One NIC, Need to service LAN & Connect to WWW 4 Exchange & Internet

Guys,

I have a SBS server 2k3 which currently has one NIC. I have set this with a static and is servicing the LAN. I also have a ADSL broadband connection which i wish to use to service the exchange part & internet side of things. How would you go about this?

Previously the other chap had the server in the switch along with the broadband, which then gave the server a IP and all the other machines of this(3) which did work but very slowly. The reason for change is the broadband hardware has blown and we now are using a SWEEX router…i have tried to use the router to SNMP over to the Server IP to give connection but no success…

Help is much appreciated.

Alex