Stored Procdure To Update Two Tables While In Detailsview

I am using a stored procedure to update data while in detailsview.
I am having a rough time. Dont know why this wont work
thanks a lot
heres my code
ALTER PROCEDURE UpdateCustomerInfo
    ( @CustomerID as INT,
 @LName as varchar(50),
 @FName as varchar(50),
 @Dept as varchar(50)=NULL,
 @PhoneType as varchar(50)=NULL,
 @OfficeType as varchar(50) = NULL,
 @Ext as Int=NULL,
 @BridgeExt as int=NULL,
 @Workstation as varchar(50)=NULL,
 @OldPrinters as varchar(50)=NULL,
 @NewPrinters as varchar(50)=NULL,
 @PhoneImg as varchar(50)=NULL,
 @OfficeImg as varchar(50)=NULL,
 @Complete as Bit=NULL,
 @FaxModel as varchar(50)=NULL,
 @FaxNumber as varchar(50)=NULL,
 @ConfPhone as varchar(50)=NULL,
 @ConfExt as varchar(50)=NULL,
 @ReutersDacsId as Varchar(50)=NULL,
 @Bloomberg as Varchar(50)=NULL,
 @NewFloor as Int=NULL,
 @OldFloor as Int=NULL
 )

AS



    UPDATE CustomerInfo SET LName = @LName, FName = @FName, Dept = @Dept, PhoneType = @PhoneType, Ext = @Ext, BridgeExt = @BridgeExt, Workstation = @Workstation, OldPrinters = @OldPrinters, NewPrinters = @NewPrinters, OfficeImg = @OfficeImg, PhoneImg = @PhoneImg, Complete = @Complete Where CustomerId = @CustomerId
   

    UPDATE Extras SET CustomerID = @CustomerID, FaxModel=@FaxModel, FaxNumber=@FaxNumber, ConfPhone=@ConfPhone, ConfExt=@ConfExt, ReutersDacsId=@ReutersDacsId, Bloomberg=@Bloomberg where CustomerID = @CustomerID
   
    RETURN