I've attempted to add a JavaScript widget to this page:

The widget code is:
<div id="nav_stillinger"></div>
<script src="https://tjenester.nav.no/stillinger/widget?sort=akt&amp;rpp=50&amp;p=0&amp;l2=63218&amp;rv=al" type="text/javascript"></script>
The widget works when I add it to an empty HTML-document, so I guess it's something wrong with the HTML or conflicting JavaScript-code. Any ideas how to fix it would be appreciated.

Firebug says:
HierarchyRequestError: Node cannot be inserted at the specified point in the hierarchy
Line 11