Save a closing Accordion Pane's data in my DB

Hi

I'm using an Ajax Accordion and what I want to do is when a panel is closed (by opening another panel) I want to save the closing panel's data in a SQL table.  So far I've been unable to find how to do this online.  I don't want to stick a save button on each panel or the page if I can help it.  I'd prefer the saving to happen without the user explicitly initiating it.

Thanks

FSR