I was importing some code from static HTML pages into a client’s home grown CMS system this morning. When I reviewed the site in Firefox with Firebug running, I was seeing the error:

b.support not defined

The site uses Fancybox to display the window overlays within the site so I had to step through the code and to find out what broke during the migration. Turns out it was a stupid mistake on my part.

Make sure that you include a reference to the jquery library before you load fancybox.

<script type="text/javascript" src="/js/jquery.min.js"></script>
<script type="text/javascript" src="/js/Fancybox.js"></script>