Button over state on different pages of site

Hi Guys,

I have a flash submenu for my site, and I am trying to figure out how to keep the button in the over state (and inactive) for the particular page that the viewer is on.

For example, if my submenu is: About Us, Resources, and Contact, and the viewer is on the Resources page, then that button would be in the over state and would be inactive. When the user goes to the About Us page, then the About Us button would be in the over state and inactive and the Resources page would again be active.

I have seen this on here many times, but cannot figure out the easiest way to do this (other than creating an individual .swf with this effect for each submenu page). Thanks for your help guys, this newbie appreciates it!