OK...
I have your mod installed and working correctly. I sent you PM's with a couple typos for your instructions.
Here is a working example:
http://www.systemskins.com/sscart/home.php
Feel free to constantly hit your browsers refresh, I have 375+ products getting randomized there. :P
Now... If I want to add that script inside a category (like say Xbox 360) and randomize only Xbox 360 products in that category only, how would I do that?