// Get a helper instance without a form tag
$captchaHelper = WebFormHelper::createWebFormHelper($this, 'captcha_code', false, false);
$captchaHelper->addFieldText('captcha_code', "Bitte wiederhole den Code:");
-$captchaHelper->addInputTextField('captcha_code');
+$captchaHelper->addInputTextField('c_code');
$captchaHelper->addInputHiddenField('hash', $this->readVariable('captcha_hash'));
$captchaHelper->flushContent();