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.
项目主页：http://www.dynamicdrive.com/style/csslibrary/item/jquery_multi_level_css_menu_horizontal_blue/
来自:开源中国社区
