Also from this author
When broken links frustrate your site's visitors, a typical 404 page explains what went wrong and provides links that may relate to the visitor's quest. That's good, but now you can do better. With Dean Frickey's custom 404, when something's amiss, pertinent information is sent not only to the visitor, but to the developer—so that, in many cases, the problem can be fixed! A better 404 means never having to say you're sorry.