{{ if ne .Site.Params.flattr "" }}
<script id='header-contact-flattr'>
  (function(id){
    var s = document.getElementById(id);
    var f = document.createElement('iframe');
    f.src = '//api.flattr.com/button/view/?uid={{ .Site.Params.flattr }}&button=compact&url={{ .Site.BaseURL }}&title={{ .Site.Title }}';
    f.title = 'Flattr';
    f.height = 20;
    f.width = 110;
    f.style.borderWidth = 0;
    s.parentNode.insertBefore(f, s);
  })('header-contact-flattr');
</script>
{{ end }}