Board Thread:Support Requests - Getting Technical/@comment-25653892-20151005192456/@comment-9346948-20151005200129

function randomBg { var imgs = [ 'background 1', 'background 2', 'background 3' (you get the point) ];   $('body').css('background-size', 'fix', 'cover'); $('body').css('background-image', 'url(' + imgs[Math.floor((imgs.length) * Math.random)] + ')'); } randomBg;

This should do it. Not sure if this way would obstruct ads though.