[Mediawiki-l] Forcing a disclaimer to be displayed

[alain bellet]

Hi,
We are developing a project of an online encyclopedia of simple  
technologies and practical knowledge (www,howtopedia.org). For this  
Platform we use Wikimedia.
Cause of the potential risk of misuse of such technologies we decided  
to force the user to pass through a disclaimer validation process (to  
discharge us from reponsability in case of accident etc...).
For implementing this I have to put a test (session + cookie based)  
to all articles.
Where would be the best place to put this code?

Thanks in advance for your answers,

Best
Alain Bellet