How to load movies with AS using seconds?

I have a video, 14 minutes long, at various times, I need to load information for a few seconds, and then unload it.

At the moment, I’m doing it all in the timeline which works fine, however I’m limited by 16,000 keyframes which for the last video, was about 7 minutes (full video was 9).

Is there a way to load and unload in 1 long action script file at the beginning of the video?

eg (not actual code btw)

at 4 seconds, load 1.swf into container1
at 14 seconds, unload 1.swf from container1
at 16 seconds, load 2.swf into container1
at 26 seconds, unload 2.swf into container1

and so on?