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<?php
  $img = get_field('mainphoto');
  $imgurl = wp_get_attachment_image_src($img, 'shopmain');
  $imgfullurl = wp_get_attachment_image_src($img, 'full');
  if($imgurl){ ?>
    <a href="<?php echo $imgfullurl[0]; ?>" rel="lightbox">
    <img class="ro" src="<?php echo $imgurl[0]; ?>" alt="">
    </a>
<?php } else { ?>
  <img src="<?php bloginfo('template_url'); ?>/image/bankdetail/img_dummy.jpg" /＞
<?php } ?>＞