1. upload jquery.js, thickbox.js and thickbox.css to "uploads/thickbox"

2. In the the top of your main template place:

<head>
<script type="text/javascript" src="http://yoursite.com/uploads/thickbox/jquery.js"></script>
<script type="text/javascript" src="http://yoursite.com/uploads/thickbox/thickbox.js"></script>
<link rel="stylesheet" href="http://yoursite.com/uploads/thickbox/thickbox.css" type="text/css" media="screen" />
</head>

3. Use the included final_default.txt as a guide for your own final_default template in the autos module

Done, now you should see Thickbox popup windows for your Additional photos :)
