There is a bug in the demo/docs here: http://docs.jquery.com/UI/Accordion
In this block, the H3's don't properly close tags. Causes issues with IE, and might reduce some of the noise on the lists from bogus problems. <div id="accordion"> <h3><a href="#">First header</a><h3> <div>First content</div> <h3><a href="#">Second header</a><h3> <div>Second content</div> </div> Matt