Syncing audio to animation in Flash 8

Hello All,

I am currently working on a project that requires me to sync dialog in a voice-over with text animations. When I view the file on my computer, everything is synced up perfectly. But on computers with a slower processing speed, there is a discrepancy between the timing.

I am using the following actionscript to start the audio in a frame script.

intro_audio = new Sound();
intro_audio.attachSound("intro");
intro_audio.start();

Is there anything I can do to ensure that the timing is standardized on any computer it is played on?

Thanks!
-Matt