How to
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Here a working example.
1)
Include the lines in example/style.css in your template style.css. Modify them to 
fit your html structure (DOM).

2)
Move the relatedImage.jpg image into your images/ template folder.

3)
Insert this line into your template
<?=related_posts()?>  

You'll obtain something like http://www.dynamick.it/modelli-logo-941.html