Hi guatemeha,
As I said, this one is a little more tricky as you have to put in the right number for the width of your navigation container. The container only holds the menu topics.
I wrote a tutorial for that on my blog: Adjust the navigation bar
http://www.mouseclick.com/tutorials-2/adjust-the-navigation-bar/
The number you used for the width seems to me to be the complete width of the bar?
Cheers,
Alexander@ http://www.mouseclick.com