Zend FR

class My_Form_Decorator_Errors extends Zend_Form_Decorator_Errors
{
  public function render($content)
  {
    $element = $this->getElement();
    $view = $element->getView();
    if (null === $view) {
      return $content;
    }
    $errors = $element->getMessages();
    if (empty($errors)) {
      return $content;
    }
    $htmltag = $element->getDecorator('Htmltag');
    if ($htmltag !== false)
        $element->getDecorator('Htmltag')->setOption('class', 'ctrlHolder error');
    $formErrors_Helper = $view->getHelper('formErrors');
    $formErrors_Helper->setElementStart('<p class="errorField"><strong>');
    $formErrors_Helper->setElementSeparator('</strong></p><p class="errorField"><strong>');
    $formErrors_Helper->setElementEnd('</strong></p>');
    return (parent::render($content));
  }
}