Keep menu on top of the site using sticky plug-in


#1

I figured out how to let the jquery.sticky.js plug in works on my testsite, but when the navbar stops all site content goes over the menu, how to get the navbar on top of everything as on this site (http://www.guilhermechagas.com) , some layering or something?
Thanks for your help!
http://marcelwagenaar.nl/test/