Adsense and Adbrite banner on same page?

Is it okay if I put both Adsense and Adbrite ads on the same page..? or any other CPM banners with adsense?
Also, I read in so many forums that Popunders are not allowed by Google.. Is it?

Anyone pls help..

I saw so many websites with Adbrite and adsense on the same page... so, I think there's no problem with it.
And Yes.. Adsense hate popups and popunders.

Yes, you can. I've seen many websites doing it also but I just don't know how to do it.

Yes, you can put adsense and adbrite together, but don't use the exact same colors for adsense and adbrite. That's the only condition by adsense: not to make them look exactly the same.
As for pop under and pop ups, it's better to keep out of that anyway, not just for adsense, but because nobody likes that and it will only increase usage of adblockers in internet population.

And also Google don't like any other contextual ads running together with adsense.

And also Google don't like any other contextual ads running together with adsense.

Actually, this was true up until one or two years ago. Before it was not possible to mix adsense with another contextual ads, but adsense modified its policies and now contextual ads are allowed, but they must not be confused with adsense (so don't use the same colors for link, text and url)

Make them different looking, and it's fine, check the adsense policies again!