Internet Sharing and Local Network

[mikeyl]

I have the internet sharing working on my touch pro, my question is

How do I force my computer to go on the internet via the internet connection instead of my local ethernet connection?

my computer has a ethernet card that is connected to a local network that does not have internet.

I tether my phone and if i disable the ethernet card, I can surf the web, If i enable the card, the computer attempts to go on the internet via the ethernet card instead of my phone..

how do i force all wan activity to go through phone and all lan activity to go through ethernet?

also i'm using windows xp and bridging the two connections doesn't seem to work