Child Movie Clips

Ok…I have a couple buttons that I want to load movie clips say box1.mc and box2.mc. How would I have “button 1” load box1.mc and when you click on “button 2” it would load box2.mc and have box 1.mc fade out and visa versa? I’m a newbie when it comes to this stuff, so details would be nice :slight_smile: Thanks in advanced.