Button problems

I’m building a website and there are 4 buttons in the navigation area which call on 4 different movieclips. The movieclips display the content and what not. I was able to get it working ok except for one little detail which has been bugging me. If you click on a section once it’ll display fine, but if you click the same button again it’ll pretty much revert to frame one of that movie clip and play it again. I don’t want anything to happen if the button is pressed more than once. I’ve tried everything (probably not, lol)…gotoAndStop etc. etc. Help!! Thanks. :te:

My .FLA file