rusty is right, and the suggestions are missing the point. It's a relatively new thing that started within the last few months. I used to be able to browse the forums on an iPad and had the same exact user experience as on my computers, which is the way it should be -- the iPad is completely capable of handling a full website. But then a few months ago, these popups started appearing on the site when viewed from an iPad, and they are obnoxious and poorly coded. They cause a page to re-size multiple times and follow down the screen as you scroll. Trying to dismiss is a crap shoot, since you have to tap a tiny "X" and not the ad itself. Something is not right.
They are more or less like the static banner ads seen on the TBN forum under normal conditions, which stay out of the way and are acceptable to me -- no need to block. Except on the iPad, they became floating ads that follow scrolling. My opinion is that it's just poorly coded ad display scripting, which is trying to handle the iPad differently when it doesn't need to. The older static ads worked fine on the iPad.