Separate Sortable Helper?

Separate Sortable Helper?


The default sortable implementation adds the sortable helper as an
element inside the parent of the sortable items. In my particular case
this list is contained in a sidebar whose overflow-y css property is
set to auto, and overflow-x set to hidden. Unfortunately this means
that the helper can't be dragged outside the container without
disappearing.
Ideally I'd prefer to specify a sortable helper that's contained in a
separate 'layer' or div at the top level of the page. This means it
can be dragged around a page without disappearing. Is there a simple
way to do this or possibly a better solution to the problem I'm
experiencing?