Trigger Audit Help

I have the following I have adapted from a web example, the problem I have is that I need to store both the new and old value for the updates, in additionI also want to add to the audit table, recordid, name etc from the original table. Any help would be good

USE [GeminiSQL_v8]
GO
/****** Object:  Trigger [dbo].[Audit_Trigger]    Script Date: 09/08/2010 16:11:45 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER TRIGGER [dbo].[Audit_Trigger]
ON [dbo].[Cashbook]
FOR UPDATE,DELETE
AS
Declare @OldMessage varchar(200)

IF (SELECT COUNT(*) FROM inserted) > 0
      begin
            set @OldMessage = (SELECT
            (case
            when update(Date)
            then deleted.Date
            end) as Date,
            (case when update(Credit)
            then deleted.Credit
            end) as Credit from deleted
            inner join Cashbook
            on deleted.Reference=Cashbook.Reference
            FOR XML AUTO)
      end
else
      BEGIN
            SET @OldMessage = (SELECT Date ,Credit
            from deleted
            FOR XML AUTO)
end

insert into Audit(Type, TableName, NewValue) values (1, 'Customer', @OldMessage)