How to Block Specific IP Address (YouTube)

This is a follow-up question to one I posted earlier this week. I want to block YouTube (and a handful of other sites) from my stepson's new iMac and it was suggested I try/use Leopard's "Parental Control" feature.
I tried that, but the problem is, when he attempts to visit the site, a warning page pops up informing him Parental Controls have blocked the site, then gives him the option to log in as the administrator or to email the admin for access...and that's pretty much the worst thing that could happen. He has serious Obsessive Compulsive Disorder (OCD) and it HUGELY upsets him that he can't guess the Admin password.
Soooooo...can anyone suggest an alternative means of blocking a specific IP address that does so WITHOUT serving up a "Contact the Administrator" message? Someone has suggested blocking the IP address via the network router, but I haven't a clue how to do that.
Any help?
Thanks.

Something else you might look at to see if it is suitable for you is to use the DNS servers from www.opendns.com (on your router for example) and set up an account on there, then exclude the sites you don't want accessed - either by the names of the sites OR by the category of site they are.
What that does is NOT actually "blocking the site" as such, what it does is when the workstation wants to resolve the hostname into an IP address, OpenDNS will fail the request. The user will see a browser page from OpenDNS saying that the site was blocked by the network administrator - you can change the wording and even add an icon if you like.
If the user doesn't have admin access to the workstation (whereby they could change the DNS server locally to your ISP's normal DNS, which presumably doesn't offer this sort of lookup-filtering) and they don't know the IP address(es) of the sites they want to access - obviously if the workstation doesn't have to go to a DNS to look the address up, it doesn't matter whether the DNS is blocking the lookup for you - this works well.
There's more information on www.opendns.com - as I said maybe it won't be appropriate for you, but if it is, it's pretty easy to set up and to administer.

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