SendAjax无法正常工作

in my xhtml page i have a field where the user put an adresse and when he click on the buton then gps coordinates are displayed in too input text. i want to add ajax to insert these too values into a database. i use this script in my xhtml page.

    <script type="text/javascript">

var geocoder = new google.maps.Geocoder();
 addr, latitude, longitude;

    function geolocalise(){
  addr = document.getElementById('adresse').value;
        geocoder.geocode( { 'address': addr}, function(results, status) {
            // Si g?oloc OK 
            if (status == google.maps.GeocoderStatus.OK) {  

            latitude = results[0].geometry.location.lat();
            longitude = results[0].geometry.location.lng();
    document.getElementById('lat').value = latitude; 
    document.getElementById('lng').value = longitude; 


    document.getElementById('aa').innerHTML=longitude;

    var sendAjax = $.ajax({
        type: "POST",
        url: 'http://10.0.2.2/xx/insert-in-bdd.php',
        data: 'lat='+latitude+'&amp;lng='+longitude+'&amp;adr='+addr,
        success: handleResponse
       });
      }
      function handleResponse(){
       $('#answer').get(0).innerHTML = sendAjax.responseText;
      }
     });
    }
  </script>

i tested milion times..nothing seems to work. The url

url: 'http://10.0.2.2/xx/insert-in-bdd.php',

is pointing to my localhost, the php file is in C:/Wamp/xx

my php file is

<?php
 header('Content-type: text/html; charset=ISO-8859-1');
 if(isset($_POST['lat']) && isset($_POST['lng'])){
  $lat = addslashes($_POST['lat']);
  $lng = addslashes($_POST['lng']);
  $adr = addslashes($_POST['adr']);
  $db = mysql_connect("localhost", "root", "");
  $select = mysql_select_db(project, $db);
  mysql_query('INSERT INTO test (lat,lng,adresse)
               VALUES('$lat')');
  echo 'Vos coordonnées ont bien été insérées en base de données.';
 }else
   echo 'Problème rencontré dans les valeurs passées en paramètres';
?>

note: I create the database project and the table test

im caling the geolocalise here:

<input type="text" id="adresse"
        value="saisissez votre adresse"
        style="width: 291px; border: 1px solid #ccc;" /> &nbsp;  <input
        type="button" onclick="geolocalise()" value="geoooo"
        style="border: 1px solid #ccc; padding: 1px; cursor: pointer;" />
    <br />
    <br />

     Latitude : <input type="text" id="lat" value=""
        style="border: 1px solid #ccc;" /> &nbsp;
         longitude  <input
        type="text" id="lng" value="" style="border: 1px solid #ccc;" />

<div id="answer">Réponse</div>

why is not working Thank you for helping me