Okay well, I was adding some artwork to some of my ipod video because there are sevral of songs that I did not buy from itunes. And at first I was confused because when I put some of the artwork it didnt show up for some stupid reason so I followed this person's idea (which was person from apple.com dicussions board)

And I did all that, right..I thought it would work and all but instead it DELETED ALL MY ARTWORK!! Because a window did pop up asking if they could and I was like alright probably its part of the process. But no, I was a idiot and listened to that person, NOW all my artwork that I had on ipod is GONE!!! But see it still shows up on itunes but not my ipod..is there a way I can get it back?! also when I tried to re-do the whole steps above it gave me this message "Unknown Error occurred (-50).." but i forgot the rest...any help is great!

It's on iTunes but not your iPod? I would try resetting the iPod, then allowing iTunes to automatically update the iPod, and copying everything over again (automatically).

If I reset it will it delete everything on my ipod? And how exactly do I reset it? When you mean copying everything over again, how I do that automatically?
Sorry for the dumb Q's, I'm just stupid at this stuff.

Plug in your iPod and run your iPod Updater Utility, which should be in the Apple group in your Start menu. Select the option to restore. This will delete everything from your iPod.

Then, plug in your iPod again, and in iTunes, select the option to automatically update your iPod. In theory, since you have the artwork stored on your computer in iTunes, it should get copied back over to the iPod. If that doesn't work, the worst that happens is that you are basically back where you began.