Scarlar Value Function Syntax error (probably)

Righto Experts

Pigeon steps.....Am trying to set myself up my first written Scarlar Function and I keep getting error messeges.

The current one is :
Msg 102, Level 15, State 1, Procedure FiscalWk, Line 48
Incorrect syntax near '@FsWks'.

The script is meant to work out Fiscal week and year utilising a set date (defined from the given @startMonth variable)

Now I'm sure there is a more efficient way of processing this information (pointers are always greatly recived :) ) but I am seeking help in just getting this function to work please.

Thanks in advance

Create function [dbo].[FiscalWk] (@startMonth varchar(2), @myDate datetime) 
returns int 
as  
begin  
declare @dy1 datetime  
declare @dynm int 
declare @year int
declare @dtadj int 
declare @Fsyr int
declare @FsWks int
declare @mnth int
 
--Gets mnth from declared Mydate
Set @mnth = datepart(month,@mydate)
--Gets yr from declared mydate
Set @year = datepart(year, @myDate)
--Works out Fiscal Year
Set @Fsyr = Case 
when @mnth = 1 then @year-1 
else @year
End
--gets 1st date of fiscal year from mydate and start month from delcaration in controlling table (MainCli)
Set @dy1 = convert(datetime,@year + @startMonth + '01',103) 
-- gets day number of 1st day of year ie 1 = Monday 
Set @dynm = datepart(dw,@dy1)
-- works out integer to as Monday = 1st day of fiscal year then that would be correct, but if it was a Tuesday then that would be 6 days after 
--the 1st week of a year
 
Set @dtadj = Case 
When @dynm = 1 then 0
When @dynm = 2 then 6
When @dynm = 3 then 5
When @dynm = 4 then 4
When @dynm = 5 then 3
When @dynm = 6 then 2
When @dynm = 7 then 1
End
 
Set @FsWks = (Round((((Datediff(day,@dy1,@mydate)-dtadj)/7)+2),2))+@Fsyr
return @FsWks

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