step 1. look at the following image
step 2. Click the button, then you can see the next image.
step 3. If you click the button continuously, it makes 'slide show'.
If the slide show's images are differnt size, it is not a good way to do like this. the size of first image make the other images have same size. so, small image is expanded, large image is reduced.
I suggest other solution in here