Made 20-odd structural changes to the History site, based on the department's response to the IA's review. Everything desired is now accomplished, except that it proves impossible in Cascade to specify a tooltip for a menu item which is different from the menu caption itself. This means we can't gloss acronyms in the menu with their expansions. Still waiting to hear from the dept how they would like to proceed on this issue (expand captions, or leave acronyms unexpanded).