Trying to write a function...

Hello,

I'm trying to write a function that add new rows to a table, but I don't
succeed.....
It's something like this:

CREATE FUNCTION f_addrtr (varchar(16),varchar(32)) RETURNS bool AS '
DECLARE
index int4;
BEGIN
index := 'nextval('s_routerid')';
INSERT INTO t_routers VALUES (index, $1, $2);
RETURN 1;
END;'
LANGUAGE 'plpgsql';

What am I doing wrong?

Cheers!

Wim.