Output more than one image per product on list (category page) of Magento.

//get images for product
$product = Mage::getModel('catalog/product')->load($_product->getId());
$helper = Mage::Helper('catalog/image');
foreach ($product->getMediaGalleryImages() as $image) {
    echo "helper('catalog/image')->init($this->getProduct(), 'thumbnail', $image->getFile())->resize(243) . "' />";
}
?>

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