Firstly, the demo here http://docs.jquery.com/UI/Accordion does not work for me on any browser I test. I think it is broken.
Secondly, I am using this widget on a <ul> tag where each <li> has another <ul>. It works well BUT if the bottom one is open and you put the mouse on that <ul> tag and then slide it up to the <li> so that it begins to close and then continue sliding up to the next <li> up before it finishes closing, then the next one doesn't open. Seems to me that the 'open' event never happens on the next <li> because the lower one's 'closing' animation didn't yet finish. Is there a fix for this issue? Thank you.