// term(unit:day)
var term = 3;
 
// display image
var image = '<img src="http://www.coolwebwindow.com/image/updated_pink.png" />';
 
var currentDate = new Date(); 
var elements = document.getElementsByTagName('div');
for (i = 0; i < elements.length; i++) {
    if(elements[i].getAttribute('id') == 'updated') {
        time = elements[i].childNodes[0].nodeValue.split(":");
        var entryDate = new Date(time[0], time[1]-1, time[2], time[3], time[4], time[5]); 
        var now = (currentDate.getTime() - entryDate.getTime())/(24*60*60*1000); 
        now = Math.ceil(now);
        if(now <= term){
            elements[i].innerHTML = image;
            elements[i].style.display = 'inline';
        }
    }
}