The navigation bar in a website is one of the most used sections of a website. Your visitors use it in order to go to order sections and come back to the home page.
This is why you have to make sure for the navigation menu to be easy to use and not confusing for your visitors. The second thing you would have to go over in navigation menus is their design.
The important thing is not to overdo it. Animated menus might seem annoying if you make them too complicated. Simple is neat and you should think about that when designing your website, especially the navigation bar.
jQuery CSS Animated Navigation Menu Tutorials