Insert the following snippet into your page's HTML code, in the position where the ads should appear:
<style type="text/css">
#jobs-widget-holder { width:200px; padding:10px; margin:20px; border:1px #ccccff solid; }
#jobs-widget-list,
#jobs-widget-list li p { padding:0; margin:0; }
#jobs-widget-list li { list-style:none; margin-bottom:5px; }
</style>
<div id="jobs-widget-holder">
<ul id="jobs-widget-list"></ul>
<a href="http://jobs.netnatives.co.uk/" id="jobs-widget-link">More jobs</a>
</div>
<script type="text/javascript" src="http://jobs.netnatives.co.uk/widgets/jobsWidget.js"></script>
<script type="text/javascript" src="http://jobs.netnatives.co.uk/widgets/"></script>