function a = fig_nudge(gca,horiz,vert)
% function a = fig_nudge(gca,horiz,vert)
%  nudges the panel gca horiz in the horizontal
% direction and vert in the vertical direction

pos = get(gca,'position');
pos(1) = pos(1) + horiz;
pos(2) = pos(2) + vert;
set(gca,'position',pos); 