In the main timeline, make the third layer and call it helpers. There we will place 2 helping movie clips; director and update. Place them off the stage, because they will be helpers only and we do not have to see them. After finishing movie, you could hide them behind the images.
Make movie clip update on the same way as we made mc, use rectangle tool, select it, press F8, name it update, then right click it, name it update in Instance Option name box, right click again and choose edit in place. In the update movie clip timeline make 3 key frames and assign actions on them;
1st frame action;
STOP. It will wait there till called .
2nd frame action:
Begin Tell Target ("../")
Set Variable: "update" = getProperty("mc",_x)-click
End Tell Target
3rd frame: go to frame 2 and Play