I just bought an iPod and figured out how to transfer my songs from LW and synced them to my iPod. Then I think I did something stupid.

I deleted the songs from my LW library. They still show up in my iTunes library but when I sync my iPod it says it can't find the files (because I deleted them). The songs are still on my iPod, thank goodness. Is there anyway to get the files back into the LW library?
Thanks.