That’s exactly what happened to us today. New jQuery = faster, better, stronger, but ThickBox hasn’t been updated since August 2007 and it looks as though the new JS library got rid of some code/function Thickbox have been built around.
Here’s the way how to deal with it: http://codylindley.com/thickboxforum/comments.php?DiscussionID=1791&page=1#Item_5. As easy as removing the “@” on the 79th line of the thickbox.js, which as of jQuery version 1.3 is deprecated as explained in this post: http://adipalaz.awardspace.com/thickbox_jquery13-en.html.
Cody Lindley: can we have ThickBox 4, please? 
We love ThickBox, we think it makes internet a better nicer place and we would love an update. Extended functionality. Documentation. Support. Maybe even a price..
