Sliding Menu : How to highlight selected button

Implemeting the wicked sliding menu code into a site.

Can someone show me how I can make a button stay highlighted after they have clicked on it. (i.e. the button is a different colour once it has been selected and then turns back to the original when another button is pressed).

I am not using flash buttons by movieclips with the code to make them work as buttons so I can get a nice mouseover / mouseout fade in and out.

Help you Flash gurus!