How to highlight an navigation button after laoded an external swf

Hello guys,

I have a question after reading and successfully follow this tutorial

But i would like to make additional animation for the navigation base on the tutorial.

How do i make an highlight button ,after load a particular page?
For example when loaded page section 2, the button will will highlight the “section 2” button on the navigation.

Actually i open a tread b4 at flash 8 section, here is the link

but it seems not much reply;(

Any help and guide will be really appreciate.