<?php
/**
 * Single Product Thumbnails
 *
 * @author 		WooThemes
 * @package 	WooCommerce/Templates
 * @version     2.3.0
 */
if ( !defined( 'ABSPATH' ) )
    exit; // Exit if accessed directly

global $post, $product, $woocommerce;

$attachment_ids = $product->get_gallery_attachment_ids();

if ( $attachment_ids ) {
    ?>
    <div class="thumbnails"><?php
        $loop = 0;
        $columns = apply_filters( 'woocommerce_product_thumbnails_columns', 3 );

        foreach ( $attachment_ids as $attachment_id ) {

            $classes = array( 'zoom' );

            if ( $loop == 0 || $loop % $columns == 0 )
                $classes[] = 'first';

            if ( ( $loop + 1 ) % $columns == 0 )
                $classes[] = 'last';

            $image_link = wp_get_attachment_url( $attachment_id );

            if ( !$image_link )
                continue;

            $image = wp_get_attachment_image( $attachment_id, apply_filters( 'single_product_small_thumbnail_size', 'shop_thumbnail' ) );
            $image_class = esc_attr( implode( ' ', $classes ) );
            $image_title = esc_attr( get_the_title( $attachment_id ) );

            echo apply_filters( 'woocommerce_single_product_image_thumbnail_html', sprintf( '<a href="%s" class="%s" title="%s" data-rel="prettyPhoto[product-gallery]">%s</a>', $image_link, $image_class, $image_title, $image ), $attachment_id, $post->ID, $image_class );

            $loop++;
        }
        ?></div>
    <?php
}