For my company's product catalog, I'm looking to make a floating window with the catalog's index on it that stays with you as you scroll down. Imagine a two page spread where the page on the right is much smaller and holds its position on your screen as you scroll through, so you always have a quick way to navigate without adding bulk to each individual page. Is this possible? If not, I would settle for an "index" button on every page that pops a little window up when you click it. I know it's possible to make something hidden, and its visibility is tied to another button, but it seems like it can only show things on the page itself, but I would much prefer a tiny popup window off to the side of the page.