IE API Key problem

Hi,

I have generated a key and everything works fine in Firefox. When I try
to view the site I've setup in IE, I get an error saying:

The Google Maps API key used on this web site was registered for a
different website. You can generate a new key for this web site at
http://www.google.com/apis/maps

I don't understand what's going on as everything is fine on FF. This
happens with the test code from the API page and in my website
(http://themis.cursci.co.uk/google/test.html)

Any help would be greatly appreciated.