Ever seen em? Look at my sig, refresh the page and it should be a different sig, cool eh? Well, it's easier then Big Red's mother, it really is to those of us who know.
First - Download here, (in mozilla should open as .txt document)
http://alistapart.com/d/randomizer/rotate.txt
Copy and paste everything in it to note pad and save as rotate.php
Then, get a free web hosting that allows php, 1001 webs is what I use.
Register and all that crap, then make a folder called images.
Upload all of your images and the php file into the folder.
Then copy the link of the .php file. Paste that in your sig and bam your done.
Could've written it better, but lost all my interest after I had put "First -"