Stored procedures

Hi,
I am having problems with a stored procedure (plpgsql) that takes in a
value and returns a record set.
my code is as follow:

create function pg_clientRec(text) setof record as
'
declare
customerID ALIAS $1;
rec record;

begin
select into rec * from troubletickets where custID = customerID;
return rec;
end
'
language 'plpgsql';

I am calling the procedure as follows:

select clientRec('tmpg60');

I am getting the following error:

ERROR:  set-valued function called in context that cannot accept a set
CONTEXT:  PL/
pgSQL function "pg_clientRec" while casting return value to function's r
eturn type

What am I doing wrong????

regards

Uzo