Only playing a SWF file one time per session

I am working on a flash website made of many .fla files. In each individual .fla file, it calls in various external .swf files. On one of the .swf files is only audio that loads when the user plays the movie. When they go back to the main menu and select that particular flash movie or section of the website again, the .swf file triggers and plays the audio again. Basically, I do not want that audio to play each time they re-enter that section of the website or I do not want that .swf file to reload if it already has been loaded during that session. Any thoughts on how to accomplish this? Currently I have the following, but it is not working. The .swf file with the audio still loads every time:

haslistenedtoaudio = false

if (haslistenedtoaudio == false){
loadMovieNum(“audioMovie.swf”, 3);
haslistenedtoaudio = true;
}

Thanks!