Ok, how do I debug THIS?

I'm getting:
ERROR: parse error at or near "IF"
WARNING: plpgsql: ERROR during compile of networks_trigger_log near line
206
$

but the function is:

$ wc -l z
147 z
$ head z
CREATE OR REPLACE FUNCTION networks_trigger_log () RETURNS "trigger"
AS 'DECLARE
record_fields_old text;
record_values_old text;
record_fields_new text;
record_values_new text;
query_string_old text;
query_string_new text;
BEGIN
query_string_old := ''INSERT INTO networks_log'';
$

How do I find my stupidity?
$ psql
Welcome to psql 7.3.2, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help on internal slash commands
\g or terminate with semicolon to execute query
\q to quit

ler=# select version();
version
---------------------------------------------------------------------
PostgreSQL 7.3.2 on i386-portbld-freebsd4.7, compiled by GCC 2.95.4
(1 row)

ler=#

--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 972-414-9812 E-Mail: ler(at)lerctr(dot)org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749