Joining Function - Query

CREATE FUNCTION dbo.fn_copdmailinglist(@list_ varchar(60))
RETURNS @copdmailinglist TABLE
(
list_ varchar(60) ,
title_ varchar(255) ,
desc_ varchar(255),
message_id int ,
txt varchar(255) ,
cnt int ,
cnt_txt varchar(255)
)

--Returns a result set that lists all the copds
AS
BEGIN
WITH ListManager.dbo.[List Copd](list_ , title_ , message_id , txt , cnt , cnt_txt ) AS
(select @list_ , gmc.name_, osc.message_id , txt , cnt , cnt_txt from ListManager.dbo.[Open statisticscopd]('') osc
left outer join ListManager.dbo.get_mailingidcopd_('') gmc
on gmc.name_ = osc.title_
where list_ = @list_
)

-- copy the required columns to the result of the function
INSERT @copdmailinglist
SELECT list_ , title_ , message_id , txt , cnt , cnt_txt
FROM ListManager.dbo.[List Copd]
RETURN
END
GO

i m getting error that Incorrect syntax near the keyword 'WITH'.

can anyone tell me how to join functions in sql?

thanks.