in the image details, add a link that passes the image name as a querystring variable:
<a href="prodDetails.php?image=myimage.jpg"> Buy this image</a>
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.