Accordion pane in AJAX Toolkit

Question

Dear all,

I have two accordion panel in my webform.

1. i have one panel in it & initially in open mode
2. i have 3 panels in it & initially closed.

Here If i open any one of panel in second accordion panel
first accordion will be close & If all are in closed mode
then 1st accordion pane will be open.

How to do this?