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Nice Menus enables dropdown expandable menus for an unlimited number of menus. Uses CSS (and Javascript for IE).

Three styles/types of menus are currently possible: horizontal (menus drop down); vertical (menus drop to the left); vertical (menus drop to the right).

Menu items come out of the normal menu tree. Nice menus are blocks which can be placed wherever normal blocks can be placed. The module comes with a simple colour scheme which can be fully overriden with the user's normal stylesheet. Several CSS override examples are provided in the included README.txt file.

More advanced functionality will only work with 4.7, and there is no ongoing 4.6 development planned.

The link to the demo site shows an old version with bugs which have sinced been fixed. See my site to see an example customization of drop-down menus using a more recent version of nice menus.