funzione cancella con name differente

[Vindav]

<form id="googleForm">
    <input type="text" value="Ricerca" id="q" name="q"/>
<input type="submit" value="Google" formaction="http://www.google.com/search"/>
</form>

<script>
document.getElementById("googleForm").addEventListener("submit", function(){
  document.getElementById("q").value += " TESTO CHE VUOI AGGIUNGERE";
});
</script>