public static function login($rsObj, $force = false)
 {
     if (self::$create_loginObj === true || $force === true) {
         self::$loginObj = new RSLoginObj();
         self::$create_loginObj = false;
     }
     if (self::$loggedin === false || $force === true) {
         $rsObj->login(self::$loginObj);
         self::$loggedin = true;
     }
 }