Knowing the language (url) of the user in a bilingual site

Hi,

Imagine this situation,

A bilingual web site with these urls for 2 languages :

www.mysite.com -> english
www.mysite.com/fr/ -> french

How can i know where is the user? In the english version or the french version?

Is there some url reader class that i can use in my vb code for retrieving the URL?

I want to do something like this (i will copy the same aspx page in both folder) :

If "the user is on the french version" then
       welcomebox.text = "Bienvenue!"
Else
       welcomebox.text = "Welcome!"


If you know a better way to do a bilingual site, let me know!

Thanks in advance
...