This is a nice plugin, but there is no proper documentation on how to use it. The author says to go to the jquery site to see html examples, yet when you copy the html from the jquery site into your own wordpress widget, nothing shows up. Thankfully, another user gives a hint on how to get started.
The jquery website shows that to display the accordion, you need
Yet, to get it to work on wordpress, you need to change it to a class, like this:
As I said, nice plugin but seriously, you need to clarify things a bit more. It wouldnt hurt to give precise documentation on how to use a plugin you wrote.