note 25473 added to function.header

I have a script that serves images for webpages. The image is accessed using normal img tags in html, and authentication is done in the image php. What I want to do is have it so that when a user right click's on the image and choses save image, the filename listed currently the name of the script, I want to be able to set the filename that it defaults to... any suggestions, I figure it is a header that I should send, I'm doing most of them alread, I just don't know which one. -- http://www.php.net/manual/en/function.header.php http://master.php.net/manage/user-notes.php?action=edit+25473 http://master.php.net/manage/user-notes.php?action=delete+25473 http://master.php.net/manage/user-notes.php?action=reject+25473