Language selection hypertext link

Hello,

I would like to know the code for a language selectino by using hypertext links (<a href=...>Language</a>).
They're only tow languages availables for my forums, french and english, and i set up the detectino language code. But i would like people that aren't english or french(and them too) to select the language they want to see the forums to be displayed by a simple hypertext link. Working for the guest and the members.
I hope you see what i would like to do, thank you in advance!