internet connection sharing?

Hi I am a newbie running SuSE 8.1 and Win on my desktop at home. I have a USB ADSL internet connection and a network card. My g/f has a laptop running only Win. What do I have to do to enable the connection to be shared by her machine when I an in SuSE (which is whenever Im not playing games ;))? We have done it in Win so we can physically connect. I'm afraid I don't know enough about networking in Linux yet, so helpful hints gratefully appreciated. Andy