Slide Presentations + MovieClips

Hi, I have a slide presentation that contains around 25 slides. In each of these slides I have a couple of movieclips. But when I test the slide presentation it seems like all movieclips starts to run on the first slide, even those on slide 23,24,25 etc.

Is the only way to make them play when you actually see that frame to use actionscript code? Like this:
on(reveal) {
myMC.gotoAndPlay(1);
}

How would you do it? Maybe the best way would be to put all content in a separate movieclip for each slide? I’m a bit confused over this, I haven’t bought Flash CS3 yet, but are there any improvements to slide presentation in CS3?