;
         $mollomServer->write();
         $mollomServer->destroy();
     }
     return $servers;
 }