codice:
<script type="text/javascript" src="jquery-1.5.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {  
  $("#invio_dati").submit(function(){ 
      $.post('test.php', $("#testform").serialize(), function(data) {
          $('#output').html(data);
      });
      return false;  
  });
});
</script>

<div id="output"></div>


<form id="testForm">
<input type="text" name="name">
<input type="text" name="time">
<input type="submit" id="invio_dati" value="invia">
</form>