// global menu state
var menuReady = false;

// pre-cache menubar image pairs
if (document.images) {
    var imagesNormal = new Array();
    imagesNormal["piano"] = new Image(20, 120);
    imagesNormal["piano"].src = "images/piano2_off.png";
    imagesNormal["doitsukara"] = new Image(20, 120);
    imagesNormal["doitsukara"].src  = "images/doitsukara_off.png";
    imagesNormal["konzert"] = new Image(20, 100);
    imagesNormal["konzert"].src  = "images/konzert_off.png";
    imagesNormal["column"] = new Image(20, 100);
    imagesNormal["column"].src  = "images/column_off.png";
    imagesNormal["kyoshitsu"] = new Image(20, 120);
    imagesNormal["kyoshitsu"].src  = "images/kyoshitsu_off.png";
    imagesNormal["links"] = new Image(20, 80);
    imagesNormal["links"].src  = "images/links_off.png";

    var imagesHilite = new Array();
    imagesHilite["piano"] = new Image(20, 120);
    imagesHilite["piano"].src = "images/piano2_on.png";
    imagesHilite["doitsukara"] = new Image(20, 120);
    imagesHilite["doitsukara"].src  = "images/doitsukara_on.png";
    imagesHilite["konzert"] = new Image(20, 80);
    imagesHilite["konzert"].src  = "images/konzert_on.png";
    imagesHilite["column"] = new Image(20, 100);
    imagesHilite["column"].src  = "images/column_on.png";
    imagesHilite["kyoshitsu"] = new Image(20, 120);
    imagesHilite["kyoshitsu"].src  = "images/kyoshitsu_on.png";
    imagesHilite["links"] = new Image(20, 80);
    imagesHilite["links"].src  = "images/links_on.png";
}

function getElementStyle(elem, IEStyleProp, CSSStyleProp) {
    if (elem.currentStyle) {
        return elem.currentStyle[IEStyleProp];
    } else if (window.getComputedStyle) {
        var compStyle = window.getComputedStyle(elem, "");
        return compStyle.getPropertyValue(CSSStyleProp);
    }
    return "";
}

// carry over some critical menu style sheet attribute values
var CSSRuleValues = {menuItemHeight:"18px",
                     menuItemLineHeight:"1.4em",
                     menuWrapperBorderWidth:"2px",
                     menuWrapperPadding:"3px",
                     defaultBodyFontSize:"12px"
                    };

// specifications for menu contents and menubar image associations
var menus = new Array();
menus[0] = {mBarImgId:"menuImg_1",
            mBarImgNormal:imagesNormal["piano"],
            mBarImgHilite:imagesHilite["piano"],
            menuItems:[　{text:"ピアノ教室山形", href:"index.html"},
            {text:"最初の生徒Ｍ君", href:"mkun.html"},
            {text:"ピアノレッスンの料金", href:"lesson.html"},//hier meldet Konqueror ERROR (auch OPERA!)
            	         {text:"自己紹介", href:"profile.html"}
            ],
            elemId:""
           };
menus[1] = {mBarImgId:"menuImg_2",
            mBarImgNormal:imagesNormal["doitsukara"],
            mBarImgHilite:imagesHilite["doitsukara"],
            menuItems:[ {text:"ファンタジー豊かな子供達", href:"Fantasie.html"},
                        {text:"リフレッシュしたい先生達", href:"Senseitachi.html"},
                        {text:"新しくママになる人達", href:"MamaNiNaru.html"},
                        {text:"お孫さんとデュエットを", href:"MagosanTo.html"},
	        {text:"ピアノの練習はストレス？", href:"SeitoNi.html"},
                        {text:"音楽がほしいお父さん", href:"OngakuOtosan.html"},
                        {text:"同世代の人へ", href:"Dosedai.html"},
                        {text:"忙しい現代人へ", href:"Gendaijin.html"}
                      ],
            elemId:""
           };
menus[2] = {mBarImgId:"menuImg_3",
            mBarImgNormal:imagesNormal["konzert"],
            mBarImgHilite:imagesHilite["konzert"],
            menuItems:[ {text:"クリスマスコンサート", href:"5konzert1.html"},
                        {text:"蔵のカフェ･コンサート", href:"5konzert2.html"},
			{text:"ドイツ･レクイエム演奏会", href:"requiem.html"}
//                        {text:"Export", href:"catalog_export.html"},
//                        {text:"Order Print Catalog", href:"catalog_order.html"}
                      ],
            elemId:""
           };
menus[3] = {mBarImgId:"menuImg_4", 
            mBarImgNormal:imagesNormal["column"],
            mBarImgHilite:imagesHilite["column"],
            menuItems:[ {text:"ドイツの森から", href:"sakura1.html"},
                        {text:"もうすぐ夏休み！", href:"sakura2.html"},
                        {text:"夏休みはどうだった？", href:"sakura3.html"},
                        {text:"心に残ったオランダ人夫婦", href:"sakura4.html"},
                        {text:"「男子厨房に入らず」 ", href:"sakura5.html"},
                        {text:"冬の前の華やぎ ", href:"sakura6.html"},
                        {text:"久しぶりにドイツから ", href:"sakura7.html"},
                        {text:"「年中無休」ですって？", href:"sakura8.html"},
                        {text:"ウグイス嬢は健在だった～ ", href:"sakura9.html"},
                        {text:"旅行の季節ですね！でも", href:"sakura10.html"},
                        {text:"ないものねだり？それとも", href:"sakura11.html"},
                        {text:"春の色 ", href:"sakura12.html"},
                        {text:"ドイツでのお花見体験", href:"sakura13.html"},
                        {text:"衣替えなんて忘れていた！", href:"sakura14.html"},
                        {text:"騒々しさが日本の活気か？！", href:"sakura15.html"},
                        {text:"「長蛇の列」っていい響き？", href:"sakura16.html"},
                        {text:"「のぼり」はためく田舎道 ", href:"sakura17.html"},
                        {text:"再会、そして再開のコンサート", href:"sakura18.html"},
                        {text:"季節感はどこへ行った？", href:"sakura19.html"}
                      ],
            elemId:""
           };
menus[4] = {mBarImgId:"menuImg_5", 
            mBarImgNormal:imagesNormal["kyoshitsu"],
            mBarImgHilite:imagesHilite["kyoshitsu"],
            menuItems:[ {text:"ドイツ語教室", href:"Doitsugo.html"}
                      ],
            elemId:""
           };
menus[5] = {mBarImgId:"menuImg_6", 
            mBarImgNormal:imagesNormal["links"],
            mBarImgHilite:imagesHilite["links"],
            menuItems:[ 
                        {text:"リンク集", href:"linkshu.html"},
                        {text:"リンク交換", href:"xLinks.html"},
                        {text:"私の大学", href:"http://www.senzoku.ac.jp/"},
                        {text:"連絡先", href:"contact.html"}
                      ],
            elemId:""
           };

