How to randomly change an image upon refresh?

Hello, I just started my website and i was wondering if it is possible to randomly change an image upon reloading the page? I can't really find the answer anywhere and the widget confuses me.. anyone knows the answer to this one?

it can be done with javascript and cookie.
q: how are you with javascript?
http://www.cyclosaurus.com/iWeb2/Welcome.html
background will change when you refresh the page.

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How to randomly change an image upon refresh?

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