Sortable Lists

I'm trying to create sortable lists (unordered lists where the items can be rearranged by the user dragging/dropping them). Scriptaculous includes this functionality, but the latest version doesn't seem to work reliably cross-browser - eg in firefox the items will move when you drag them, but just snap back to their original position - the list wont resort.

Does anyone know of any other Javascripts that will let me do this? Or a tutorial? Or something?

Thanks

EDIT: I figured it out. I had <span>'s inside my <li> tags and apparently Scriptaculous didn't like that.