Are you serious j.miner? Take a look at J Livingston code, it's way simpler.
I just would change the having clause for a where clause (to filter the information before grouping it).
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2