WSUS and Windows Genuine Advantage

I have a test lab network which is isolated from the internet. I have setup a WSUS server to update the test machines and things have gone well. I want my machines to upgrade to IE 7, but since my network is not connected to the internet the IE7 update fails because it cannot contact the mothership, i.e. (no pun intended) Microsoft. By not connecting to the Micorsoft the WGA failes to validate my valid window OS’s.

Done anyone know a way around this?

Thanks

Mitch