Guitar Center's cool Black Friday shop online uses jQuery

I figured this was jQuery, and sure enough:

<script type="text/javascript"> 
    var GB_ROOT_DIR = "/greybox/";
</script> 
<script type="text/javascript" src="/greybox/AJS.js"></script> 
<script type="text/javascript" src="/greybox/gb_scripts.js"></script> 
<link href="/greybox/gb_styles.css" rel="stylesheet" type="text/css" /> 
<script type="text/javascript" src="/includes/header.js"></script> 
<script src="/js/jquery-1.2.6.min.js" type="text/javascript"></script>