copy genius playlist to 160GB ipod, I have no access for a copy function

Is this Genius Playlist located in the left hand sidebar/pane of iTunes? What happens when you try to drag it? Are you manually managing your iPod's contents? In other words, is the Manually manage music and videos option enabled from under the iPod's Summary tab? If not, you are automatically syncing your device with iTunes, which means you must configure the playlist to sync to your iPod from under the iPod's Music configuration tab in iTunes.

See here for more information: iPhone and iPod: Understanding Genius Mixes

B-rock