$_company
$_firstname
$_lastname
$_address1
$_address2
$_city
$_state
$_postal
$_country
$_phone
$_fax
$_email
__construct()
set_company( $str)
get_company()
set_firstname( $str)
get_firstname()
set_lastname( $str)
get_lastname()
set_address1( $str)
get_address1()
set_address2( $str)
get_address2()
set_city( $str)
get_city()
set_state( $str)
get_state()
set_postal( $str)
get_postal()
set_country( $str)
get_country()
set_phone( $str)
get_phone()
set_fax( $str)
get_fax()
set_email( $str)
get_email()
is_valid()
from_array( $params, $prefix)
to_array( $prefix)