The most recent version of jQuery (1.3 and now 1.3.1) breaks backwards compatibility on an old selector that Thickbox 3.1 depends on. This is an easy fix, which you can download here.

With Jquery, creating user-friendly "delayed" drop-down menus is easy. Doing so without alienating non-javascript users is more difficult. This shows you how to create a delayed menu system while staying accessible.