var today = new Date();//t擾
var kigen = new Date("2011/05/21");//JI+1
//var calc = today.getTime() - kigen.getTime();
//var daysLeft = Math.ceil(calc/(24*60*60*1000));

if (today > kigen ){
document.write('<img src="http://www.jfe-tec.co.jp/img/event-check-top.gif">');
}