Could you check your co-branded site for pop-ups and let me know what you get.
I've checked my own plus a few others at random found on google and Im getting pop-ups on them all.
I've spoken to Sean about it and he reckons there shouldn't be any at all and thought it may be a peice of spyware on my pc but Ive ran a few spyware programs which have returned nothing.
Let me know what you find or you could even just have a look for the hell of it and see what you get.
google search for streamray co-branded sites
By the way it only happenes on IE6 and not Mozilla
thanks
Mick