Actualiser un div avec cookie et jquery ajax

var refresh = setInterval(function () {
                $.ajax({
                    url : "....",
                    success : function(data) {
                        $("#NowPlaying").append(data);
                    }
                });
                }, 10000);

 setcookie("radio_artist",$artist,time()+3600, "/");
 setcookie("radio_song",$songname,time()+3600, "/");

// $artist et $songname sont les variables généré par la requete de départ...

<script>
function getCookie(c_name)
{
var c_value = document.cookie;
var c_start = c_value.indexOf(" " + c_name + "=");
if (c_start == -1)
  {
  c_start = c_value.indexOf(c_name + "=");
  }
if (c_start == -1)
  {
  c_value = null;
  }
else
  {
  c_start = c_value.indexOf("=", c_start) + 1;
  var c_end = c_value.indexOf(";", c_start);
  if (c_end == -1)
  {
c_end = c_value.length;
}
c_value = unescape(c_value.substring(c_start,c_end));
}
return c_value;
}

function urldecode(str) {
   return decodeURIComponent((str+'').replace(/\+/g, '%20'));
}


var interval = 3000;
CookieFct = setInterval(function () { 

 var song=getCookie("radio_song");
 var artiste=getCookie("radio_artist");

 //alert(cookie);
 if (song!='<?Php echo $Song; ?>') { // $Song est la variable repenant l\'ancien cookie
  //alert(artiste);
  document.getElementById("ArtisteName").innerHTML =urldecode(artiste);
  document.getElementById("SongName").innerHTML =urldecode(song);
 } 

}, interval);
</script>