sql function can't complie

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SQL-Server-2008R2

Dear All friends

I have faced one problem last four hour's, but can't until find proper solution.

alter function _swap_row_value
()
returns @temp table
(
id int not null,
salary int not null,
name varchar(max) not null,
sex varchar(max) not null
)
as
begin
insert into @temp(salary,name,sex) select t.salary,t.name,t.sex  from top5 t   
update @temp set sex= case sex when 'm' then 'f' when 'f' then 'm'
return;
end;

Error show like this type : Msg 156, Level 15, State 1, Procedure _swap_row_value, Line 14
Incorrect syntax near the keyword 'return'.

structure of table top5

id      salary  Name         sex
1	1000	joginder	m
2	1500	Suresh	        m
3	1200	vikas	        f
4	1700	abiminau	f
5	500	laxman	        f
6	1600	bhushan	        f
7	100	joginder	m
8	150	Suresh	        m
9	12000	vikas	        f
10	110	abiminau	f
11	550	laxman	        f
12	1510	bhushan	        f

plz solve my problem as soon as possible. This type of question asking in MNC .

thanks for Advanced...................