sql 2008 view

I have created the following view
create      view [dbo].[myview_vw]
AS
SELECT            a.vendor_code,
            a.address_name,
            a.contact_phone,
            a.fax_number,
            a.attention_email,
            a.terms_code,
            b.bank_name,
            b.bank_account_num,
            b.aba_number,
            b.account_type
                   
FROM        mymaserap a,  mybankdet b
where         a .vendor_code = b.vendor_code

GO

this works fine but what I want to say is what is a Savings Account and what is A cheque account based on b. account_type

alter     view [dbo].[myview_vw]
AS
SELECT            a.vendor_code,
            a.address_name,
            a.contact_phone,
            a.fax_number,
            a.attention_email,
            a.terms_code,
            b.bank_name,
            b.bank_account_num,
            b.aba_number,
            b.account_type = case b.account_type
                                         when 0 then 'Savings Account'
                                         when 1 then 'Cheque Account'
                            end      
FROM        mymaserap a,  mybankdet b
where         a .vendor_code = b.vendor_code

GO

I am getting syntax error near '='
I should be able to put in a case here.
Would welcome some advice