If you want to create menus using jQuery, here is a good list of plugins and ideas to consider.
NavDock jQuery Plugin 1.2
"NavDock is a jQuery plugin that transforms your menu into a dock style menu."
"Group objects with similar functionality into one button.
Save space and give users more interaction. Move your mouse over the share button to see what I mean."
jMenu : Horizontal navigations with unlimited dropdown sub-menus
"Menu is a jQuery plugin that enables us to create horizontal navigations with unlimited sub-menus.
Besides jQuery, it also requires jQuery UI and supports all the effects of this library (like fadeIn or slideDown).
The markup of the menu is pretty clean as it makes use of nested lists.
The look and feel of the output is set in a CSS file so updating it without touching the JS code is possible."
"With this script you can make nice and interactive drop down menus. The
advantage of this script is that it not only gives you the ability to
make list drop down menu. You can also use a div as drop down element."
jQuery and CSS3 Awesome Slide Down Box Menu
"we will create a unique sliding box navigation. The idea is to make a
box with the menu item slide out, while a thumbnail pops up. We will
also include a submenu box with further links for some of the menu
items. The submenu will slide to the left or to the right depending on
which menu item we are hovering."
Apple Navigation with CSS3
"Apple is known for very clean design and if you have been to their
website in the last few years you’ve seen their primary navigation. It’s
a staple of the apple website and today I wanted to take a crack at
recreating the Apple navigation using CSS3 techniques."