Standard Color codes for atoms

 Hello all,
 I am looking for the standard color codes for atoms. As far as I can
 remember the standard color for Carbon is black, the one for Oxigen is
 blue, Nitrogen is Green. But I am not sure, I am just guessing.
 Does anyone know where to get (a more complete) list of color codes for
 atoms ?
 I need this information for a molecule viewer I am developing.
 Kind regards, Gerrit-Jan Linker
 Analyst/Programmer -: at :- SCT International, Manchester, UK
 email:  gjlinker-: at