Migrating the following function from 8.3.9 to 9.1.7 throws the error:

SELECT easy_pay(606,1);
ERROR: syntax error at or near "."
LINE 1: SELECT user.esbalance < amount
^
QUERY: SELECT user.esbalance < amount
CONTEXT: PL/pgSQL function "easy_pay" line 19 at IF

Code:
CREATE OR REPLACE FUNCTION public.easy_pay(integer, integer)
 RETURNS integer
 LANGUAGE plpgsql
AS $function$DECLARE
  user_id ALIAS FOR $1;
  amount ALIAS FOR $2;
  user record;
  mg record;
  newbalance float;
BEGIN
  SELECT INTO user es.balance as esbalance
              from
                  easy_users es
              where
                  es.usid = user_id;

  IF NOT FOUND THEN
    RAISE EXCEPTION 'Cannot find user';
    return -2;
  END IF;

  IF user.esbalance < amount THEN
        return -1;
  END IF;
  newbalance     := user.esbalance - amount;
  UPDATE easy_users SET balance = newbalance
                  WHERE usid = user_id;  
  return 1;
END;$function$
Language 'plpgsql' is already installed in the database..
Any help will be appreciated!