syncing with another Itunes library without erasing my burned CDs

Installed Itunes on my second computer. When I dock the Ipod shuffle a message appears:
"the ipod "------'s ipod is synced with another itunes library. do you want to erase this ipod and sync with this i tunes library? an ipod can be synced with only one itunes library at a time. erasing and syncing replaces the contents of this ipod with the contents of this itunes library"
press "erase and sync" or "cancel"
my problem: i don't want my ipod shuffle's contents erased because i have a lot of contents from cds i burned. these songs from the cds are not in the library! but they're all in the library of the other computer. now i can't even buy songs because ipod is not synced. please help!