Spry validation not working in ie

Hi,

I have spry validation setup to validate a contact form and it works fine in firefox, chrome, safari and opera, but wont work at all in any version of internet explorer.

You can see the form in question here.

http://www.users.on.net/~nova/luxury-home-builders-south-australia/home-builder-south-australia-contact.html

Anyone know if this is a common issue with spry validation and if so, is there a workaround?

I should add that I am running windows 7 professional 64bit, not that this should make much difference.

It does work in IE9 not but not 8, 7. and 6