Is there a program to automagically switch your networks from the GPRS, to a different one when connecting the hotsync cable.

This is so when I have the hotsync cable, I can use the Softtick PPP on my Treo 600, but when disconnected, the normal GPRS one.

Considering that I pay for GPRS/kilobyte, it is a great time saver for syncing email etc.

Anything that will prevent the manual intervention will be great. any suggestions?