// JavaScript Document

var i;
var calcnt = 10; //スケジュールが分かっている月のカウント
var calnavi = calcnt - 1;
var month = new Array(calcnt);

var my_date = new Date();
var my_month = my_date.getMonth();

//var this_month = my_date.getMonth() + 1;

window.onload = function my_cal() {
	for (i = 0; i < calcnt; i++) {
		month[i] = "<img class='calcnt' src='http://www.nankyudai.ac.jp/library/img/cal" + i + ".gif' />";
	}
	document.getElementById('contain').innerHTML = month[my_month];
	do_with_min_cal();
	do_with_max_cal();
	if( calcnt == 1) {
		document.getElementById('calPrev').style.visibility = "hidden";
		document.getElementById('calNext').style.visibility = "hidden";
	}
	document.getElementById('myDateCal').innerHTML = "2010年" + ( my_month + 1 ) + "月";
}

function my_cal_left() {
	if ( my_month > 0) {
		my_month = my_month - 1;
		do_with_change_cal();
		do_with_min_cal();
	}
}

function my_cal_right(){
	if ( my_month < calcnt - 1) {
		my_month = my_month + 1;
		do_with_change_cal();
		do_with_max_cal();
	}
}

function do_with_min_cal(){
	if( my_month <= 0) {
		document.getElementById('calPrev').style.visibility = "hidden";
	}
}

function do_with_max_cal(){
	if( my_month > calcnt - 2) {
		document.getElementById('calNext').style.visibility = "hidden";
	}
}

function do_with_change_cal(){
	//alert(calnavi + "and" + calcnt);
	document.getElementById('myDateCal').innerHTML = "2010年" + ( my_month + 1 ) + "月";
	document.getElementById('contain').innerHTML = month[my_month];
	document.getElementById('calPrev').style.visibility = "visible";
	document.getElementById('calNext').style.visibility = "visible";
}