This patch adds jQuery Treeview functionality (http://bassistance.de/jquery-plugins/jquery-plugin-treeview/) to the communities and collections views in XMLUI Reference theme.
This patch is intended to improve the UI, especially when navigating larger numbers of communities and collections.
For more detailed information, please see http://developer.edina.ac.uk/projects/jorumdspace/wiki/Collection_Browse_tree
To see the collapsible tree in action, visit the Jorum customised version of DSpace 1.5.2 at http://open.jorum.ac.uk
Note that this functionality hasn't been added to any of the other sample XMLUI themes or to the JSPUI.