MediaWiki:Common.js

$(function {   var bgImages = ['/w/images/b/b1/Kameoalpha.png', '/w/images/c/c3/Fergyalpha.png', '/w/images/2/22/Banjoalpha.png'];    $('div#content').css('background-image', 'url(' + bgImages[Math.floor(Math.random * bgImages.length)] + ')'); });