Foreign Key Problem

I'm using PostgreSQL 7.4, and I have two tables, which I created as follows:

CREATE TABLE needlestyle (
       needle_style_id     SERIAL,
       needle_style_desc    varchar(50) NULL,
       needle_style_lud     timestamp NULL,
       PRIMARY KEY (needle_style_id)
);

CREATE TABLE needles (
       needles_id          SERIAL,
       needle_style_id     int NULL,
       needle_mm            decimal(5,2) NULL,
       needle_length        varchar(20) NULL,
       needle_lud           timestamp NULL,
       PRIMARY KEY (needles_id),
       FOREIGN KEY (needles_id)
                             REFERENCES accessory,
       FOREIGN KEY (needle_style_id)
                             REFERENCES needlestyle
);


I filled the needlestyle table with three records.  Then I tried to 
run the following insert via phpPgAdmin and got the following error 
message:
ERROR:  insert or update on table "needles" violates foreign key constraint "$1"


In statement:
INSERT INTO "needles" ("needles_id", "needle_style_id", "needle_mm", 
"needle_length", "needle_lud") VALUES 
(nextval('public.needles_needles_id_seq'::text), '1', '2.25', '24"', 
NULL)
What could be the problem?

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