i didnot made any transaction of withdrawl to bitcoin... actually i added bitcoin traded it for dollars, added a bank account ... and for waiting for bank addition verification i logged out of my account
     next day i logged into my email and get the mail of withdrawl information with ip information
Transaction reference: 530f092e-dda9-4404-86a2-5d3c8b8c44e7
Date: 2013-08-27 22:31:32 GMT
IP: 121.233.121.219

   i have the same password for bitmit.net and i think they are a trusted compay .....
My old password is working .... the person only withdrawn the fund to its btc