im facing problem while redirecting my user according to its type. how can do it here's my code plz suggest how to do it.

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class VerifyLogin extends CI_Controller {

function __construct()
{
  parent::__construct();
  }

 function index()
{
       $this->load->model('user','',TRUE);

  //This method will have the credentials validation
   $this->load->library('form_validation');
   $this->load->library('session');

   $this->form_validation->set_rules('username', 'Username','trim|required|xss_clean');
    $this->form_validation->set_rules('password', 'Password'
      'trim|required|xss_clean|callback_check_database');

      if($this->form_validation->run() == FALSE)
      {        

 //Field validation failed.&nbsp; User redirected to login page
  validation_errors();

 $this->load->view('error');
  }
 else
  {
 //Go to private area

basically here i want to redirect if user is admin then redirect to admin page else redirect to home how can i do this ???

        redirect('home', 'refresh');
     }


    }




       function check_database($password)
   {
    //Field validation succeeded.  Validate against database
      $username = $this->input->post('username');

       //query the database
       $result = $this->user->login($username, $password);

     if($result)
     {
      $sess_array = array();
       foreach($result as $row)
      {
       $sess_array = array(
     'id' => $row->id,
     'username' => $row->username
   );
   $this->session->set_userdata('logged_in', $sess_array);

        }
      return TRUE;
    }
    else
     {
 $this->form_validation->set_message('check_database', 'Invalid username or password');
 return false;
    }
   }  
     }
  ?>