Codeigniter Scroll Pagination

This is my view file
friends_find_view.php


<link rel="stylesheet" href="<?=base_url()?>css/friends.css" type="text/css" media="all" />

    <div class="shell" >
    <!-- main -->
    <div id="main" style="width:760px">
        <div id='friend_display'>
        <?php if($list->num_rows() > 0  ){
     foreach($list->result() as $show){ ?>
        <!-- image box -->
        <div class="image-box" style="margin-left:30px" id='image-holder' >

            <div class="photo-cover">
                <img width="160px" height="117px" src="<?=base_url()?>uploads/user_images/friends/<?php echo $show->user_image;?>" alt="" />
            </div>

            <p class="photo-name"><b><?php echo $show->user_name;?></b></p>
            <!-- end photo name -->

        </div>
        <?php } } else { echo '<div align="center" style="color:#FF0000; font-size:17px; font-weight:bold">You have no Friends yet</div>';}?>
        <!-- end image-box -->
        <div class="cl">&nbsp;</div>
    </div>
    <!-- end main -->
    </div>

</div>


     <div class="loading1" id="loading1">Wait a moment... it's loading!</div>
    <div class="loading1" id="nomoreresults">Sorry, no more results....!</div>

        </div>


<script src="<?=base_url()?>js/libs/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
var page_num = 1;
$(function(){
    $('#friend_display').scrollPagination({
        'contentPage': '<?=base_url()?>friends/display_friends', // the url you are fetching the results
        'contentData': {page_num:$('.image-box').size()}, // these are the variables you can pass to the request, for example: children().size() to know which page you are
        'scrollTarget': $(window), // who gonna scroll? in this example, the full window
        'heightOffset': 10, // it gonna request when scroll is 10 pixels before the page ends
        'beforeLoad': function(){ // before load function, you can display a preloader div
            $('#loading1').fadeIn();
        },
        'afterLoad': function(elementsLoaded){ // after loading content, you can use this function to animate your new elements
             $('#loading1').fadeOut();
             $(elementsLoaded).fadeInWithDelay();
             page_num:$('.image-box').size();
        }
    });

    // code for fade in element by element
    $.fn.fadeInWithDelay = function(){
        var delay = 0;
        return this.each(function(){
            $(this).delay(delay).animate({opacity:1}, 200);
            delay += 100;
        });
    };
});

</script>


/*          End View  */

This is controller
Friends.php


<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Friends extends CI_Controller {

    function __construct()
    {
        parent::__construct();
        $this->load->model('friends_model');
    }


    function find_friends($offset=0)
    {
        $friend['list']     =   $this->friends_model->find($offset);
        $this->load->view('friends_find_view',$friend);
    }


    function display_friends()
    {
        $offset =   $this->input->post('page_num');

        $find   =   $this->friends_model->find($offset);

        if($find->num_rows() > 0    )
        {
            foreach($find->result() as $show)
            {   ?>

        <div class="image-box" style="margin-left:30px" id='image-holder' >
            <div class="photo-cover">
                <img width="160px" height="117px" src="<?=base_url()?>uploads/user_images/friends/<?php echo $show->user_image;?>" alt="" />
            </div>

            <p class="photo-name"><b><?php echo $show->user_name;?></b></p>
            <!-- end photo name -->

        </div>
        <?php } } else { exit; }?>
        <!-- end image-box -->
        <div class="cl">&nbsp;</div>
        <?php
    }
}

/* End Controller  */

This is code for my query to fetch record from model

    function find($offset)
    {
        $this->db->select('*');
        $this->db->from('users');

        $this->db->limit(6,$offset);
        $result = $this->db->get();
        return $result;
    }