How to load dynamic content (jquery) inside ajax call?

My homepage loads pages with jquery ajax call. In the Pictures subpage there is 3 div, and each loads a php with ajax, too. I would like to include a gallery js to every sub-subpage. However, the js does not loads. Here is my code in the index.php for the subpages:

<script type="text/javascript">
$(function()
{
  var actualmenu = 'fooldal.html';
  $('#tartalom').load('fooldal.html');
  $('.fooldal').click(function()
  {
    $('#tartalom').load('fooldal.html');
    actualmenu = 'fooldal.html';
  }
  );

  $('.kepek').click(function(){
 $('#tartalom').load('kepek.php', function(){
   $(document.body).on('click', 'a[rel=gallery_view]' ,function(){
    $(this).KeViewer('gallery', {'percent' : 70});
    return false;
  });
 });
  actualmenu = 'kepek.php';
 });
});
</script>

And there is my kepek.php page:

<script type="text/javascript">
$(function()
{
  $('#galeria').load('kepek_csenge.php');
  $('#csenge').click(function()
  {
    $('#galeria').load('kepek_csenge.php');
  }
  );
);
</script>

<div id="albums">
    <div class="album" id="csenge">
        Csenge
        <br/>
        <img src="albumok/csenge/01.jpg" alt="csenge"/>
    </div>
</div>
<div style="clear:both;"></div>
<div id="galeria" width="500"></div>

Inside kepek_csenge.php there are rows like this, which should trigger the gallery:

<a class="thumb_wrapper" href="albumok/csenge/01.jpg" title="Első" rel="gallery_view"><img alt="" class="thumb" src="albumok/csenge/thumbs/01.jpg" /></a>

Unfortunately it just loads a new page with the selected picture. How can i use the galleryviewer js in this page?