var mess = new Array('<link rel="stylesheet" type="text/css" href="/bg1.css" />','<link rel="stylesheet" type="text/css" href="/bg2.css" />','<link rel="stylesheet" type="text/css" href="/bg3.css" />','<link rel="stylesheet" type="text/css" href="/bg4.css" />');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);