Expand sub-menus on hover in a menu block I need to show menus expanded in the sidebar. I used the menu blocks to show the submenus. But now the problems is when I hover on the parent menu initially it is not showing the submenus which was appearing before.
And also submenus is expanded only when click the parent menu which then lists all the submenus with expanded.

Please tell me how to show the submenus on hover in menu blocks when the submenus are not expanded
You can use this module Nice Menus. Nice Menus enables drop-down/right/left expandable menus. It uses only CSS for most browsers, with minimal Javascript for IE6. (Version 2 uses the Superfish jQuery plugin for all browsers, with an option to disable JS, and falls back to CSS-only for browsers that can handle it.)


  Three styles/types of menus are currently possible: horizontal, menus drop down; vertical, menus fly to the left; vertical, menus fly to the right. There is a handbook page that provides a list of sites that use Nice menus.