"Would you like to stay connected" prompt for hots

I want to prevent people from staying connected while they are away from their machines for extended periods of time. Currently I set a “session-timeout” for the hotspot user profile. This is not ideal though as I would like for those who are present at their computers to be able to stay connected. Is there any way to do a “Your session is about to expire, click here to stay connected” pop-up like they do on banking websites?