(function () { const bodyStyle = document.body.style; function setImage(url) { bodyStyle.backgroundImage = "url('" + url + "')"; } switch (new Date().getMonth()) { case 0: setImage('/images/jwsfp1.gif'); break; case 3: setImage('/images/background2.gif'); break; case 9: setImage('/images/halloween_background_1.gif'); break; case 10: setImage('/images/topwwbackground.gif'); break; case 11: setImage('/images/christmas.gif'); break; } })();