Highlight active link table row

Hi,
I’ve two frames in my page. The left frame is navigation and the right side is content. The links on left navigation is something like this

<a href="…/document.htm#page_04" target=“mainFrame”>Section 1.1 Definition</a>

My problem is I want to highlight the table row on left side navigation to get the idea that which link is currently activated. There are around 15 rows on left navigation. After each click, only highlight the active links row. How to do that.

thanks in advance.:look: