SourceFiles.org - Use the Source, Luke

Module: mod_err.so
Description: This module make it possible to change the error pages.
Configuration:

Read the 'README' file for more information about how to configure a module.

Cfg-data to place in httpd.cfg-file:

[Save/Read] <filename> <error-id>

[Save/Read] 'Save' will read the file and keep it in

                the memory, wich will be faster then read
                the file everytime wich 'Read' does.

 <filename>     The filename to the HTML document.

 <error-id>     The error number to change.

To replace all error 404(file not found) pages your configuration could look something like this:

Save /var/error_pages/404.html 404