2CSB unter Joomla 2.5

  <script src="/media/system/js/mootools-core.js" type="text/javascript"></script>
  <script src="/media/system/js/core.js" type="text/javascript"></script>
  <script src="/media/system/js/caption.js" type="text/javascript"></script>
  <script src="/media/widgetkit/js/jquery.js" type="text/javascript"></script>
  <script src="/cache/widgetkit/widgetkit-b6437589.js" type="text/javascript"></script>

URI is not defined: var myURI = new URI();

http://subdomain.domain.de/plugins/content/2clicksocialbuttons/2clicksocialbuttons.js  
line 26