Attach drupal ajax events to links that were loaded via ajax
Try using the "use-ajax" class on the link


  In addition to using Form API for doing in-form modification, Ajax may
  be enabled by adding classes to buttons and links. 
  
  By adding the 'use-ajax' class to a link, the link will be loaded via an Ajax call.
  
  When using this method, the href of the link can contain '/nojs/' as
  part of the path. When the Ajax framework makes the request, it will
  convert this to '/ajax/'. 
  
  The server is then able to easily tell if
  this request was made through an actual Ajax request or in a degraded
  state, and respond appropriately.
  
  Source: http://api.drupal.org/api/drupal/includes%21ajax.inc/group/ajax/7


e.g:

array(
    '#type' =&gt; 'link',
    '#title' =&gt; t($title),
    '#href' =&gt; $href,
    '#attributes' =&gt; array(
        'class' =&gt; array('use-ajax'),
        'rel' =&gt; url($href),
    ),
);