(Blush). Thanks David.

Create a single button for the mouse off state. You cannot use the old PNGs because the new button needs to have editable text set to Center Justify.

Group the text and the button shape.

Copy the button, select the MouseOver layer in the Page & Layer Gallery, and Edit > Paste > Paste in Place. Make sure both layers are visible.

Make your changes to reflect the MouseOver state.

Select the MouseOff layer. Marquee select the button. The status bar should indicate two objects on two layers.

Arrange > Apply Soft Group.

Open the Website Properties menu from the Infobar and go to the far right of the fly out menu. Create Navigation Bar Tool.

In the Navigation Bar Properties menu, check Site Navigation Bar.

Click the Pop-Up Menu Style button and set the parameters for the sub menu.

Press Help in this menu (or any menu) for more information.