how to restore my i-pod touch?

i plugged my i-pod touch into my friends computer to charge it n walked away...when i came back all my songs were erased and hers were on it. is there anything i can do to get my songs back?? and why would that of happened??

Pic2011-02-11T05:55:03Z

As a default setting when you plug your ipod into a computer it automatically syncs the songs that are on the computers music library to your ipod. All you should have to do is plug it in to your computer, wait a little bit and you should get all your songs back on your ipod. You can also disable this option to sync automatically. I think it's in the window where you can look at the stats of your ipod.