* (make sure that you're typing in the keyframe, & not on the Movie Clip)
3. go back to the _root timeline & delete everything on the stage, so that all you have is an empty keyframe.
4. type this into the empty keyframe:
5. in the library, right-click on mc1, select 'Linkage' from the menu, & then click on 'Export For Action Script', then click 'Ok'. Do the same thing for mc2.
6. Test the movie.
Here's the explanation:
the Linkage/Export For ActionScript makes it so that the Movie Clip can be dynamically loaded from the library & doesn't need to be on the stage.
_root.attachMovie('mc2','mc2',10,{_x:286,_y:183});
this attaches the 'Linkaged' Movie Clip from the library. The first parameter inside the () is the linkage ID (what it's called in the library. the second parameter is the new name (I just used the same name). The third parameter is the depth to attach, & the fourth is the _x & _y points to attach the movie to.
_root.mc2.gotoAndPlay(1);
this isn't really needed because the Movie Clip will play automatically.