Asicminer shares are always bound to the same address the dividends flow to. Except friedcat did change something in the last time.

You have a problem now. Didnt you know that you never should add anything of value to a bitcoin address you dont own? Especially when its only a deposit address. Your shares now are bound to the mtgox address... that address is the owner now. And you cant access it because its not your address.

The only chance i see is if your account is bound to an email. If you send friedcat an email from that email address you can ask him to move the shares to another of YOUR addresses. An address in your own wallet. Preferably not a website wallet since websites with wallets go down left and right.