This page has embedded next and prev anchors. That's why you see "Next"
and "Prev" menu entries above.
Click on the bottom menu items, starting with About. Then "Next" to
Test sibling flex menu to see how number of sections affects the display.
Sections are different for each page and so are defined in the page source. Pages
are the same for every page in the NextPrev thread, and so are defined with a script,
ScirptsFlexMenusPages.js. That way adding a new page to the thread only requires
changing one thing, the script.