Lost Admin Account

Hello!
I am having some trouble with our WordPress account.

We have changed webmasters a couple of times, and the last time we did not receive the admin account details back from them. They have since been unresponsive and we desperately need to regain control of the site.

I just want to know if there is a way of finding out the username of the admin and possibly the email attached to it so we can get in touch directly with that person and see if we have better luck retrieving the details.

Thanks a lot!!

The page I need help with: [log in to see the link]