1.) you need to take your "HOME" animation and make it a movie clip
..do the same with your "ABOUT" frames and "CONTACT" frames...

you will probably have to cut and paste the frames into new movie clips.

Make sure these 3 movie clips are on the stage with the instance names of
about_mc
home_mc
contact_mc
make sure each of them has a "stop;" action on the frame in the middle on the in/out parts of the animation.

when you get this far...post back..we'll go over step 2