var bt_max_num = 40;
var bt_common_url = 'http://weblog.news.coocan.jp/widgets/blog_tattoo/images/';
var bt_now = new Date();
var bt_num = Math.floor( ( Math.random() * 1000 ) + bt_now.getSeconds() ) % bt_max_num;
document.write('<center><a href="http://weblog.news.coocan.jp/widgets/blog_tattoo/"><img src="' + bt_common_url + bt_num.toString() + '.gif" alt="blog_tattoo" border="0"></a></center>');