Infinite Scrolling

Infinite Scrolling

So I've found a ton of examples of this online, but none have been related to what I'm hoping to do.  I'm just trying to make it so that when I get near the bottom of the page, it automatically loads a block of HTML code (so you can't reach the bottom of the page).  This HTML code loaded will be the same no matter what.  All of the examples so far have been loading previous WordPress pages, so I haven't figured out how to just load a constant block of HTML each time.  Any help would be greatly appreciated, thanks!