Così può andare?
codice:
<form method="get" action="http://www.google.com/search">
   <fieldset>
      <legend>
         <a href="http://www.google.com">
            
         </a>
      </legend>
      <label for="q">Parola:</label> 
      <input type="text" id="q" name="q" size="31" maxlength="255" />
      <input type="hidden" name="hl" value="it" />
      <input type="submit" name="btnG" value="Avvia" />
   </fieldset>
</form>