The jquery multiselect widget is now available to drupal by using these two projects:
http://drupal.org/project/jquery_multiselect [3]
http://drupal.org/project/fancy_multiselect [4]
For more on the jquery ui multiselect http://quasipartikel.at/multiselect/ [5]
Links
[1] https://dominiquedecooman.com/blog-topics/jquery-0
[2] https://dominiquedecooman.com/blog-topics/modules
[3] http://drupal.org/project/jquery_multiselect
[4] http://drupal.org/project/fancy_multiselect
[5] http://quasipartikel.at/multiselect/