Script returns an image?

I am trying to make a call from one page (pure HTML) that would include a tag as follows: <img src=http://mydomain.com/returnimage.php?var1=value1&var2=value2 width="100" height="50" alt="Description"> My question is how to get the php script to return the proper headers as well as the image to the client. This will be used for tracking when certain copyrighted images (actually blueprints) are accessed, and by whom by making some db entries when called, then returning the image. The image is static and is not dynamically generated based on any of the values in the uri. So far all I get are broken images. I'm guessing that it has to do with the headers... -- P