You have another javascript error on your page that might be causing the issue. This code:
<script type="d1d4b5aec890c59dfde42feb-text/javascript">
Shadowbox.init({
players: ['img', 'html', 'iframe', 'qt', 'wmp', 'swf', 'flv'],
overlayOpacity: 0.8
});
</script>
I think it should be lower case for shadowbox like:
<script type="d1d4b5aec890c59dfde42feb-text/javascript">
shadowbox.init({
players: ['img', 'html', 'iframe', 'qt', 'wmp', 'swf', 'flv'],
overlayOpacity: 0.8
});
</script>
or just try removing it to see if that fixes the problem... If you give me FTP access then I could try.