Textarea type on one field custom add_meta_box?

i got the solutions,

array( 'shortdesc', 'shortdesc' , 'textarea'),

and add new function for text_area:

function text_area ( $args ) {
global $post;
// adjust data
$args[2] = get_post_meta($post->ID, $args[0], true);
$args[1] = __($args[1], 'fp' );
$label_format="<label for="%1$s">%2$s</label><br />" . '<textarea style="width: 95%%;"  name="%1$s">%3$s</textarea><br /><br />';
return vsprintf( $label_format, $args );
}