Solution for html source <img="gif_script.php?var..."> ?

Hi there, All my menu items are taken from a database and rendered into GIF files by PHP. To do this I call a script that takes some vars as well. Any client that will view the output html source or views/saves an image will see something like: <IMG SCR="make_gif.php?var=$var&bla=$bla"> I realize that if I was to write the generated gifs to disk I wouldn't have this problem, but I do not want to do this. (Multiple sites * multiple fonts * multiple colors = A LOT ) Does anybody have a nice work around ? Thanx. Matt