issue with SELECT settval(..);

Hi,

I would like to auto increment my sequence when i'm going to insert a new
record into my table.

for that i wanted to use :

insert into immense.statususer (statususer_id, statususer_type) values
(SELECT nextval( 'statususer_statususer_id_seq' ),'customer');

however, i get an error message in pgAdmin III, as following :
ERROR: syntax error at or near "SELECT" at character 168

i do not under because if I run SELECT nextval(
'statususer_statususer_id_seq' ) alone, it works perfectly and increment the
sequence.
moreover, everything regarding the table is correct. so where is the problem
?

thanks a lot,

--
Alain
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Windows XP SP2
PostgreSQL 8.1.4
Apache 2.0.58
PHP 5