sync multiple Iphones on same pc

Hi All,

It's my first POST here...

Here's the scenario:

My wife's Iphone is synced to her PC (Itunes).

I want to Sync my Iphone using her PC and Itunes.

I've never pluged my Iphone to my wife's PC yet...

What will happen the first time I plug it in?

I don't want my wife's contact, music and all to be synced to MY IPHONE...

I need help on this !

Thanks in advance...

Marc L