So I'm working on a new book and I was wondering what could be done with it technically speaking. I know how to insert images, but would it be posible to have animated gifs running in a book as well? My first attempt failed. Took some simple smiley.gif and resized the single images of which it consists to a power of two. Didn't seem to work, ended up with a plain white square inside the book. Anyone ever got a gif running?

Also, what about custom music or other soundfiles while reading a book, wasn't there a tutorial on this once?