I don't have control over the pop ups they are part of the service we use from boardhost.com for our free message board. It is essentially the cost for using their service. I tried to create and promote a board on our system that was controlled by the site and would allow other features like pictures and would be saved on our site but it didn't go over very well. It was a little more complicated and cumbersome I guess. Anyway the pop ups are how boardhost is able to stay in business and provide us with a free service.
Thx for your consideration