// script setting
var offset  = 3;
var mark    = '<img src="http://kamiu.tank.jp/img/icon/new22.gif" width="31" height="21" style="vertical-align:middle" />';

// script body
var nowdate = Date.parse(new Date().toUTCString()) / 1000 - (offset * 86400);

function writeNewIcon (param)
{
	if (nowdate < param) {
		document.write(mark);
	}
}