TG_TABLE_NAME as identifier

Hello everybody! I'm newbie to plpgsql syntax. Can anyone tell where I'm getting wrong?

CREATE OR REPLACE FUNCTION tr_audit() RETURNS TRIGGER AS $tr_audit$
BEGIN
IF (TG_OP = 'UPDATE') THEN
...
NEW.id = nextval(TG_TABLE_NAME || '_id_seq'::regclass);
INSERT INTO TG_TABLE_NAME SELECT NEW.*;
ELSIF (TG_OP = 'INSERT') THEN
...
END IF;

RETURN NULL;
END;
$tr_audit$ LANGUAGE 'plpgsql';

returns

ERROR: syntax error at or near "$1"
LINE 1: INSERT INTO $1 SELECT $2 .*
^
QUERY: INSERT INTO $1 SELECT $2 .*
CONTEXT: SQL statement in PL/PgSQL function "tr_audit" near line 8

I
tried some variants using INSERT INTO '|| TG_TABLE_NAME ||' SELECT
NEW.* and quote_ident(TG_TABLE_NAME) with no luck! Unfortunately
searches on the Net and old threads on this forum didn't help me.

Hope someone can do this!

Thanks in advance,

Tiziano.
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