$(document).ready(function(){
    // show calendar
	var obj_datepicker = $("#datepicker");
	var obj_cal_date = $("#cal_date");
	if (obj_datepicker.length > 0 && obj_cal_date.length > 0)
	{
		obj_cal_date.change(function(){
			obj_datepicker.load(obj_cal_date.val());
		});
		obj_datepicker.load(obj_cal_date.val());
	}
});