I was wondering how to configure the 770 to share a WiFi connection over BT PAN, or even a BT 3G connection that could be shared over PAN. Is this doable, any hints, links etc

I have a Sony Ericsson M600i that supports surfing over BT PAN, but since I have a free 3G (WCDMA) access with my other cellphone (corporate), it would be cool to share that connection from the 770 to the M600i, or even an active WLAN connection.