EasyTabs

EasyTabs greatly extends the UI capabilities of the regular SharePoint menu. You can add images, levels and multiple custom CSS classes to obtain just the look you want.

Infowise SharePoint EasyTabs provides the following functionality:

Multi-page user interface for SharePoint sites.
Multi-level menus.
Miltiple menu types:
SharePoint site map providers - Connect EasyTabs to SharePoint navigation provider and replace SharePoint Default menu.
Tabs - Implement server side tabs on your site. Each tab will represent SharePoint web part page. Works with standard SharePoint document library which stores the pages. Implement drop down menu for each tab by creating sub folders in the document library that holds the pages.
Links to external resources - Implement external links drop down by connecting EasyTabs 2.0 to SharePoint links list. drop down menu will create according to links list folder hierarchy.
Custom XML definitions - Create your own menu according to XML definitions.
Supports drop down menu and navigation tree.
Customizable style definition enables you to adapt the menu to the look and feel of your sites, you can even have several different menus on a page, each having a distinct look.
Horizontal or vertical layout.
Easy maintenance not requiring prior knowledge.