need help in the next call back function

I am currently working on the next push button call back function. what I want is to press the next button and it shows a picture and I press it again it shows another picture.

I know how to make a call back function for "one button for one picture". But I do not know how to deal with next push button call back function. Thanks in advance

Here is my code

if true
  % code
end
btn_type=uicontrol(fig,...
  'Style','push','units','normalized',...
  'Position',[0.01 0.32 0.08 0.04],...
  'Tooltip','Run',...
  'String','before',...
   'Callback',[...
    '']);
btn_type=uicontrol(fig,...
  'Style','push','units','normalized',...
  'Position',[0.2 0.32 0.08 0.04],...
  'Tooltip','Run',...
  'String','next',...
   'Callback',[...
    '']);

Answer 1

[Subhra Saha]

You can read the images into an array and then keep an index variable to loop over the images and then display them.

Below is a link describing the same:

http://stackoverflow.com/questions/25009095/how-to-add-next-and-previous-buttons-in-matlab