Jquery accordion plugin not working with IE7

Jquery accordion plugin not working with IE7

I've been trying to implement an accordion script in conjunction with prettyPhoto, a lightbox alternative, and although it works fine in Firefox & Chrome, IE is of course, not happy, and my site degrades horribly!

Please help me debug this one. Thanks alot.

Reference url: http://www.vincentcimo.com/ieindex.html