function cal_init() {
	link_list = document.getElementById('calendars').getElementsByTagName('span');
	for (i=0;i<link_list.length;i++) {
		link_list[i].style.color = "blue";
		link_list[i].style.textDecoration = "underline";
		link_list[i].style.cursor = "pointer";
		link_list[i].onclick = pick_day;
	}
}
function pick_day() {
	date_str = this.id;
	date_year = date_str.substring(1,3);
	date_month = date_str.substring(4,6);
	date_day = date_str.substring(7);
	var d = new Date();
	current_year = d.getFullYear();
	document.getElementById('date_day').selectedIndex = date_day - 1;
	document.getElementById('date_month').selectedIndex = date_month - 1;
	document.getElementById('date_year').selectedIndex = date_year - current_year + 2000;
}