AddThis

problem width the sharing endpoints

Hi,
i am using addThis button in a fancybox,
after reading several answers in your forum i tried to use the sharing endpoints, but, i do not manage to have the title and the choice in the différents thumnails that we usually have even with the facebook Open Graph.

here the code i used :
<a href="http://api.addthis.com/oexchange/0.8/forward/facebook/offer?url=http://www.baudoin-lebon.com/<?php echo $lang;?>/artistes/oeuvres/<?php echo $id_artist; ?>/<?php echo string2url(getArtistFullName($id_artist));?> "rel="nofollow"class="addthis_button_facebook" title="<?php echo getArtistFullName($id_artist);?>"><img src="/site/graphisme/facebookGris.png" width="16" height="16" border="0" alt="Share to Facebook" /></a>
<a class="addthis_button_email"><img src="/site/graphisme/mail.png" width="20" height="13" border="0" alt="Send by mail" /></a>
<script type="text/javascript">$(document).ready(function(){
var script = 'http://s7.addthis.com/js/250/addthis_widget.js#domready=1';
if (window.addthis) { window.addthis = null; } $.getScript(script);});</script>

it is visible on this page when you click on a thumbnail:
http://baudoinlebon.curator.scarabe.biz/fr/artistes/oeuvres/232/malala-andrialavidrazana

username : curator
pass : demo

thank you very much for your help,
emilie