Laptop to 2 different domains

I have a loptop I with Windows 2K Pro that I use at work to login to a Win NT 4.0 Server. At home I have a Windows 2000 Server with a different domain. I would like to be able to switch between the 2 domains from the login screen. I have 2 NIC cardsI can use in the laptop. What is the best way to do this.