function displayNewMark(){
	if (!document.getElementsByTagName) return;
	// passage time
	var passageTime = 144;
	// display mark
	var mark = 'New!!';
	var currentDate = new Date();
	var elements = document.getElementsByTagName('span');
	for (var i = 0, len = elements.length; i < len; i++) {
		if(elements[i].className == 'new') {
		var time = elements[i].firstChild.nodeValue.split(':');
        	var entryDate = new Date(time[0], time[1]-1, time[2], time[3], time[4], time[5]); 
        	var currentTime = (entryDate.getTime() - currentDate.getTime())/(60*60*1000);
        	currentTime = Math.ceil(currentTime);
        	if(-currentTime <= passageTime){
            		elements[i].innerHTML = mark;
            		elements[i].style.display = 'inline';
		        }
    		}
	}
}