ehynds/jquery-ui-multiselect-widget — pull request #315 by aerichmond (2012-10-09 17:43:25+00:00)
Title: Added collapsible optgroups and custom checkbox (full/partial/none) optgroups

Feel free to merge any or some of the changes I have made. For large (lots of data) dropdowns I found the collapsing and checkbox of optgroups much more user friendly.

andy