Templateing in codeigniter

Template.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 
class Template 
{
    var $ci;
     
    function __construct() 
    {
        $this->ci =& get_instance();
    }

    function load($tpl_view, $body_view = null, $data = null) 
	{
	    if ( ! is_null( $body_view ) ) 
	    {
	        if ( file_exists( APPPATH.'views/'.$tpl_view.'/'.$body_view ) ) 
	        {
	            $body_view_path = $tpl_view.'/'.$body_view;
	        }
	        else if ( file_exists( APPPATH.'views/'.$tpl_view.'/'.$body_view.'.php' ) ) 
	        {
	            $body_view_path = $tpl_view.'/'.$body_view.'.php';
	        }
	        else if ( file_exists( APPPATH.'views/'.$body_view ) ) 
	        {
	            $body_view_path = $body_view;
	        }
	        else if ( file_exists( APPPATH.'views/'.$body_view.'.php' ) ) 
	        {
	            $body_view_path = $body_view.'.php';
	        }
	        else
	        {
	            show_error('Unable to load the requested file: ' . $tpl_name.'/'.$view_name.'.php');
	        }
	         
	        $body = $this->ci->load->view($body_view_path, $data, TRUE);
	         
	        if ( is_null($data) ) 
	        {
	            $data = array('body' => $body);
	        }
	        else if ( is_array($data) )
	        {
	            $data['body'] = $body;
	        }
	        else if ( is_object($data) )
	        {
	            $data->body = $body;
	        }
	    }
	     
	    $this->ci->load->view('templates/'.$tpl_view, $data);
	}


}