Drag n Drop between 2 sortable lists

I’m trying to implementate a sortable list, where i can drag some object
from and then drop on the other sortable list. The Object dragged from
the first list should not dissapoint from the first list, it should then
be on both lists. I’m using the libraries from script.aculo.us and tried
to do it like the “sortable lists” example. I think, the second list
should be a drop_receiving_element and a sortable_element. Does anybody
has an idea, how to solve this problem?