help moving stuff from ipod to macbook

ok, so i'm trying to import my music that was from cd's back onto my computer, my problem is, i deleted all my music from my computer so i could just import all the stuff and not have to delete all the duplicates. Now i can't sync it, but if i try to cancel the sync, then senuti doesn't recognize it, or if i quit itunes i have the same problem. if i choose not to sync music it says it will delete the library on the ipod. any suggestons?