var wall = new Array();

wall[0] = "http://alive-inc.co.jp/images/topimg01.jpg";
wall[1] = "http://alive-inc.co.jp/images/topimg02.jpg";
wall[2] = "http://alive-inc.co.jp/images/topimg03.jpg";

var rnd = Math.floor((Math.random() * 100)) % wall.length;
document.write('<style type="text/css">#top-mainimg { background-image:url(' , wall[rnd] , '); }</style>');


var wallpage = new Array();

wallpage[0] = "http://alive-inc.co.jp/images/pageimg01.jpg";
wallpage[1] = "http://alive-inc.co.jp/images/pageimg02.jpg";
wallpage[2] = "http://alive-inc.co.jp/images/pageimg03.jpg";

var rnd = Math.floor((Math.random() * 100)) % wallpage.length;
document.write('<style type="text/css">#page-mainimg { background-image:url(' , wallpage[rnd] , '); }</style>');