You didn't use JQuery to write the navigation menu? Believe that when you see these excellent jquery navigation menus, you will regret that you didn't apply jquery to your Web development earlier. JQuery can basically replace Flash to implement the cool navigation menu used by the Web, learn the following 14 tutorials and apply them to your website project.
codename Pufferfish Demo
sliding Menu using JQuery Demo
smooth animated menu with JQuery Demo
Drop down Menu with JQuery and CSS Demo
Lavalamp for jQuery lovers Demo
Create Vimeo like top navigation Demo
jQuery convertion Garagedoor Effect Demo
Designing the Digg Header Demo
animated Drop down Menu with JQuery Demo
jQuery CSS Drop down Menu Demo
Easy to style jQuery Drop down Menu Tutorial Demo
Create A nice looking floating menu with jquery easing Demo
JQuery Horizontal ToolTips Menu Tutorials Demo
jQUery flipping Menu Tutorial Demo