At the bottom add some empty lines and then add a new style a for every link after the div style and set the property text-decoration to none.
If you see your page now, the links will not be underlined...
After the a:visited style, add a style for a:hover and set the font-weight property to bold.
Now create a style a.pageOn for the link when you're on that page. Set the font color to the same as your text (= orange for now so it's easy to see the difference from black, blue and purple we have for other text/links)
On your home page:
If you look at your home page, the heading should be orange (not blue/purple anymore).
Go into each topic page and paste the class inside the opening A tag for each topic/page.
So now when I click around my pages, I can tell which page I'm on in the navbar.