Hide info apache

[Alex1]

how to hide info example to me it goes that
Not Found

The requested URL /test/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.3 (Debian) PHP/5.2.0-8+etch15 Server at site.com Port 80

i want it goes that

Not Found

The requested URL /test/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.