// Random image JavaScript Document
var arr = [
   '<link href="/common/css/parts/header-img01.css" rel="stylesheet" type="text/css" media="screen, projection, tv" />',
   '<link href="/common/css/parts/header-img02.css" rel="stylesheet" type="text/css" media="screen, projection, tv" />',
   '<link href="/common/css/parts/header-img03.css" rel="stylesheet" type="text/css" media="screen, projection, tv" />',
   '<link href="/common/css/parts/header-img04.css" rel="stylesheet" type="text/css" media="screen, projection, tv" />'
];
document.write(arr[Math.floor(Math.random() * arr.length)]);