It's not a scripting issue. Whichever web server you're using (IIS, Apache, etc.) needs to be told that "default.html" or whatever document (index.html, home.html, etc.) is a "default document" so that when a URL without a doc name is searched, that file will be pulled up.
If anyone knows of a website that can offer ColdFusion help that isn't controlled by neurotic, pedantic jerks* (stackoverflow.com), please PM me with a link.
* The neurotic, pedantic jerks are not the owners; just the people who are in control of the "popularity contest".