Adsense and conditionals

Hey guys, quick question:

now, i know to make it so guests see one set of images and members see another. However, I need an additional conditional to show no ads to a group.

For example:

I want to show:
BIG BLOCK ads to Guests
728 x 90 ads to Members
NO ads to a group called Subscribers

Can someone show me how to do this please?

Thanks

no matter, got it to finally work...lol