// create hash table-like lookup for menu objects with id string indexes
function makeHashes() {
    for (var i = 0; i < menus.length; i++) {
        menus[menus[i].elemId] = menus[i];
        menus[menus[i].mBarImgId] = menus[i];
    }
}

// assign menu label image event handlers
function assignLabelEvents() {
    var elem;
    for (var i = 0; i < menus.length; i++) {
        elem = document.getElementById(menus[i].mBarImgId);
        elem.onmouseover = swap;
        elem.onmouseout = swap;
    }
}

// invoked from init(), generates the menu div elements and their contents.
// all this action is invisible to user during construction
function makeMenus() {
    var menuDiv, menuItem, itemLink, mbarImg, textNode, offsetLeft, offsetTop;
    
    // determine key adjustment factors for the total height of menu divs
    
    var menuItemH = 0;
    var bodyFontSize = parseInt(getElementStyle(document.body, "fontSize", "font-size"));
    // test to see if browser's font size has been adjusted by the user
    // and that the new size registers as an applied style property
    if (bodyFontSize == parseInt(CSSRuleValues.defaultBodyFontSize)) {
        menuItemH = (parseFloat(CSSRuleValues.menuItemHeight));
    } else {
        // works nicely in Netscape 7
        menuItemH = parseInt(parseFloat(CSSRuleValues.menuItemLineHeight) * bodyFontSize);
    }
    var heightAdjust = parseInt(CSSRuleValues.menuWrapperPadding) + 
        parseInt(CSSRuleValues.menuWrapperBorderWidth);
    if (navigator.appName == "Microsoft Internet Explorer" && 
        navigator.userAgent.indexOf("Win") != -1 && 
        (typeof document.compatMode == "undefined" || 
        document.compatMode == "BackCompat")) {
        heightAdjust = -heightAdjust;
    }
    
    // use menus array to drive div creation loop
    for (var i = 0; i < menus.length; i++) {
        menuDiv = document.createElement("div");
        menuDiv.id = "popupmenu" + i;
        // preserve menu's ID as property of the menus array item
        menus[i].elemId = "popupmenu" + i;
        menuDiv.className = "menuWrapper";
        if (menus[i].menuItems.length > 0) {
            menuDiv.style.height = (menuItemH * menus[i].menuItems.length) - 
            heightAdjust + "px";
        } else {
            // don't display any menu div lacking menu items
            menuDiv.style.display = "none";
        }
        // define event handlers
        menuDiv.onmouseover = keepMenu;
        menuDiv.onmouseout = requestHide;

