At the end google adsense isn't the best choice for this forum, it seems the ads slots (now) it is profitable/useful for all the community. As everyone of you told : the security is the most important thing in this forum.
You won't tell me that one of the biggest companies on the world will makes a big website like Bitcointalk simply gets hacked just because we used JavaScript Ad . Will you ? Pretty sure there is no exploits on ads
~ Madness
Javascript ads banners are insecure, I don't know why theymos (the real reason) aren't using js code for the various banner here in the forum but for the moment with the simple html/css the forum is "almost" secure.