lightbox in page loaded with ajax

Hello, I'm trying to create a new page in php but I do not know anything at all. I just used java that I removed from an example to dynamically load pages and to do one lightbox ... the problem is when I want to conjugate the 2 .... I want the lightbox to work inside a page loaded with ajax .... here is the code:

page index.php

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script><scripttype="text/javascript">
  $(document).ready(function(){
    $("#menu a").click(function( e ){
      e.preventDefault();
      var href = $( this ).attr('href');
      $("#center_content").load( href +" #center_content");
    });
  });
</script>

and in the "center_content" div the contents are loaded .... now on the content page with lightbox

<script type="text/javascript" src="http://code.jquery.com/jquery-1.11.0.min.js"></script><scripttype="text/javascript" src="http://code.jquery.com/jquery-migrate-1.2.1.min.js"></script><scripttype="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/fancybox/1.3.4/jquery.fancybox-1.3.4.pack.min.js"></script><scripttype="text/javascript">
  $(function($){
    var addToAll = false;
    var gallery = false;
    var titlePosition = 'over';
    $(addToAll ? 'img' : 'img.fancybox').each(function(){
      var $this = $(this);
      var title = $this.attr('title');
      var src = $this.attr('data-big') || $this.attr('src');
      var a = $('<a href="#" class="fancybox"></a>').attr('href', src).attr('title', title);
      $this.wrap(a);
    });
    if (gallery)
      $('a.fancybox').attr('rel', 'fancyboxgallery');
    $('a.fancybox').fancybox({
      titlePosition: titlePosition
    });
  });
  $.noConflict();
</script>

NOTE: I can not put the script's calls but they are the .... Can someone tell me what to modify? because of this I do not understand NOTHING!