Trying to sync music onto my iPhone without deleting music already on my phone?

SO
I have a couple of CDs on my phone and the computer I use for itunes has a broken CD port so I borrowed my friends laptop and put the songs on my phone.
Well now I downloaded music onto MY computer and everytime I try to sync my new music the dang thing keeps telling me that by syncing these new songs onto my phone, it'll delete anything already on my iphone.
This is very frustrating.
Help.
How do I keep my music AND add my new stuff?
10 points to whoever helps me fix this problem please please

Try to select the new song in your pc and select copy, then paste it into your iphone folder. It should works.

Don't sync. In iTunes, go to Preferences->Devices and check the "Prevent iPods etc from syncing automatically" option. Then you can just drag songs to your phone.

You can only keep the music currently on there AND add new music if you use your friend's laptop to do it, otherwise all you can do is either redownload all the music that's on your phone on YOUR computer or you'll just have to deal with losing the music currently on there.

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