You can report potential hackers by getting their IP's from your firewall & go to http://www.dnsstuff.com/ & put their IP into the box marked "IPWHOIS Lookup" & press the whois button.
When you have done that, you should be on a page giving details of their connection. You can at this point get their ISP's email address.
Write an email to them abuse@blahblah.com explaining the time, date of the attack & the email address or even better, attach the log of the attack from your firewall to the email.
Hope this helps everyone here
dikki