Just testing some stuff you've already seen as an animated gif...
The meaning is, that when you click on a film poster you’ll link to the inside, where you can watch the trailers and extra info on a movie screen. When you do, you’ll first see a short animation of the curtains opening and the lights dimming. I thought this would aid to a more realistic movie going feel.
Bye the way... this was one of those rare cartoons I didn’t need to use any white paint to "fix" little inking mistakes.