Using button to change MCs

If I have 5 buttons, and one movieclip, is there a way I can have each button call a picture, and have that picture fade in over the picture that is currently up there?

so if the swf starts with a picture in the picture section (or MC), which corresponds to button 1, and I click button 2, picture 2 should fade in over picture 1. If I click button 3, picture 3 fades in over picture 2.

But then if I cluck on button 1, picture will fade in over picture 3.

I think it is swapping depts or something. Anyone know if this is easy?

Thanks