filename header?

I want to make a download script so if you called it via download.php3?id=1 it would query an SQL database for the file location and send it to the user. that all works fine, but I want to have it so that the filename the person saves it as is what the name of the file is, since right now it saves it as download.php3?id=1. Is there some sort of filename header that I can use? If possible, send a cc: of all replys to vrillusions@mail.com (in netscape, simply click the 'Reply All' button and your set) -- Todd Eddy vrillusions@mail.com http://www.vrillusions.com/