gistfile1

<?php
  // load the fields into an array so we can easily grab any piece we want
  // 0 - image URL
  // 1 - HTML link to node
  // 2 - external link

  //print count($fields);

  foreach ($fields as $id => $field):
    $item[] = $field;
  endforeach;

  // strip HTML from default output
  $imgURL = preg_replace('/<\/?.*?>/','',$item[0]->content);
  $resourceURL = preg_replace('/<a href="(.*?)">.*?<\/a>/','$1',$item[1]->content);

  // banner ad output
  if ($item[2]->content) {
    $imgTag = "<a href='{$item[2]->content}' target='_blank'><img src='$imgURL' alt='' /></a>";
  }
  elseif ($resourceURL) {
    $imgTag = "<a href='$resourceURL' target='_blank'><img src='$imgURL' alt='' /></a>";
  }


?>
<div class="banner-ad">
  <div class="caption">advertisement</div>
  <?php print $imgTag ?>
</div>