Here's a guide. (a well written one imho)
Basically you need to setup an Access List and deny any traffic that is destined for www.orkut.com
If you have a dns server properly configured on the router, Cisco IOS will resolve orkut.com into an IP Address on the fly.
IOS resolves the DNS name when you create the ACL and stores the IP address in the running and startup config. The router would have to send a DNS request for every single packet being processed by the ACL in order to do "on the fly" DNS resolution.
The article you posted mentions that behavior and that is why they suggest using nslookup to see all of the IPs in use at any given time for a domain name. The downside to doing this is that IP addresses to change sometimes so the ACL's can become out of date.
I have followed the instrction as you have given, i configured on my cisco 2600 router but it blocks all the other websites also, internet did not work.So i would request you please suggest me a right way with the command details.
Please see this below command which i had give in to my router,
# ip name- server 126.96.36.199 188.8.131.52 (we have given our isp dns)
#access-list 101 deny tcp any host www.orkut.com eq www
#access-list 101 permit tcp any any eq www
#interface fasteethernt 0/1 (My primary link interface)
#ip access-group 101 out (we had tried both OUT and IN )
Did we make any mistake, pl reply soon.