ranimg = new Array();
ranimg[0]="http://www.laelde.jp/img/bgPhoto20072.jpg";
ranimg[1]="http://www.laelde.jp/img/bgPhoto20070.jpg";
ranimg[2]="http://www.laelde.jp/img/bgPhoto20071.jpg";
xx = Math.floor(ranimg.length*Math.random());
ranimg = ranimg[Math.floor(xx)];
document.write ('<style type="text/css"><!--#photo {background-image: url("'+ ranimg +'");background-position: center;}--></style>');