XF 1.2 a little navtab alteration help.

[Helixion]

Hey, I'm wondering how I can change my current navigation (picture 1) to look more like picture 2 / 3 and get rid of what's in picture 4 (there's a weird gradiant that appears between the blocks, and the right side is too thick.

Here are working examples

http://cyrodiil.net
http://bestinslot.org