In-page Navigation

Pull out all headings for the current page to show them as a section listing, similar to page contents in Wikipedia [_example_](http://en.wikipedia.org/wiki/ISO/IEC_8859-1).

I have some reservations about this pushing down the main content. One thing I'd like to try is to have it shown by request, as a pulldown from the fixed header. (Currently that header is not fixed in place for a good reason, but I've had in mind to build interactive features into it an this is a good candidate.)

It's possible there will be some confusion between this contents and the full-pamflet contents that appear at the bottom of each page. How can this be logically resolved? Would it make much more sense to have the current page's section content's be nested into the main contents? If so, then that has to go up top, and significantly push down the content. It can not be interactively displayed because the browser's "find in page" feature should always be able to find the names of other pages, IMO.