plpgsql and for with integer loopvar error

I have a single column result that I want to loop through using an
index. I also want to jump ahead in the result using the index (below:
i:=i+cluster_cnt-1;) . However, I'm getting the following error.

ERROR: syntax error at or near "SELECT" at character 9
CONTEXT: PL/pgSQL function "gets_nooky" line 14 at for with integer
loopvar

Here is my function ...

CREATE FUNCTION gets_nooky() returns numeric AS
'
DECLARE
i integer;
gt1cnt record;
gt1 record;
cluster record;
cluster_cnt integer;
slocus integer;
minmax record;

BEGIN
SELECT INTO gt1 * FROM cgt1;
SELECT count(*) INTO gt1cnt FROM cgt1;

FOR i IN 1 .. SELECT count(*) FROM cgt1
LOOP

SELECT INTO cluster DISTINCT qry
FROM seeds2
WHERE seed IN (
SELECT qry
FROM seeds2
WHERE seed=gt1.seed[i]);

slocus := i;

SELECT INTO minmax min(qle) AS mqle, max(que) AS mque
FROM seeds2
WHERE seed IN (SELECT * FROM cluster);

UPDATE locus
SET locus=slocus, lle=minmax.mqle, lue=minmax.mque
WHERE id IN (
SELECT *
FROM cluster
);

SELECT INTO cluster_cnt count(*) FROM cluster;
i:=i+cluster_cnt-1;
DELETE FROM cluster;

END LOOP;

return i;

END;
'
language 'plpgsql';

Any help is much appreciated!

Thanks,
Ari