how to drag in a scrollable div

how to drag in a scrollable div


hi,
i search for a solution for dragging into a scrolling div. the div is
set to overflow: scroll and the scroll option of draggable is set to
true.
if i now drag an item into the bottom area of my scrollable div...
nothing happens... i cant't position my item in the hidden area, which
i should reach when the scrolling would be enabled at that time.
if i drag at the bottom of the window, the document scrollbar
appears...
but i want the scroll function on MY div, not on THE BODY...
anybody an idea how to realise this?
best regards m
cologne