check clickpoints points to the images and images in a folder is same

Sir, In the above code, the first click point checks the first image in a folder and if I select the next click point, it does not compare with the second click point rather automatically compares with the first image i.e. a1 and the second image in a folder. Please solve my issue as early as possible.

function [pts]=ImageClickCallback4 ( str1,a1,a2,a3,a4,a5,a6,n1)
  global ii;
  ii=1;
  a1=rgb2gray(a1);
  a2=rgb2gray(a2);
  a3=rgb2gray(a3);
  a4=rgb2gray(a4);
  a5=rgb2gray(a5);
  a6=rgb2gray(a6);
  image_folder = 'C:\Users\maruthi1\Documents\MATLAB\User_reg\'
  image_folder=strcat(image_folder,str1);
  filenames = dir(fullfile(image_folder, '*.jpg'));  % read all images with specified extention, its jpg in our case
   total_images = numel(filenames);  
   if(~isequal(total_images,n1))
       message     = sprintf('Please enter correct number');
  helpdlg(message); 

    end
     for n = 1:total_images
      full_name= fullfile(image_folder, filenames(n).name);         % it will specify images names with full path and extension
      our_images = imread(full_name); 
      our_images=rgb2gray(our_images);
    %subplot(3,3,n);
       % imshow(our_images) ;                 % Show all images
     end
     pts = zeros(2, n1);
         % display image
    xold = 0;
    yold = 0;
    k = 0;
    hold on;  
    mp1=340;

    % and keep it there while we plot
    while 1

           [xi, yi, but] = ginput(1);      % get a point
        if ~isequal(but, 1)             % stop if not button 1
            break
        end

        k = k + 1;
        pts(1,k) = xi;
        pts(2,k) = yi;

     % count total number of photos present in that folder

     if(xi<mp1)
         if(yi<340)
            if(corr2(a1,our_images)<0.91)
                ii=ii+1;

            end

            else if((340<yi)&(yi<679))

                  if(corr2(a2,our_images)<0.91)
                ii=ii+1;
                disp('hai');

                else
                    disp('nothing')

                  end

     else
         if((680<yi)&(yi<1020))

                     if(corr2(a3,our_images)<0.91)
                ii=ii+1;
                disp(ii);
                disp('hallo');

     %drawnow; % Force display to update immediately.

         end
         end
                end
         end

     else

                if(yi<340)
                     if(corr2(a4,our_images)==1)
                ii=ii+1;
                     end

                else
                    if((340<yi)&(yi<679))
                        if(corr2(a5,our_images)==1)
                ii=ii+1;
                        end

                    else 
             if((680<yi)&(yi<1020))
             if(corr2(a6,our_images)==1)

                ii=ii+1;
             end

             end
                    end
                end
         end

     if isequal(k, n1)
              break;
          end
          xold = xi;
          yold = yi;
    end
         hold off;
    if k < size(pts,2)

        pts = pts(:, 1:k);

    end
      if(ii<=n1)
          disp(ii)
          msgbox('wrong password');
      end

    end