javascript - Move figcaption inside anchor -

i need modify dom move figcaption inside element. i'm trying this, not working:

$('.wp-caption-text.gallery-caption').insertafter('img.attachment-full');

this code:

<figure class="gallery-item">    <div class="gallery-icon landscape">      <a href="#" class="fancybox image" rel="gallery-0"><img src="#" class="attachment-full"></a>    </div>    <figcaption class="wp-caption-text gallery-caption" id="gallery-1-365">      <h2>gilles herzog</h2>    </figcaption>  </figure>

any ideas? lot!