User:Greenitthe/timeless.js
From IdleOn MMO Wiki
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var images = ['https://static.miraheze.org/idleonwiki/2/26/Background.png', 'https://static.miraheze.org/idleonwiki/0/07/Desert_bg1.png','https://static.miraheze.org/idleonwiki/5/57/Sewer_bg1.png'];
var bgElemStyle = document.getElementById('mw-content-container').style
bgElemStyle.background = ('url(' + images[Math.floor(Math.random() * images.length)] + ') no-repeat center center fixed');
bgElemStyle.webkitBackgroundSize = 'cover';
bgElemStyle.mozBackgroundSize = 'cover';
bgElemStyle.oBackgroundSize = 'cover';
bgElemStyle.backgroundSize = 'cover';
