for what i think you are trying to achieve.. do this.
give each movie clip a unique instance name.. then at the end of each movie tell it to stop and then call the other movie by instance name and tell it to play. do that for however many movies you need..
first and last frame of each movie should be blank with the stop command. or learn how to load and unload movie clips.


stop();
_root.mv1.gotoAndPlay(2);