[Design with CSS 3784] button states

I am designing a new website for someone, but in the meantime I have to make a few changes in the existing site. 

The first link is what their pages look like now. http://panafricanacupuncture.org/index.html

The second link is a new page I made. http://panafricanacupuncture.org/mexico2013.html

The third link is an alternate version of the new page. http://panafricanacupuncture.org/mexico2013.html. There is also a question mark "?" at the top of the page, just to the left of the white border. I do not see this in the source code. 

The CSS is here: http://panafricanacupuncture.org/screen.css 

If you look at the navbar, you can see that the button for PROGRESS TO DATE is in the Down state. I did a Save As and added a new <li> for the new button, so I figured that was the cause. When I looked at the CSS, I could not see what to change, in order to make the MEXICO button display the Down state. 

Next, I took the Index page, and made the changes again. Now, the Down state does not appear for the Mexico page, nor the Progress to Date page. 

What am I overlooking? 

Thanks, 

Nicky 

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