Customer Error Pages
Just upload a file called ".htaccess" without quotes, to the directory that has your web site!

What's in the file?
Here are some examples of the lines you can use in your .htaccess file:

ErrorDocument 404 http://www.askapache.com/

ErrorDocument 404 /error.php


Just upload a file called ".htaccess" without quotes, to the directory that has your web site! That's it!


Link: http://kb.darkscape.net/CustomErrorPages