interface drag n drop bug in jquery 1.2.1 (work well with 1.1.2)

With jquery 1.1.2, drag n drop works well (try in ie6, in firefox no problem), see at http://interface.eyecon.ro/demos/drop.html (both ie and ff work well).

if you change jquery version to 1.2.1, in ff is no problem too, but in ie, you only can drag once for one element. You can't drag again after once. Just drop jquery.js to 1.2.1 version to test it.

I don't know why, but I have to downgrade to 1.1.2 version to use drag and drop. You can view at there or see the attachment.

Thx