Added nav items to NA site.

Hey guys,

A placeholder nav for the NA site. We don't have all the elements yet, but this way they're at least parallel. 
![image](https://f.cloud.github.com/assets/6336303/2227686/8e94007a-9ac9-11e3-8b70-5d0f667e14c3.png)

Thx!
R