Referring to other movie clips inside a movie clip

Okay, SO i have a movie clip, and to stop it i use

stop();

and to stop the main timeline I use

_root.stop();

and if I’m on the main timeline and i want to stop a movie clip i use

movieclipname.stop();

But if I’m already in a movieclip, and i need to control another movie clip, or a movie clip on the main timeline, how can do that?