my friend has a tibook 400 mhz and needs to connect to the internet via a usb modem(gps style) - ericsson f221m. I have the book recognize the usb>serial adapter no problem but I can't figure out how to get the book to recognize the modem. It doesn't appear in the modem list - is there a way to have the book look for the modem? Or do I need to install a driver?