Posting pretty code

[bad_goose]

I've seen a lot of postings in here with code examples that are formatted all nicely, with a fixed-width font and syntax highlighting. How do you do that?

[sid]

[PHP]
//code here...
[/PHP]

(without the underscores) tuns to:

//code here...

[bad_goose]

cool. I'll test it out:

if ($thisworks)
    echo "<h1>sweet!<h1>\nThanks sid!";

nice.

[sid]

if (online(bad_goose)) {
    print "hehehe";
}