[Help Wordpress] shortcode not working / ajax call

hi

i'm trying to show the slider after an ajax call - the function in functions.php :

function ajax_get_projet($id){
$post= get_post($id); 
$content = $post->post_content;
echo $content;
}

is returning only the shortcode : [gallery ids="18,21,22,20,19" royalslider="2"]

if i try :

echo do_shortcode('[gallery ids="18,21,22,20,19" royalslider="2"]');

the first image is showing but no controls

viewing the post in is 'normal' page show the gallery fine

can you help me on this?

thanx

.

help.dimsemenov.com