I HAVE A 12OGB CLASSIC IPOD THAT I BOUGHT OFF MY FREIND BECAUSE MINE BROKE. I STILL HAVE ALL MY SONGS IN MY ITUNES LIBRARY ON MY LAPTOP THAT I WANT TO TRANSFER TO MY NEW USE 120GB CLASSIC IPOD BUT I WANT THE SONGS THAT ON THE IPOD NOT TO ERASE WHEN i ADD THE SONGS FROM THE LAPTOP. WHAT SHOULD I DO TO KEEP THE SONGS FROM ERASING SINCE THEY ARE NOT IN MY ITUNE LIBRARY