How to delete songs off iphone 4 while its is synced to more than one computer?

I have an iphone 4. I had it synced to a laptop but it broke so i synced it to a different one. All of my music isn't on the new laptop, so when I right click to delete songs from my iphone it says i cant delete them because it is synced to more than one computer. Any suggestions???|||If you have a compatible printer then you can print them directly from your iPhone. Otherwise, you'd have to upload them to your computer. There's a list of compatible printers on this page:





http://support.apple.com/kb/ht4356|||Mo solution is PC Suite for iPhone, here is the offical website you get it for free, FYI, You need jailbreak your device first.





http://91.pandaapp.com/pcsuite/|||use CopyTrans .. its exactly what u need .