CI 2.1 url & parameters

[eluser]Unknown[/eluser]
Hi all

1/ Early newbie in CI & OOP

2/ How to ?

I'd like to have uri like :

/en/ci-book_1_196.html


I use :
>

Code:

$config['enable_query_strings'] = TRUE;

> RW rules to grab & send params to index.php from url

But where/how to properly set global vars like lng in order to have
something like :

Code:

$this->lang->load('common', $lng);

Thanks for advice.
S33N