(1) Collapses the header and the footer into thin strips at the top and bottom of the page, and redisplays them when you mouse over one of the strips.
(2) Moves the sidebar from the right side of the page to the left side, and auto-hides it as a thin vertical strip at the left edge of the page.
(3) Auto-hides the galleries "filmstrip" in the body of the article, and restores it when you mouse over it