Collapsible table of contents
The table of contents in the sidebar may get quite large. It would be good to make this collapsible, i.e. show only one or two levels by default.
Example of large toc: http://admin.exist-db.org:44455/exist/apps/gsk/works/106.xml
In ib-proofing the toc should be collapsible as well, though I could not get the code provided by the designer to work.