help an ipod nano noob separate the audio books from the music during shuffle

[thekingofboggle]

hey all, i bought my wife the 1st gen ipod nano for her birthday and we are trying to set her up. she wants to have her audio book (learn to speak french) on her nano but she finds that when she hits shuffle, to listen to a music mix, tracks of her audio book well pop up in the mix. i had a look at it, thinking there must be a way around this, but shuffle is at a lower level than the playlist selection so i couldn't seem to find a way to do this. any know how to?