You know how when you make a directory without a index file that it just lists the files like here (http://www.sonicfighters.com/images/). Is there a way to add text to that directory page like where it says index of or apache such and such?

You really should just add a blank index file, or have files with no index file redirect to a 503 error page.

I've seen it done before using PHP. You can customize the page to have the look and feel you want (what information you want the server to disclose).