I have a page where i sometimes remove stuff from the database and therefore also pages that google has in it's index. Say http://mysite.com/user/userpage.aspx?userid=12345
If i remove the user with userid 12345 i want to return a 404 page that says "Page not found" so that the page is removed from the index. I could of course just return something like "The user is not found" but i guess Google would appriciate if i return a 404. Anyone have any tip how to do this?