RokNavMenu by RocketTheme comes with elegant pre-installed menu themes. You can build extended drop down menues with multilevels. RokNavMenu allows also administrator overrides and plugins, so you can also combine other extensions, like RocketTheme's RokBox, or realize your favorite menu item design, by adding your own parameters and options. The download is free. RokNavMenu is native to Joomla 2.5 and Joomla 3.0. It works also in Joomla 1.5.