update a field with ajax

i wrote this module to update an existing form with a field that indicate the time with ajax

this is my "test.module"

function test_form_alter(&$form, $form_state, $form_id) 
{

if ($form_id=="webform_client_form_9")
{

    $form['time'] = array(
    '#type' => 'textfield',
    '#title' => t('time'),
    );

	}

drupal_add_js(drupal_get_path('module', 'test') .'/test.js');
	
	
	
	}

this is my "test.js"

   function changeHeure() {
      jQuery.get("getTime.php", {}, reponseServeur);
    }

    function reponseServeur(texte, erreur, requete) {
      $("#edit-time").html(texte);
      setTimeout(changeHeure, 1000);
      alert("hello");
	}
    function initializePage() {
      changeHeure();
    }
    $(initializePage);

and this is getTime.php

       print date('h:i:s');
    

i dont know where is the probleme

i have the time field in the form but there is no time in

edit-time is the id of the field when il see the source html of the page of the form

any idea? thanks a lot