Sortable list offset problem when scrolling in Firefox

Sortable list offset problem when scrolling in Firefox


Hi,
I have a problem with a sortable list in Firefox. When I'm scrolled
down a bit, the helper has an offset of the same height that I'm
scrolled down.
I've seen a coupe of posted about this happening in IE6 or IE7, but
there I don't have the problem. I only have the problem in Firefox.
Could someone point me in the right direction to fix this offset
problem.
Thanks!
Sander