Removing one movie clip in and replacing with another

I have various movie clips that play when a button is clicked.
My first movie clip (instance name is “MCABOUT”) which plays on the press of the button called “about”. I have another movie clip (instance name is “MCPORTFOLIO”) which plays when another button called “portfolio” is pressed. I have a stop() applied within each movie clip so that they stop playing once they reach their end frames. My question is: How do I get the “ABOUT” movie clip to disappear from the stage when I click the button for “PORTFOLIO” and how do I apply this to make any additional movie clips disappear from the stage once another button is clicked so that the movie clip attached to that button plays (in other words, whatever movie clip is presently on the stage disappears)?