Hello ntm,
I found this in the source code:
<script type='text/javascript' src='https://www.geocaching-blogbuch.de/wp-content/plugins/podpress/js/podpress.js?ver=3.5.1'></script>
<script type='text/javascript' src='https://www.geocaching-blogbuch.de/wp-content/plugins/podpress/js/podpress_admin.js?ver=3.5.1'></script>
<script type='text/javascript' src='https://www.geocaching-blogbuch.de/wp-content/plugins/podpress/js/jquery/jquery-1.4.2.min.js?ver=3.5.1'></script>
<script type='text/javascript' src='https://www.geocaching-blogbuch.de/wp-content/plugins/podpress/js/jquery/podpress_jquery_init.js?ver=3.5.1'></script>
<script type='text/javascript' src='https://www.geocaching-blogbuch.de/wp-content/plugins/podpress/js/jquery/jquery-ui-1.8.5.accordion_dialog.min.js?ver=3.5.1'></script>