Prevent 404 Error

[W0nkey]

I have written a php cms that allows users to create a virtual name for each menu entry eg. home.html instead of things like index.php?page=1. The ErrorDocument is then pointing to a php script which is responsible for finding the correct content and presenting it to the user. I noticed the 404 error is actually being sent to the client, followed by the correct content. It doesn't appear to cause any problems, but is there anyway I can prevent this 404 being sent? Or, perhaps I need to look at a different url rewriting scheme ...

Thanks.