jQuery Multi Level horizontal CSS Menu 介绍
This is a multi-level horizontal CSS menu created using a regular nested HTML
list only as far as markup, then transformed into a fully functional drop down
menu using CSS and a touch of jQuery. A fade effect is enabled by default, and
sub menus will automatically readjust themselves horizontally if too close to
the window’s right edge.
jQuery Multi Level horizontal CSS Menu 官网
http://www.dynamicdrive.com/style/csslibrary/item/jquery_multi_level_css_menu_horizontal_blue/