I18n remove default language from url

[eluser]Unknown[/eluser]
Hi
I want to create multi-language site based on this https://github.com/Crypt/CodeIgniter-i18n script, but
there is one missing config.
It should be a config allowing to create url without default language for exmaple:
www.site.com/ <---- load default language
www.site.com/lang_prefix <------ load lang_prefix (without default lang_prefix) language

Is there any way to remove lang_prefix form default language in url?

[eluser]Tpojka[/eluser]
Check here.

[eluser]Unknown[/eluser]
[quote author="Tpojka" date="1394022966"]Check here.[/quote]

Thanks I know about that, but maybe it's possible to change script from my first post, any suggestions?