Not bad, I would suggest adding the command to the script commands window though (see documentation).
I would also use another method of detecting commands in messages (Search for CookieRevised's post on detecting commands as it uses a RegExp and allows you to grab paramaters as well)
You also have 62 array entries, but the random number generator goes upto 65 meaning you will get errors every so often
Overwise this is quite a good script even if I have heard some of them before. Probably better than the first thing I posted (Whatever it was
)
* Spunky goes to find first code posted on forum
/ 
