I'm look for advice on how to set modify the site's CSS to make the top level navigation items active when a page from the drop down under a top level item is active.

At present, the top level navigation is active when that link has been clicked and the related page is being viewed. We would like the same behaviour when any of the pages from the same item's drop down items has been clicked and related page is bing viewed.

The site is located at: http://saeaustralasia.wildapricot.org

Can anyone suggest the appropriate CSS (and/or javascript) to achieve this?

Thanks, Steve J