úÎÖ´OReturns HTML element to be inserted in the form for which a CAPTCHA is wanted. reCAPTCHA public key Nothing or Just8 an error message returned by previous validate attempt Verify a CAPTCHA. reCAPTCHA private key .IP address of the user who solved the CAPTCHA (value of the recaptcha_challenge_field &value of the recaptcha_response_field Left error message, or Right () for success  recaptcha-0.1Network.Captcha.ReCaptcha captchaFieldsvalidateCaptcha