Adobe portfolio: Indication of the page that's currently being viewed

Hello, I have a question that I hope someone can answer:

How do I indicate the page title that's currently being viewed? For example with a bolder version or underscore. Let's say I'm at my homepage, and I have a gallery called 'Works'. When I'm on the homepage, how can I let the text "Homepage" stay bold, but disappear once I click on for example "About"? (and then it's the "about" button getting highlighted?

I'm using Safari.