order by question

Hi,All
for example,I have a query as this
select id,product_id from table_name where product_id in
(6,3,4,10,7) order by .....
the results I want to get as bellow:
id................product_id......................
33...............6...................................
40...............6..................................
12...............3....................................
25...............4.................................
10...............4................................
17...............10.................................
43................7...................................

any Idea? thanks

--
Tony Liao