Ah, might not be possible to do it then.I could add you as admin on the Victoria II Wiki and you could see what you could do ? I am not a html mogul, I'm only good with some Wiki editing Besides, I do not manage the Mediawiki program myself as this is freely hosted on ShoutWiki.
Have you considered moving to an independently hosted website instead? Hosting doesn't cost that much, and it gives a lot more control over things like ads, but also extensions and such.
Hell, I could probably host it on my server; I've got enough space for at least a few more wikis.