Writing a user defined function

Hello,
 I am trying to code a simple udf in postgres. How do I write sql commands
into pl/sql ? The foll. code doesnt work.

CREATE OR REPLACE FUNCTION udf()
RETURNS integer AS $$
BEGIN
for i in 1..2000 loop
  for j in 1...10000 loop
  end loop;
  begin work;
  declare cust scroll cursor for select * from tpcd.customer;
  FETCH FORWARD 5 FROM cust;
end loop;
CLOSE cust;
COMMIT work;
return 1;
end;
$$ LANGUAGE plpgsql;

select udf();

thanks,
Suresh
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