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var rand_int = Math.floor(Math.random() * 3); var banner_img_elem = document.getElementById('top_banner_img'); if (rand_int == 0) { banner_img_elem.src = "https://i3.ruliweb.com/ori/21/03/22/1785959d354500774.png"; } else if (rand_int == 1) { banner_img_elem.src = "https://i3.ruliweb.com/ori/21/03/22/1785959d354500774.png"; } else { banner_img_elem.src = "https://i3.ruliweb.com/ori/21/03/22/1785959d354500774.png"; }