title: zend framework empty form after submit
body: <p>I have a form based on Zend_Form.<br>
  When form isn't valid, my inputs contain data.<br>
  But if all OK, after submiting form conains all data.  </p>
  
  <p>I know how clear form with help of jQuery.<br>
  But how I make it in Zend Framework?</p>