Help trying to figure out how

Ok, where do i begin… Say i have n buttons… And each those buttons load an external movie. And there is a “curtain” movieclip that opens/closes. So when the main movie loads for the first time, the “curtain” is closed while the external movie is loading. Then it opens after it has loaded. When i click on another button, the “curtain” closes again, loads another movie, then opens again. But if i click on the same button, nothing should happen.
How should i go about coding this? I hope i was clear… hehe. Thanks in advance. :slight_smile: