// メインナビにあるサブメニュー表示機能
var submenuIO = 0;
var default_submenu = null;
var current_menu = null;
var current_submenu = null;

function menusOff() {
	current_submenu.style.display = 'none';
	submenuIO = 0;
}

function showSubmenu(menuID) {
	if (browser_test != 1) return;
	var menu = document.getElementById(menuID);
	if (submenuIO == 1 && current_submenu != null) {
		menusOff();
	}
	var submenuID = menuID + '-submenu';
	if (document.getElementById(submenuID) != null) {
		current_submenu = document.getElementById(submenuID);
		current_submenu.style.display = 'block';
	} else if (default_submenu != null) {
		default_submenu.style.display = 'block';
		current_submenu = default_submenu;
	}
	submenuIO = 1;
	current_menu = menu;
	return;
}

function browserCheck() {
	var app = navigator.appName.toLowerCase();
	var app_v = parseInt(navigator.appVersion);
	var ua = navigator.userAgent.toLowerCase();
	var plt = navigator.platform.toLowerCase();
	var check;
	if (window.opera) {
		if (ua.indexOf('opera 7') != -1 || ua.indexOf('opera/7') != -1) {
			check = 1;
		} else if (app.indexOf('opera') != -1 && app_v <= 7) {
			check = 0;
		} else {
			check = 0;
		}
	} else {
		check = 1;
	}
	return check;
}

var browser_test;
function initNav(submenuID) {
	browser_test = browserCheck();
	default_submenu = document.getElementById(submenuID);
	current_submenu = default_submenu;
	submenuIO = 1;
}

function initPage() {
	// do nothing
}

// カテゴリリストの開閉機能
if (!document.getElementById)
    document.getElementById = function() { return null; }

function initializeMenu(menuId, actuatorId, open) {
    var menu = document.getElementById(menuId);
    var actuator = document.getElementById(actuatorId);

    if (menu == null || actuator == null) return;

    if (window.opera) return;

    if (open == true) {
	menu.style.display = "block";
    	actuator.parentNode.style.backgroundImage = "url(../media/i_minus.gif)";
    }

    actuator.onclick = function() {
        var display = menu.style.display;
        this.parentNode.style.backgroundImage =
            (display == "block") ? "url(../media/i_plus.gif)" : "url(../media/i_minus.gif)";
        menu.style.display = (display == "block") ? "none" : "block";

        return false;
    }
}