A basic and properly structured HTML/CSS drop down menu can serve you just as well. In fact, it may make your site appear more responsive to not use animations and instantly display the menu instead.

In this practical React tutorial, you'll learn how to build an animated multi-level dropdown menu from scratch. Inspired by modern interfaces like Facebook, this project covers the essentials of ...

I almost have this figured out. My implementation of Suckerfish dropdown menus on Firefox works reasonably well. And nearly works on IE6 (what I'm targetting). The problem that I am running into ...