R help - Dec 2003 - Johnson's Sb distribution

Hi all;

I'm working with the library SuppDists trying to fit a Johnson's Sb
distribution to a dataset. It works fine, but I need to set one of the
location parameters (epsilon) to zero. How can I do this using the
function JohnsonFit() or any other similar? ...and Is it possible to
define the type (SN,SL,SB,SU) or the library assumes the type
automatically depending on the data?

Thanks for any hint

Christian