use target_mc.loadMovie("external.swf") that will load ur
external movieclip inside target_mc.
Not that once u write that action target_mc becomes empty ,
it will be replaces with the external.swf
as for the loaded area, in both cases there is no
restriction, so u will see again the "whole" area of external
movieclip, u want to cut some of, u have to use mask the