Two(2) Computers, IBM Hub, DSL Internet

Need help Please. I have two(2) HP Pavilion Model 304w computers with Windows XP on both. I have a #8242 IBM Ethernet Desktop Hub, Model#008. Right now we have two(2) different Dial-Up Internet Lines in our house. One line is for the wife and the other line is for me. In February (08) we are swithing to DLS. I was told by our ISP that I could hook both computers to a hub and then hook the Hub to the DSL Line and this way I would only have to pay for one(1)DSL Line instead of two(2) DSL Lines. Could someone out there please tell me STEP BY STEP how to do this. A Big Thank You To Whoever Can Help Me On This.