function category_update(y, m, d) {
	delDay = 7;
	oldDay = new Date(y + "/" + m + "/" +d);
	newDay = new Date();
	d =(newDay - oldDay) / (1000 * 24 * 3600);
	if(d <= delDay) {
		document.write("<span class='mark'>up!</span>");
	}
}