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<?php
//Show metabox on specific page
$post_id = '';
if ( isset( $_GET['post'] ) ) {
	$post_id = $_GET['post'];
}
if ( 44 == $post_id || defined( 'DOING_AJAX' ) && DOING_AJAX ) { // your page id
	$meta_boxes[] = array(
		 'title' => 'Оформление страницы'
		,'id' => $prefix_mmbg.'background'
		,'pages' => array( 'page' )
		,'fields' => array(
			array(
				 'name' => 'Выберите картинку для фона страницы'
				,'id' => $prefix_mmbg . 'url'
				,'type' => 'image_advanced'
			),
		)
	);
}

return $meta_boxes;
?>