public function configure()
{
$this->setWidget('captcha', new opWidgetFormCaptcha());
$this->setValidator('captcha', new sfValidatorPass());
$formatter = new sfWidgetFormSchemaFormatterList($this->widgetSchema);
$formatter->setRowFormat("<li>%field%%help%\n%hidden_fields%</li>\n");
$formatter->setHelpFormat('<div class="help">%help%</div>');
$this->widgetSchema->addFormFormatter('opCaptchaFormFormatter', $formatter);
$this->widgetSchema->setFormFormatterName('opCaptchaFormFormatter');
$this->validatorSchema->setPostValidator(new sfValidatorCallback(array('callback' => array($this, 'validateCaptchaString'))));
$this->widgetSchema->setHelp('captcha', 'Please input the below keyword.');
}
