How to block users from accessing AOL from office computers

Hello,

The office has a DSL connection that is shared with the four users with a Netgear FVS318 router. This router allows me to block sites based on keyword or domain name and it will also block specified outbound ports. The computers are XP & 2000 on a W2K AD domain. The users are not very technical and I don't think the fix needs to be 'bulletproof'. It's more of just a deterrent, if someone is able to bypass these measures, the logs will show it and the problem will be taken care of. My first thought is to block the sites: aol.com & anything that the messenger uses as well as the ports it would normally use. I don't really know what these are right now so anything you guys can tell me would be great. To start off, I'm going to block login.oscar.aol.com, which should prevent anyone from authenticating with the AOL servers.
Suggestions?

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
[url]https://arstechnica.com/civis/viewtopic.php?f=20&t=696951[/url]
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Thank you.