Is it possible to set an HTML page to be my desktop wallpaper in OS X? I can do this in Windows XP. Occaisonally, I'll write a little Flash app that does something, and I'll place it in an html page, then use the html for my wallpaper. It's also fun just to have an animated wallpaper every now and then. Is this possible with OS X as-is, or would I need to get some 3rd party app to do something like that?