CSS question with current pages of a wordpress theme

If you go to:

http://www.herstockreport.com

I have the navigation set up to where whatever page you are on the word is highlighted in a background-colored box. This works for all of my pages on the top navigation bar except for the blog page. Of course this is where my client’s blog will show. Does anyone have a quick solution to fix this problem or is there nothing I can do about that???

s4int