Hi guys

I currently have 10 child pages which each contain one main image and text.

I then have the main parent page, which acts as a 'contents page'.

I currently have this code on the main parent page...

  <ul class="treatments-list h3">
      <?php wp_list_pages('title_li=&child_of='.$post->ID=15); ?>
  </ul>

This gets all the titles for these child pages and lists them, however, I would like to add an image thumbnail at the start of each of these lists, how can I do this?

Thanks in advance.