function newmark() {
	// passage time (hour)
	var pass = 168;
 
	// display content
	var content = 'New';
 
	var currentDate = new Date(); 
	var spans = document.getElementsByTagName('span');
	for (i = 0; i < spans.length; i++) {
		if (spans[i].getAttribute('class') == 'new' ||
		spans[i].getAttribute('className') == 'new') {
			if (spans[i].childNodes[0]) {
				time = spans[i].childNodes[0].nodeValue.split(":");
				var entryDate = new Date(time[0], time[1]-1, time[2], time[3], time[4], time[5]); 
				var now = (entryDate.getTime() - currentDate.getTime())/(60*60*1000); 
				now = Math.ceil(now);
				if(-now <= pass){
					spans[i].innerHTML = content;
					spans[i].style.display = 'inline';
				}
			}
		}
	}
}

try{
	window.addEventListener("load",newmark,false);
}catch(e){
	window.attachEvent("onload",newmark);
}