please help pagination

[eluser]jonny tran[/eluser]
path link http://localhost/hoakyvina.com/product/0&per;_page=&per_page=3 mouse hover.

how disable per_page??
code:
$name_cat = $this->uri->segment(2);
$id = (int)$this->uri->segment(4);
$total = ''; // Tổng số bản ghi
$page_item = (int)$this->config->item('myn_product_item_page'); // Số bản tin trên 1 trang
$page_current = (int)$this->uri->segment(5);
$cat_name = $this->uri->segment(3);

$items = $this->data_model->get_items( $this->langid, $id, 'products', $page_item, $page_current, $total );

/**
* Phân trang
*/
$this->load->library('pagination');
$config['base_url'] = base_url().'/cats/'.$name_cat.'/'.$cat_name.'/'.$id;
$config['total_rows'] = $total;
$config['per_page'] = $page_item;
$config['cur_page'] = $page_current;
$config['next_link'] = $this->lang->line('next_link');
$config['prev_link'] = $this->lang->line('prev_link');
$config['first_link'] = $this->lang->line('first_link');
$config['last_link'] = $this->lang->line('last_link');

$this->pagination->initialize( $config );
please help?