Roll back to different captcha if recaptcha.net is unavailable

My only concern with reCAPTCHA is that users will not be able to access areas with a captcha if recaptcha.net is unavailable ("Could not open socket"). In this case, it would be smart for recaptcha.module to be able to roll back to a different captcha that has no dependency on an external site.

This is the idea:

  // verify recaptcha.net exists
    $connect = @fsockopen($recaptcha_api_server, 80);

    if (!$connect) continue;

    } else {
      watchdog('recaptcha', "Could not connect to recaptcha.net.");
      return;
    }
  }

  if (! $connect)
    // roll back to default captcha setting