hopefully, the ip address of your computer isn't visable on the internet so no externel dns sever has ever heard of you, and if your using an address reserved for internel networks, all you'll get is a dns error.
More than likely your accessing the internet through a gateway that masks your box's ip and makes all requests look like they come from the gateways address.
The only way to get people from outside your network to 'visit' your page is by using a client like dynip, which is a free trial for 30 days(last i checked).
this way you can register a name with them and have people type the name you've chosen into their browsers and dynip re-directs them to your computer. this usually works unless the firewall blocks the client's port.
Warning: your job could be in danger doing this, admins don't like users running un-autherized servers on their networks. its a real bad security risk.
