Using iWeb on a different Mac?

I designed, published and am regularly updating a site using iWeb on my iMac at home. A friend is going to help me with the design, and he will be doing the work from his Mac at home.



How do I do this? Is there a particular folder I need to give him that has the files that iweb uses to publish the site? And once his work is done, do I transfer the new files back to my iMac?



thanks!