Perhaps this is common knowledge but I just discovered this.

In addition to adding a Flash animation to your Xtreme created website (See the HTML Workbook) you can add a URL link to that animation.

When you create the animation, place an object that will appear in all the frames, a rectangle the size of the animation for example, and add your link to that object.

I have to do some experimenting, but it would seem that it should be possible to create Flash rollover buttons.

Gary