submitform()

[var]

così?

<SCRIPT language="JavaScript">
  function submitform(dove)
  {
    document.na_form.action=dove;
    document.na_form.submit();
  }
</SCRIPT>

<form name="na_form" method="post">
  <input type="hidden" name="nome_autore" value="valore">
</form>
<a onclick="submitform('pagina.php?parametro1=valore1')">

ciao