Switching contents language in CodeIgniter

[eluser]KeyStroke[/eluser]
Thanks a lot gon! I have two more questions if you don't mind:

1) In language files, should English and Arabic array keys be different from each other (e.g: $lang['welcome_en'] and $lang['welcome_ar'])? or are they supposed to use the same key name since they're in different files?

2) How do I use the 'yourdomain.com/ar/home' URI structure when home is my default controller? I don't know how that would work with other controllers either.


Appreciate your help