MS Virtual PC 2007 internet via USB modem on host.

I’m using Microsoft Virtual PC 2007 on my XP laptop. I am using USB Modem to connect to the Internet.
I have Ubuntu 10.04 and Windows Server 2003 VMs.

Can my virtual PCs connect to the internet via my USB internet modem?
How do I configure that?

I used to be able to connect them when I had ADSL Internet modem, but need to travel around, so i switched to a portable internet connection with this USB Modem.

Thank you in advance!