function [Volume] = fmris_hbfget_cb(Volume);

Volume.Design.HRF.Error=0;
for i=1:Volume.Design.HRF.maxno;
   for j=1:5;
      if isempty(get(findobj(gcf,'Tag',['HRF_' num2str(i) '_' num2str(j)]),'String'))
         Volume.Design.HRF.Error=1;
      end
   end
end

if Volume.Design.HRF.Error==1;
   errordlg('Undefined HRF Params','HRF Error');
else
   Volume.Design.HRF.HRF=zeros(Volume.Design.HRF.maxno,6);
   for i=1:Volume.Design.HRF.maxno;
      for j=1:5;
         Volume.Design.HRF.HRF(i,j)=str2num(get(findobj(gcf,'Tag',['HRF_',num2str(i),'_',num2str(j)]),'String'));
      end
   end
end