function new_mark(y, m, d, cl) {
	keep_day = 7; // この日数表示されます
	old_day = new Date(y + "/" + m + "/" +d);
	new_day = new Date();
	d =(new_day - old_day) / (1000 * 24 * 3600);

	if(d <= keep_day) {
	if(cl == "new") document.write("<span class='newmark'>new</span>"); // Newマー
	}
}