There are a number of ways to do this, some more successful than others.
1. You could edit the pictures together into one image with an image editor, and then adjust the size of the picture to fit the width of the browser viewport with the width: 100%; style.
2. Use the big image (maybe with the top image edited in) as the background. Use css relative (%) styles to position the other images and adjust their sizes.
3. Use CSS to position all of the images.
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since Jan 2007