.htaccess help? I'm not very Apache-savvy and—embarassed, here—I'm on a hella tight schedule.→[More:]

Most importantly—and easiest—I need to block hotlinking to three images (call 'em untitled1.png, untitled2.png, and untitled3.png). I could probably figure this one out myself without much trouble, but there may be a way to tie it in to the next problem:

I also need to block external referrers to three HTML files (untitled[1..3].html): links from within the domain must resolve just fine; links from without must resolve to the directory's index.html.

It's all hopelessly roundabout and goofy (I've even tricks to prevent right-clicking to save on the aforementioned images); it's for a very large-scale April Fool's prank and we're hoping the apparent paranoia will add versimilitude. (It should also prevent easy spoiling of the joke.)

I feel stupid for asking for something so easily Googleable, but all the tutorials I've found are either impenetrable unless you're already an expert, or too simple to cover anything this labyrinthine. If anyone here knows a trick off the top of his or her head I would be eternally grateful. I will pay in mp3s and cat pictures!