ActionScript 2.0 :: Play Intro Animation Just One Time

In the timeline I have a main menu on frame 1 and four subsections on frames 10,20,30, and 40. I have four buttons on the main menu label("button001"; "button002";"button003", and "button004"), each one is sending the movie to a specific label (i.e: "section001", frame 10; "section002", frame 20; "section003", frame 30; and "section004", frame 40). In each one of those specific frames/labels (10,20,30,and 40) I have a movie clip that contains the section. It starts with a simple animation and ends in a stop. And this is what I want to do: play the animation just once.

Let's say in the main menu; when pressing one of the four buttons, the movie goes to one of those specific frames and the animation starts. For instance, I press "button001" and send my movie to the "section001" label. Then I return to the main menu and press again the "button001"; I don't want the animation to play again, I want to start in the stop point. So, I think about using some kind of conditional, but it's not working. Inside the "section001" movie, I put the following code on the first frame:

ActionScript Code:
stop();
var section001_intro = false;
if (section001_intro = true){
//"section001_stop" is a label I put on the last frame of the movie clip
gotoAndStop("section001_stop");
}else{
nextFrame();
}

Then on the last frame, when the movie stops, I wrote this code:
ActionScript Code:
var section001_intro = true;

So, my idea is that the first time the movie is played, the animation is played; then, I indicate in the last frame that the move has been played. next time I go to the "section001" label the movie must skip the animation and go directly to the "section001_stop" label.