Pixar Eye tutorial problems

kind of a stupid question, but, I’m having issues getting the different materials all on the same mesh (pixar eye tutorial)

also my lense is cating shadows
any nswers?

theres a multimaterial example in the blender 2.3 manual

or you could look at this realy well done video TUT: 3rd Post down the page. https://blenderartists.org/forum/viewtopic.php?t=31669&start=15 Enjoy!