I need help with itunes!!

I need help with the itunes!! k I converted episodes and put them on itunes so they can go on my ipod... but I have over 100 episodes and when it goes to 100 it goes by the episode 10. I deleted all of the episodes and did like 001 and 010 and 100 but...

when I put them back onto ituens it does 1 and 10 and 100. so how do I make it so my episodes will go in order not like when its 100 it goes by 10 and 120 it goes by 12 and 13 it goes by 13 etc... help please!!

anyone???