Bonjour Magali, No, unfortunately it's not possible to have multiple levels of tabs within Header Tabs. I suppose you could add such a thing to the code, but I think it would require a fairly big overhaul of the extension. If you do decide to do such a thing, and it works, I would definitely be interested to see the code, though. -Yaron -- WikiWorks · MediaWiki Consulting · http://wikiworks.com