You could get this type of errors in case the url of a <script src="...url..."></script>
does not return javascript, but some other content (html)
I checked the page, but all scripts with src actually do seem to return javascript. With a bit more digging, it seems that this eval code triggers the error message:
artNoStyleAdding(document)
It looks like it is coming from this script:
<script type="text/javascript">if (Drupal.jsEnabled) {$(document).ready(function(){ window.setTimeout("artNoStyleAdding(document)", 2000);});}</script>
That's the last but one script in the head of the document.
Apperantly you forgot to declare and code the artNoStyleAdding
function, whatever it is supposed to do.