Summing a running balance

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SQL-Server

SQL-Server-2008

I have a table AccountReceivable with these columns

ID   ReceiveDate    Ref_No   Account_Code    Account_Name            Details      Debit    Credit 

1    2013-02-19              101             Account Receivable       wama        500

2    2013-02-19              101             Account Receivable       NRA                  200

I want to get the running balance into the balance column like:-

ID  Receiveddate Ref_no Account_Code  Account_Name   Details  Debit  Credit balance

1    2013-02-19          101                         wama      500            500

2    2013-02-19          101             A           NRA              200     300