I saw what you did on the site - it looks good -
Well, to get more out of the skin you will need to adjust the padding on the left and right of the menu. I see you used a solid strip colour whereas when I made that skin originally, it had 5 colours to make it look like multi colour menus.
If you download firebug for mozilla and mouse over the menu, you can see where the padding is set left and right. By reducing this you can squeeze in more menu items.
I will get Paul to look at the file tomorrow and tell you exactly where you need to change it to make it fit.