IE6 Killing Horizontal NavBar

I’m new to CSS and I found a cool NavBar set-up here (https://www.web-development-blog.com/archives/css-navigation-bar-with-stylish-web20-elements/) so I took a chance.

Because I’m new, when I tried to get it working, there were problems. A few tweaks here and a few tweaks there, and it appeared correctly. Or so I thought. Internet Explorer does not make the nav bar extended the cull container’s length.

I’m using 426 pixels as a width now and it looks fine in Firefox and Safari, but it doesn’t make the whole container in IE6. I tried using 100% as the width, but it goes past the edge.

Any help is much appreciated. I’m not sure where to start troubleshooting. So any suggestion would be greatly appreciated.

Screenshots:

Here is the link:
https://olsenebright.com/dev/

Here is a screenshot I took in case you are not running IE6.

IE6:
https://aycu06.webshots.com/image/13605/2000292288417439523_rs.jpg