Magento / Get gallery images from product id

gistfile1.php

<?php

$backend = Mage::getResourceModel('catalog/product_attribute_backend_media');

$attributeId = Mage::getResourceModel('eav/entity_attribute')->getIdByCode('catalog_product', 'media_gallery');
$container = new Varien_Object(array(
    'attribute' => new Varien_Object(array('id' => $attributeId))
));
$product = new Varien_Object(array(
    'id' => 519,
    'store_id' => Mage::app()->getStore()->getId(),
));

$gallery = $backend->loadGallery($product, $container);