How do I transfer my iTunes library to my iPod?

Last year my mom knocked a can of diet coke onto my Macbook Pro and fried it completely. A year later I finally had the money to fix it. The hard drive was actually spared, and when I opened Firefox the tabs I had open when the computer got doused in liquid popped up! Everything was the same on my computer as the day it died. But apparently my iPod and iTunes decided not to get along...I couldn't sync the two without erasing my iTunes library. I have songs that I have purchased in my library that I do not want to lose. Is there a way to get the two to sync up without destroying the library on my computer?