Something like this should work :
$args = array ( 'post_type' => array( 'post', 'attachment'), 'category' => ARTICLE_CATID );
$query = new WP_Query( $args );
Something like this should work :
$args = array ( 'post_type' => array( 'post', 'attachment'), 'category' => ARTICLE_CATID );
$query = new WP_Query( $args );