d=document;
title=encodeURIComponent(d.title);
url=encodeURIComponent(d.location.href);
i="<img src=\"http://www.aivy.co.jp/BLOG_TEST/nagasawa/images/twit_this.png\" style=\"border:none;vertical-align:middle\">twit this!";
document.write("<a href=\"http://twitter.com/home?status="+title+"%20"+url+"%20"+"\" target=\"_blank\">"+i+"</a>");