How do you set up a server network card to accept a static IP address?

I'm working with Windows Small Business Server 2003 on a Dell Poweredge 1900. I've manually entered the IP address and preferred and alternate DNS servers. BT suggested I use 255.255.255.0 as the Subnet Mask, and the static IP address they've issued as the Default gateway, but I cannot get a connection. If I switch back to 'Obtain an IP address automatically' I get a connection but the card is generating an IP address of 10.0.0.7. I need to have the card retain the static IP address so I can access the server remotely.
The server has two NICs; one for the external broadband connection (which is the one I am having problems with) and a second which is hooked to our network switch.
I'd really appreciate any advice anyone can give on this. Many thanks.

it seesm that your ADSL Connection through the router or the ADSL modem is generating IP's for your network, the DHCP is enabled on one of them, it's a good situation since you want other clients to access internet through your server , so the NIC hoocked to your switch should have a static IP address , manely 192.168.0.1 , and you start sharing this connection , in this way you will get a dynamic address and a static one , to be able to access your server remotely you need to configure remote access on your 2003 server by adding a licence

So just to clarify - it's the external address that needs to be static, not the internal network address?

In that case you need to get to the router settings, usually by typing 10.0.0.1 or 192.168.1.1 in your IE address bar and enetring the username and password. You'll then have a page that will allow you to enter your static IP that BT should have provided you.

Persoannly though, I've never got this to work without first running the BT set up wizard, getting a connection and then going in and changing the IP address afterwards