I currently have a Mac Pro with dual ethernet ports and will be switching to a new iMac 27". I have two separate networks at work and each one is connected to the Mac Pro via one of the ethernet ports. I've set it up so that switching from one network to the other is as easy as hitting a keyboard combination quick key. My problem is that the new iMac only has a single ethernet port. Is there some splitter that will allow me to have access to the 2 different networks without having to manual switch cables?? Any help would be appreciated.