{{ $sponsor := .sponsor }}

<div class="row">
<h3>Supported By:</h3>
{{ range $parentKey, $parent := .this.Site.Data.sponsors }}
  {{ range $childKey, $child := . }}
    {{ if eq $childKey (lower $sponsor) }}
    <a href="{{ $child.url }}">
      <img class="img img-responsive sponsored-by" src="{{ $child.image }}" />
    </a>
    {{ end }}
  {{ end }}
{{ end }}
</div>