Sorry for the late response... I was on vacation for about a week and couldn't get to fixing this. What I will say is that the list is tested and works for Firefox 3, IE 7, and, apparently, Firefox 2.0.0.16 on the mac. Since I don't have Firefox 2 installed, can anyone tell me what errors are produced in Firefox's error console (should be available under the Tools menu) when you try to move things around in the list?
Thanks and sorry for the inconvenience.