CuLogin -- Login base on CodeIgniter Library

class CuLogin {

    function CuLogin()
    {
        $this->Login_Information();
    }

    function Login_Information(){
        $this->login_account = "useric";
        $this->login_password = "password";
    }

    function chk_login($account,$password){
        if (($account == $this->login_account) && ($password == $this->login_password))
            return true;
        return false;
    }

    function login($account = "",$password = ""){
        $CI = &get_instance();
        $CI->session->set_userdata("login",$this->chk_login($account,$password));
    }

    function islogin(){
        $CI = &get_instance();
        if ($CI->session->userdata("login"))
            redirect("bulletin","location");
        redirect("login","location");
    }

    function onlogin(){
        $CI = &get_instance();
        if (!$CI->session->userdata("login"))
            redirect("main","location");
    }


}