Stored Procedure to Delete Rows and Return Count

I am (unfortunately) using PG 8.4

I have created a simple stored procedure to delete records from a table but
while it deletes the records it does not return the number of rows deleted.

I experimented and searched The Internet, and came up with this solution.

CREATE OR REPLACE FUNCTION testdel(integer) RETURNS bigint AS $$

with d as (delete from foo where id=$1 RETURNING *)

select count(*)

$$ LANGUAGE SQL;

Unfortunately this thinks that DELETE is a syntax error.

I tried the following SQL statement in phpPgAdmin (found in an answer on
stackoverflow.com) This also conforms to my understanding of WITH Queries,
PostgreSQL Documentation 8.4.22

WITH d AS (DELETE FROM foo WHERE id='1' RETURNING *) SELECT count(*);

and the result was a syntax error on the keyword DELETE, as above.

This statement was accepted as working in stackoverflow.com, but doesn't
work for me.

Can someone give me a clue how this can be done and confirm that their
solution has been tested so I know it's my end that has the problem, or
better yet tell me what I'm doing wrong.

Thanks

Dave