Newbie: Prosper with Lyx under OS X

Hi I've been trying to get prosper to work with Lyx on my Mac (under  
10.2.6).

I can generate the prosper-tour.pdf file from the .tex file in the doc  
directory of the prosper tarball.  So I am reasonably happy that my  
(te)TeX system is working as it should.

I have installed prosper.layout from  
http://www.math.tau.ac.il/~dekelts/slides/ and configured Lyx so that  
it knows about prosper.  However when I try to get Lyx to make a pdf of  
any prosper based document I create, I get error messages along the  
lines of :
Class prosper Error: unkown Prosper style file: PPRenglish.sty

and

LaTeX Error; Environment posit@Box undefined. \lyxnewslide{introduction}



Does anybody have any idea what I might be doing wrong?

Cheers


Simon



************************************************************************ 
*******
Dr Simon Martin					   Tel   0114 2224285
Department of Physics and Astronomy	    Fax 0114 2728079
University of Sheffield
Sheffield S3 7RH
UK



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