Am i screwed? :S *help*

[oscargarza88]

hey,
i have an ipod as u know and i have like 1 G on music on it but i had to form at my computer as u guys know so i now nly have the songs in the ipod not in the computer and when i wat to update my song on to the ipod that stupid program itunes tells u that how i dont have all the songd anymore the program thinkg im in a new computer so it tellm me it has to erase all the songs i have on th eipod and just put on the ones i have which i dont think its worth it because i have borrowed cds in the ipod which is hard to get again and all that
so if anyone knows a way to put songs on it without erasing the old ones pleallse tell me anything helps alot.
thanks
if got any question please ask or if i didnt make myself clear