Rotating menu, how to stop on rollover?

On the attached swf you’ll see my slowly rotating menu.

Each of the icons around the outside is a button which takes u to a specific page.

When the user rolls over the button I want the menu to stop rotating, and if the user moves the mouse away I want the menu to continue rotating.

Can someone help me with the a/s here? Should I be using mc instead of a button?

TIA