some trouble about background in gui

I have problem to make background in gui. I'm using this code. It work to display my image as background, but when i browse another image, my background change become the image that i browse.

here my code:

 function tes2_OpeningFcn(hObject, eventdata, handles, varargin)
 handles.output = hObject;
 guidata(hObject, handles);
 ha = axes('units','normalized','position',[0 0 1 1]);
 uistack(ha,'bottom');
 [back map] = imread('Marilyn-Monroe-22388.jpg');
 image(back)
 colormap (map)
 set(ha,'handlevisibility','off','visible','off')
 function Open_Callback(hObject, eventdata, handles)
 global citra
 try
 [filename, foldername] = uigetfile('*.jpg'); 
 if filename ~= 0
 FileName = fullfile(foldername, filename);
 end 
 citra = imread(FileName);
 imshow(citra, []);  
 end
 handles.citra=citra;
 guidata(hObject,handles);
thanks before

[Walter Roberson]

Please read the guide to tags and retag this question; see http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

[Walter Roberson]

You have not indicated the difference between how the program behaves and how you want it to behave. You mentioned how it does behave, but not what you want it to do differently.

[Lidank Abiel]

I'm sorry sir