Ah! OK. Now I understand what you want to know. The way that I would create a Mouse Down effect is to simply create a third button that either had no links (so it didn't change when you moused over it) or left the button the way it was (as far as links go so you still get the mouse over effect) and just change the mouse off state for that particular button for that particular page. And there you go. You have your 3rd state. Maybe a little fiddly, but it gets you what you want.

Eric

[Edit: Hmm...on re-read of that, Perhaps I didn't provide enough detail. Give me a few and I'll repost with more detail.]