ISA server 2000

Hi,

I have a ISA server 2000, which previous configuration was a nic with a internal ip adress range and a dialup connection, and thus via the dialup we were accessing the internet. I recently subscribed for a dsl connec. & installed ics on a comp. with 2 nics. i can ping the isc machine & web pages from isa server but i am unable to browse the net. how do i change isa config to recognize dsl connec?