There is something going on with Javascript on your site.
Using FF Web Developer Tools, viewing the Javascript running on your site, the tooltip.js file errors out in this way:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
www.w3.org/1999/xhtml" xml:lang="en-gb" lang="en-gb" dir="ltr">
<head>
<title>404 - Error: 404</title>
<link rel="stylesheet" href="/templates/system/css/error.css" type="text/css" />
</head>
<body>
<div align="center">
<div id="outline">
<div id="errorboxoutline">
<div id="errorboxheader">404 - Article #0 not found</div>
<div id="errorboxbody">
<p><strong>You may not be able to visit this page because of:</strong></p>
<ol>
<li>an <strong>out-of-date bookmark/favourite</strong></li>
<li>a search engine that has an <strong>out-of-date listing for this site</strong></li>
<li>a <strong>mistyped address</strong></li>
<li>you have <strong>no access</strong> to this page</li>
<li>The requested resource was not found.</li>
<li>An error has occurred while processing your request.</li>
</ol>
<p><strong>Please try one of the following pages:</strong></p>
<p>
<ul>
<li><a href="/index.php" title="Go to the Home Page">Home Page</a></li>
</ul>
</p>
<p>If difficulties persist, please contact the System Administrator of this site.</p>
<div id="techinfo">
<p>Article #0 not found</p>
<p>
</p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
I'm not sure what "Article #0" means - but perhaps you are asking the component to display content in the listing that does not exist?
