Michael..

The best way is to build a single HTML page with links to your sponsors sites as well as POTD (picture of the day) programs and email collection boxes.

Once you have that page built name it something simple like error.html and upload it to your domains root.

Then put the following in your htaccess file:

ErrorDocument 400 /error.html
ErrorDocument 403 /error.html
ErrorDocument 404 /error.html
ErrorDocument 500 /error.html
ErrorDocument 501 /error.html

Regards,

Lee