SWF Load play to end Unload - Load next SWF


I’m new to this forum and joined because I have spent several hours researching this basic question but either I find info that is too old (eg. Flash 5) or too complex for what I want to do.

In Flash 8, using ActionScript 2.0 I would simply like to load an swf intro into a container movie - let it play to the end (how can I tell when the last frame is finished) and then unload it to purge the memory (as there are some large bitmaps and animation that won’t play again) - then play the next swf - the actual main movie.

I don’t want a preloader script and I don’t want to activate these movies with buttons, which is what I’m coming up with when I search for this.