pagination error in set page

[eluser]Marlon Souza[/eluser]
Dear,
I have a problem in the IC pagination, when set the number, ou press a next page does not advance a number, but the data are ok, staying for page 1, how do solve?

Strange, because the admin of site I used the same code and the page runs nomal

Follow my code controllers and views

Code:

class Function extends Controller {

    function Function(){
        parent::Controller();
        $this->load->library('pagination');
        $this->load->model('Produtos_model');
        
    }

    function index($pagina=""){
        
        $dados['envio']="";
        $limite="15";    
        if($pagina==""){
        $pagina='0';
        }
        else{
        $pagina=$pagina;
        }
    

        
        $indice=$pagina;
        $config['base_url'] = 'http://DOMAIN.com.br/PAGE/index/';
        $query = $this->db->query("SELECT * FROM product WHERE id_pcat='1'");
        $config['total_rows']=$query->num_rows();
        $por_pagina=$config['per_page'] = "15";
        $this->pagination->initialize($config);
            if (isset($page) && is_int($page)){
                $offset = $page * $config['per_page'];
            }
            else{
                $offset = 0;
            }
        $dados['paginacao']= $this->pagination->create_links();
        $dados['produtos'] = $this->Produtos_model->categoriasSelecionar('1',$indice,$limite);

        $this->load->view('page',$dados);
    }
}

now is a model

Code:

public function categoriasSelecionar($id,$limit,$offset) {
        $query = $this->db->query("SELECT * FROM product WHERE id_pcat='".$id."' LIMIT ".$limit.",".$offset."");
        return $query->result();
    }

Await,
Thx and sorry to my english by translate.google