Sergey Biryukov

Restores and enforces the bundled jQuery in the admin if your theme registers a newer version which may not be compatible with WordPress yet.
You can try this plugin <a href="http://wpdevel.wordpress.com/2011/02/10/if-your-menus-or-widgets-screens-broke/" rel="nofollow ugc">if your menus or widgets screens broke</a>.

Restore Bundled jQuery

Restores and enforces the bundled jQuery in the admin.

yonisink

Create a WordPress menu (up to three levels) with the WP appearances built-in menu builder and convert it to a nice responsive dropdown using template tags.
Choose your colors, and whether you want a hover or click (click will be permanent on responsive break due to mobile devices’ use of hover as a “pre-click”).

Sinking Dropdowns WordPress

Convert default WordPress menu to a responsive hover/click dropdown menu.

Restore Bundled jQuery vs Sinking Dropdowns WordPress