select menu don't appear on ie7 after an ajax request

select menu don't appear on ie7 after an ajax request

I have the following problem : 
on doing a ajax request on a php file in order to show customer informations. In these informations, I'm building a select menu. this select menu doesn't appear on the page result on ie7 where it works fine on safari and firefox.
here is the code :
the AJAX request on the gestionCommande.php file
  1. if ($('#connecte').length) {
  2. $("#information_livraison_facturation").css({display:"block",opacity:0}).animate({opacity:1}, function () {
  3. $("#information_facturation").css({display:"block",opacity:0}).animate({opacity:1}, function (){
  4. $.ajax({
  5. type: "POST",
  6. url: "inc/gestionCommande.php",
  7. dataType:'html',
  8. data: "choix=afficher-facturation",
  9. success: function (msg) {
  10. $("#information_facturation").find(".information-finale").html(msg);
  11. gestionChangementDateAMAP();
  12. return false;
  13. }
  14. });
  15. return false;
  16. });
  17. });
  18. }
the "gestionCommande.php" code
  1. $informationFacturation .= '<div class="information_standard" 
  2. id="changer_amap_livraison" 
  3. style="width:100%">'.listeAmap($sql_result_amap['nom_amap']).'</div><div class="titre_information"><strong>Date de livraison</strong></div>';
the create menu function.
  1. function listeAmap($selectedAmap) {
  2. $sql_amap ="Select id_amap,nom_amap,code_postal_amap,ville_amap FROM liste_amap ";
  3. $requete_sql_amap = mysql_query($sql_amap) or die("Erreur recherche amap : ".mysql_error());
  4. $informationFacturation = '<SELECT name="liste_amap" id="nouvelle_liste_amap" size="1">';
  5. while($sql_result_amap = mysql_fetch_array($requete_sql_amap)){
  6. if ($sql_result_amap['nom_amap']==$selectedAmap) {
  7. $informationFacturation .= '<option value="amap-'.$sql_result_amap['id_amap'].'-'.$sql_result_amap['nom_amap'].'" selected>Amap <strong>'.utf8_encode($sql_result_amap['nom_amap']).'</strong> - '.utf8_encode($sql_result_amap['code_postal_amap']).' '.utf8_encode($sql_result_amap['ville_amap']).'</option>';
  8. }
  9. else {
  10. $informationFacturation .= '<option value="amap-'.$sql_result_amap['id_amap'].'-'.$sql_result_amap['nom_amap'].'">Amap <strong>'.utf8_encode($sql_result_amap['nom_amap']).'</strong> - '.utf8_encode($sql_result_amap['code_postal_amap']).' '.utf8_encode($sql_result_amap['ville_amap']).'</option>';
  11. }
  12. }
  13. $informationFacturation .= '</SELECT></div>';
  14. return $informationFacturation;
  15. }
any idea ?

regards,