ranimg = new Array(); 
ranimg[0]="http://www.shine.co.jp/wp/wp-content/themes/shine/images/satomi.jpg";


xx = Math.floor(ranimg.length*Math.random()); 
ranimg = ranimg[Math.floor(xx)]; 
document.write ('<style type="text/css"><!--#random {background-image: url("'+ ranimg +'");background-position: center;}--></style>');