Stop(); and Play();

From my main movie (named main.swf), I did a LoadMovieNum command to load another SWF (named top.swf) to the third level. While on top.swf, I want to put stop and play buttons to control main.swf. How do I target main.swf from within top.swf?

_level3.stop();
_level3.play();

Level3 would target top.swf. I don’t need control in top.swf. I want to put code in top.swf to control main.swf.

level1?