Sprite Glitch/rollOver Sticking

Yep. You can do that too. Just make the text parts of your movies into separate movie clips, and have an empty movieclip that you will use as a placeholder. Put the placeholder mc down where you want the text to come in, and use attachMovie to swap them out when you mouseover. Be sure you give your placeholder an instance name so that you can refer to it.

This page should explain it nicely for you.