cambiare i campi di un FORM tramite un SELECT

[Yoava333]

  
 <form action="">
  <select onchange="this.form.action = this[this.selectedIndex].value;alert(this.form.action)">
   <option>-</option>
   <option value="t.asp">testi</option>
   <option value="f.asp">files</option>
  </select>
 </form>