anti-ad blocking (anti-leech) system?

[Spinball]

I think this issue will affect a lot of vB users since many of us rely on advertising for the survival of our sites.
MarcoH64 - interesting solution. Makes life a bit more complicated for regular users, though.
Deaths - yes - I want the system to try and serve a banner and if it fails, a different page opens explainaing why they are not allowed to access the site.
AN-net - we reply on advertising to pay the very large running costs of the site. I have written a proprietory php ad serving script which I could edit if I knew how to test whether they have ad blocking on or off.
Common sense tells me that the web server is instructed not to serve the graphic and text which are identified as an advert. The fact that this has happened must surely be detectable?
Reeve of shinra - what about people who are not using cookies? Stuffs the site up for them, too?
Thanks all for your replies.
My fingers are still crossed that someone knows a solution.

Originally Posted by Deaths

Is there a way to block ads? Banners I mean.

You could maybe insert some vital code into the ad code, so if they block the ad the forums are all messed up

Actually I guess it might be possible to have the default style show black text on a black background, and have the proper forum style override this and embedded in the banner? Does anyone know how to do this?