I guess I should explain my joke...
http://localhost will always point at your own computer. In my case, it works, because I'm running Apache and working on the program locally. In your case, unless you're running a webserver, it won't.
Nerd Jokes
No, this would be a nerd joke:
First Atom: I think I lost an electron!
Second Atom: Are you sure?
First Atom: I'm positive!!!
One of the best pun-style jokes ever thought up.