Sam,
When you added the drop down menu's up top it causes javascript errors to fire when I browse your site.. It's all over the place, since I'm a developer I have the settings turned on to pop up all errors.. Most browers just put a little error icon on the bottom of the screen, indicating there's an error with the code..
Anyway... I had some extra time today at work and found the code that was causing it..
//HV Menu- by Ger Versluis (http://www.burmees.nl/)
//Submitted to Dynamic Drive (http://www.dynamicdrive.com)
//Visit http://www.dynamicdrive.com for this script and more
function Go()
</SCRIPT>
<SCRIPT SRC="http://samanna.net/java/menu_var.js" type="text/javascript"></SCRIPT>
If you can locate the red section above in your files and change it to
function Go(){}
It should correct the issue..