        // set stacking order in case other layers are around the page
        menuDiv.style.zIndex = 1000;
        
        // assemble menu item elements for inside menu div
        for (var j = 0; j < menus[i].menuItems.length; j++) {
            menuItem = document.createElement("div");
            menuItem.id = "popupmenuItem_" + i + "_" + j;
            menuItem.className = "menuItem";
            menuItem.onmouseover = toggleHighlight;
            menuItem.onmouseout = toggleHighlight;
            menuItem.onclick = hideMenus;
            menuItem.style.top = menuItemH * j + "px";
            itemLink = document.createElement("a");
            itemLink.href = menus[i].menuItems[j].href;
            itemLink.className = "menuItem";
            itemLink.onmouseover = toggleHighlight;
            itemLink.onmouseout = toggleHighlight;
            textNode = document.createTextNode(menus[i].menuItems[j].text);
            itemLink.appendChild(textNode);
            menuItem.appendChild(itemLink);
            menuDiv.appendChild(menuItem);
        }
        // append each menu div to the body
        document.body.appendChild(menuDiv);
    }
    makeHashes();
    assignLabelEvents();
    // pre-position menu
    for (i = 0; i < menus.length; i++) {
        positionMenu(menus[i].elemId);
    }
    menuReady = true;
}

// initialize global that helps manage menu hiding
var timer;

// invoked from mouseovers inside menus to cancel hide
// request from mouseout of menu bar image et al.
function keepMenu() {
    clearTimeout(timer);
}

function cancelAll() {
    keepMenu();
    menuReady = false;
}

// invoked from mouseouts to request hiding all menus
// in 1/4 second, unless cancelled
function requestHide() {
    timer = setTimeout("hideMenus()", 250);
}

// "brute force" hiding of all menus and restoration
// of normal menu bar images
function hideMenus() {
    for (var i = 0; i < menus.length; i++) {
       document.getElementById(menus[i].mBarImgId).src = menus[i].mBarImgNormal.src;
       var menu = document.getElementById(menus[i].elemId)
       menu.style.visibility = "hidden";
    }
}

// set menu position just before displaying it
function positionMenu(menuId){
    // use the menu bar image for position reference of related div
    var mBarImg = document.getElementById(menus[menuId].mBarImgId);
    var offsetTrail = mBarImg;
    var offsetLeft = 0;
    var offsetTop = 0;
    while (offsetTrail) {
        offsetLeft += offsetTrail.offsetLeft;
        offsetTop += offsetTrail.offsetTop;
        offsetTrail = offsetTrail.offsetParent;
    }
    if (navigator.userAgent.indexOf("Mac") != -1 && 
        typeof document.body.leftMargin != "undefined") {
        offsetLeft += document.body.leftMargin;
        offsetTop += document.body.topMargin;
    }
    var menuDiv = document.getElementById(menuId);
    menuDiv.style.left = offsetLeft + "px";
    menuDiv.style.top = offsetTop + mBarImg.height + "px";
}

// display a particular menu div
function showMenu(menuId) {
    if (menuReady) {
        keepMenu();
        hideMenus();
        positionMenu(menuId);
        var menu = document.getElementById(menuId);
        menu.style.visibility = "visible";
    }
}

// menu bar image swapping, invoked from mouse events in menu bar
// swap style sheets for menu items during rollovers
function toggleHighlight(evt) {
    evt = (evt) ? evt : ((event) ? event : null);
    if (typeof menuReady != "undefined") {
        if (menuReady && evt) {
            var elem = (evt.target) ? evt.target : evt.srcElement;
            if (elem.nodeType == 3) {
                elem = elem.parentNode;
            }
            if (evt.type == "mouseover") {
                keepMenu();
                elem.className ="menuItemOn";
            } else {
                elem.className ="menuItem";
                requestHide();
            }
            evt.cancelBubble = true;
        }
    }
}

function swap(evt) {
    evt = (evt) ? evt : ((event) ? event : null);
    if (typeof menuReady != "undefined") {
        if (evt && (document.getElementById && document.styleSheets) && menuReady) {
            var elem = (evt.target) ? evt.target : evt.srcElement;
            if (elem.className == "menuImg") {
                if (evt.type == "mouseover") {
                    showMenu(menus[elem.id].elemId);
                    elem.src = menus[elem.id].mBarImgHilite.src;
                } else if (evt.type == "mouseout") {
                    requestHide();
                }
                evt.cancelBubble = true;
            }
        }
    }
}

// create menus only if key items are supported
function initMenus() {
    if (document.getElementById && document.styleSheets) {
        setTimeout("makeMenus()", 5);
        window.onunload=cancelAll;
    }
}