How to use 2 gateways and 1 network card?

I have a Windows 2003 server with 1 network card (10.0.0.3). I also have 2 different internet providers on 2 gateways(10.0.0.1 and 10.0.0.2). The server has 10.0.0.1 as its gateway. I have a static external ip address on 10.0.0.2. If I send a ping to the static external address, how can I get the server to reply?