What I am looking to do is create a custom error page. Something so that if a user try's to navigate somewhere that does not exist they get a site error page. Let me give you and example..
http://templatemonster.com/jimmyhoffa.html
or
http://templatemonster.com/browneye.html
Obviously neither of those pages exist but instead of getting the browser's error page they get Template Monster's custom error page. How is this accomplished?