Insert Data Into Tables

Need some help. In my db I created 3 tables. 1- tblClient 2- tblCategories 3- tblClient_Cat ( colums: 1) client_id 2) cat_id).
What I'm trying to do is create a sp to insert data from a web form into the tblClient and into the tblCat using the same sp. this is all I got so far.

CREATE PROCEDURE [usp_insetClient]
(
@ClientName varchar(25),
@Contact varchar(100),
@Tel char(13),
@Fax char(13),
@WebAdd varchar (250),
@email varchar(250),
@CatID int
)
 AS
Begin
insert tblClient(Client_name,client_contact,Lient_tel,client_fax,client_webadd,client_email)
values(@ClientName,@Contact,@Tel,@Fax,@WebAdd,@email)

select @@identity

insert tblclient_cat(cat_id,client_id)
values(@Catid,@@identity)

(I tried to use this  sp but didnot work)

as you can see I need help inserting the client_id just created by the db into the tblclient_cat since the cat_id is passed from the web form

Thanks

Ernesto