Buttons with Sub-buttons

OK. I’m having a problem making my sub-buttons work inside my movie clip, and I don’t know what to do exactly. For example, I have my main button which is “1” and when you roll over it I’m trying to get 3 buttons to come beneath it. Lets call them 2, 3, 4. It works fine until I roll over 2, 3, or 4. The 1 button just keeps replaying itself from the beginning. Anybody know how to achieve this? This link is basically the effect I’m trying to acheive on the “tour” and “media” buttons.
Thanks in advanced,