Where to put certain code

[eluser]invi[/eluser]
Hello everybody, I have similar problem to jaswinder_rana's. I'm using dx_auth and when I insert this kind of code in my view file:

Code:

<?
if (! $this->dx_auth->is_logged_in())
{
     $this->load->view('auth/logowanie.php');
}
else
{
     $this->load->view('auth/menu.php');
}
?>

I have an error:
A PHP Error was encountered

Severity: Notice

Message: Undefined property: CI_Loader::$dx_auth

Filename: views/index.php

Line Number: 28

Fatal error: Call to a member function is_logged_in() on a non-object in public_html/system/application/views/index.php on line 28

Could you help me with this?