How do I figure out what email account this Google Analytics code is attached to?

A client has google analytics code set up on their site. There's at least a dozen people who could have set up the account. So I'm trying to figure out who can log in to see the reports. Looking at the urchin.js script, I don't see an account number or any other reference (and even if I did, I don't know how I'd match that with an email address). How do I figure out what google account is tracking this site?