Hi Ali - MouseDown a third button state and to create this is simple. Create a new layer that is above MouseOver and call it MouseDown. MouseDown will be the state that identifies the page and that appears briefly when you click a button.

To accomplish what you want is also simple. Don't create a traditional nav bar. Create individual buttons. You can arrange them any way you want. I've done this on my personal site www.gwpriester.com except the buttons look like a normal nav bar but the colors are different. And each button has a mouse down state.

But your buttons could all be different shapes. There is no restriction for what you can do. Think outside the nav bar.