I'm currently developing a web app that uses iframes that contain other people's sites (Think StumbleUpon). Some sites contain "Framebuster' though, these busters redirect my app to the site that the frame was containing.
This in-turn "kicks" users off my app, what would be a good way to alert users of this?
Would a "Sorry, [InsertSiteName] does not support this webpage, you are now being redirected" pop-up suffice?