Highlight current scene in table of contents

I created a persistent symbol for a table of contents and each item in the table links to a scene using javascript. This works fine except I don’t know how to highlight the current scene in the table of contents so a user can see which screen they are on. Any easy way to achieve this?

Have a look at this.

PageButtons.hype.zip (35.8 KB)

nav.hype.zip (17.2 KB)

This is what I have Mark

Sorry I just updated my post with an example…