Yeps, a sys admin could do that. Sure. But we dont want others also to see that website. Is it possible by deleting that entery from the whois database is my question.

No - not without some high level intervention at the registry and seeing as they are in the US under US law, it's not very likely to happen (freedom of speech/press, etc.). You could also set the firewall policy company wide at the network distribution point (where the Internet comes into the facility from the outside). But, that's censorship which I don't support except in rare cases. -- Jonathan