2008-10-30 this is a pen. http://d.hatena.ne.jp/amachang/20070917/1190015123 http://www.fladdict.net/blog-jp/archives/2005/09/javascript_acti.php http://www.atmarkit.co.jp/fdotnet/ajaxjs/ajaxjs04/ajaxjs04_01.html http://builder.japan.zdnet.com/sp/javascript-kickstart-2007/story/0,3800083428,20371112,00.htm