loading comments page with jQuery

hi guys,... I switching to jQuery from Prototype on cake1.3

and I want to load comments page from... /profile_comments/ajax_show.ctp to profile ../user/show.ctp page,... but its not loading... 

and I have latest jquery Javascripts in place... can anyone help please... 

this is my /users/show.ctp 

    <div id="comments"></div>

<script>

  $("#comments").load("<?php echo $html->url('/profile_comments/ajax_show/profile_id:' . $user_obj['User']['id']) ?>");

</script>

this is my function: 

  

  function ajax_show()

  {

    $this->layout = 'empty';

    $id = array_key_exists('profile_id', $this->params['pass']) ? $this->params['pass']['profile_id'] : null;

    

    if(!($user = $this->User->findById($id)))

    {

      die();

    }

    else

    {

      $this->set('url_options', array('profile_id' => $id));

      $this->set('user_obj', $user);

      $this->set('profile_comments', $this->paginate('ProfileComment', array('profile_id' => $user['User']['id'])));

      $this->set('offset', ($this->params['paging']['ProfileComment']['page'] - 1) * $this->paginate['limit'] + 1);

    }

  }

and it must load a page from ../profile_comments/ajax_show 

 BUT IT's NOT DOING ANYTHING...

verses to Prototype which works in cake1.2 version 

    <div id="comments"></div>

    <script>

    new Ajax.Updater("comments", "<?php echo $html->url('/profile_comments/ajax_show/profile_id:' . $user_obj['User']['id']) ?>", { evalScripts:true, onComplete:function() { $("comments_loading").hide() } });

    </script> 

thanks in advance 

chris 

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