a month ago someone asked about selecting hydrogens bonded to nitrogens.
The only solution found at this time was to work with distance.
A new command substructure() has been added to the development version of =
Jmol that should work for this :
select hydrogen and substructure(=22=5BNH=5D=22)
To try it, you will have to checkout the latest version of the source code=
from CVS and build Jmol.