TG_TABLE_NAME as identifier - Mailing list pgsql-sql

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.