Find out where code fires from for an ajax form

Hi,

I have a form here: headstudios.com.au/hsfast at the bottom - which is an ajax form. It is linked to my Mailchimp and I am trying to make the text field a text area for the 'Message' field (which would involve modifying the theme files to some extent).

My question is - how can I find the jQuery that gets fired when the form is submitted? Preferrably I would like to do this with Firefox - I have been doing some reading about the debugger but what I would ideally like is to click on the Submit button and see what code gets triggered.

Any input would be much appreciated (and if you could just tell me where the code is that would be great too).

Thanks