Messy Casts, Is there a better way?

I have a table with the following, in part:

contract_start date
contract_term int (term in MONTHS)

I want to calculate the contract end date. I came up with:
CREATE FUNCTION "get_contract_end" (integer) RETURNS date AS 'SELECT
cast(contract_start + cast(cast(contract_term as text) || '' month'' as
interval) as date)
FROM circuit
WHERE internal_id = $1;' LANGUAGE 'sql';

Is there a better way?

--
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