Currently Being ModeratedJan 20, 2013 5:25 PM (in response to hatfield1)
The iphone will simply miror the selected content of the computer to which it is synced.
When you sync to your new computer, it will replace the content on your iphone with the selected content of your new computer.
This is why you copy everything from the old computer to the new one first. you then select whatever you like and sync.
Currently Being ModeratedJan 22, 2013 3:17 AM (in response to hatfield1)
See this http://support.apple.com/kb/HT4527
Also, follow the steps given here...