Okay, so there may be a simple answer to this question but I do not know it, so please help me with this. I just bought a new Macbook and I want to make it wireless, at the moment I have a PC in the other room that is running Windows Vista, it is hooked up to a cable modem via Ethernet cable. Now I was thinking of investing in the Airport Express from Apple, and this is where I get confused, if my cable modem only has one ethernet jack, how do I connect it to the Airport Express without losing the internet connection on my PC? Please help me with this because I am completely lost.