WPAlchemy: Uploader with preview (like Featured image)

I am using WPAlchemy to generated custom meta boxes in the WP backend.

I was wondering when using the Media uploader if there’s a way to show the uploaded image in the meta box (like in the built-in Featured image metabox). By default only the link is entered in the input.

Here’s the code for the upload input:

<?php global $wpalchemy_media_access; ?>
<div class="my_meta_control"> 

  <label>Uploader</label>
  <?php $mb->the_field('download_url'); ?>
  <?php $wpalchemy_media_access->setGroupName('img-n'. $mb->get_the_index())->setInsertButtonLabel('Insert'); ?>

  <p>
    <?php echo $wpalchemy_media_access->getField(array('name' => $mb->get_the_name(), 'value' => $mb->get_the_value())); ?>
    <?php echo $wpalchemy_media_access->getButton(); ?>
  </p>

</div>