Easy way to switch language

[eluser]liri[/eluser]
Ok so,

Seems like I needed to load the session library in each controller (parent and child).
Is this how it should be?

Secondly, what is the code in the front controller's construct for about
item data? seems like it's never get read to there or written to there at all?
I'm talking about:

Code:

if($this->session->userdata('language'))
        {
            $this->config->set_item('language',$this->session->userdata('language'));
            $this->config->set_item('language_code',$this->session->userdata('language_code'));
        }
        $this->current_culture=$this->config->item('language');
        $this->culture_code=$this->config->item('language_code');