cover = new Array();
cover[0] = '/wp-content/themes/xcity-ja/img/cover1.jpg';
cover[1] = '/wp-content/themes/xcity-ja/img/cover2.jpg';
cover[2] = '/wp-content/themes/xcity-ja/img/cover3.jpg';
r = Math.floor(Math.random()*cover.length);
document.write('<style type="text/css">');
document.write('#main{background: url("'+cover[r]+'") no-repeat;}');
document.write('</style>');