Stopping external movie whitout buttons. Help!

Hi,
I have a main movie with a container movieclip. I load an external movie “Ext1.swf” into this movie clip. It works.
I want to control the container (stop and play). It works with buttons, but I want to make two functions named Ex1Stop and Ext1Play to stop and play the container WHITOUT any buttons.

Any help on this?

Regards