the Thumbnail Viewer code is what's messing things up. You can just do this to your page to get stuff working again:
Code:
<script type="text/javascript">
(function($){
$(function(){
$("#jMenu").jMenu({
openClick : false,
ulWidth : 'auto',
effects : {
effectSpeedOpen : 150,
effectSpeedClose : 150,
effectTypeOpen : 'slide',
effectTypeClose : 'hide',
effectOpen : 'linear',
effectClose : 'linear'
},
TimeBeforeOpening : 100,
TimeBeforeClosing : 11,
animatedText : false,
paddingLeft: 1 });
});
})(jQuery);
</script>