public function executeImage()
 {
     $theme = sfConfig::get("app_phpcaptcha_theme", "Small");
     if (class_exists("PHPCaptcha" . $theme . "Theme")) {
         eval("\$theme = new PHPCaptcha" . $theme . "Theme();");
     } else {
         $theme = new PHPCaptchaSmallTheme();
     }
     $oVisualCaptcha = new PhpCaptcha($theme);
     $oVisualCaptcha->setOwnerText(sfConfig::get("app_phpcaptcha_ownertext", ""));
     $oVisualCaptcha->setHeight(sfConfig::get("app_phpcaptcha_height", $theme->getOption('height')));
     $oVisualCaptcha->setWidth(sfConfig::get("app_phpcaptcha_width", $theme->getOption('width')));
     $oVisualCaptcha->Create();
     return sfView::NONE;
 }