var isDOM = (document.getElementById ? true : false); 
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);
function getRef(id) {
if (isDOM) return document.getElementById(id);
if (isIE4) return document.all[id];
if (isNS4) return document.layers[id];
}
function getSty(id) {
return (isNS4 ? getRef(id) : getRef(id).style);
} 
// Hide timeout.
var popTimer = 0;
// Array showing highlighted menu items.
var litNow = new Array();
function popOver(menuNum, itemNum) {
clearTimeout(popTimer);
hideAllBut(menuNum);
litNow = getTree(menuNum, itemNum);
changeCol(litNow, true);
targetNum = menu[menuNum][itemNum].target;
if (targetNum > 0) {
thisX = parseInt(menu[menuNum][0].ref.left) + parseInt(menu[menuNum][itemNum].ref.left);
thisY = parseInt(menu[menuNum][0].ref.top) + parseInt(menu[menuNum][itemNum].ref.top);
with (menu[targetNum][0].ref) {
left = parseInt(thisX + menu[targetNum][0].x);
top = parseInt(thisY + menu[targetNum][0].y);
visibility = 'visible';
      }
   }
}
function popOut(menuNum, itemNum) {
if ((menuNum == 0) && !menu[menuNum][itemNum].target)
hideAllBut(0)
else
popTimer = setTimeout('hideAllBut(0)', 500);
}
function getTree(menuNum, itemNum) {

// Array index is the menu number. The contents are null (if that menu is not a parent)
// or the item number in that menu that is an ancestor (to light it up).
itemArray = new Array(menu.length);

while(1) {
itemArray[menuNum] = itemNum;
// If we've reached the top of the hierarchy, return.
if (menuNum == 0) return itemArray;
itemNum = menu[menuNum][0].parentItem;
menuNum = menu[menuNum][0].parentMenu;
   }
}

// Pass an array and a boolean to specify colour change, true = over colour.
function changeCol(changeArray, isOver) {
for (menuCount = 0; menuCount < changeArray.length; menuCount++) {
if (changeArray[menuCount]) {
newCol = isOver ? menu[menuCount][0].overCol : menu[menuCount][0].backCol;
// Change the colours of the div/layer background.
with (menu[menuCount][changeArray[menuCount]].ref) {
if (isNS4) bgColor = newCol;
else backgroundColor = newCol;
         }
      }
   }
}
function hideAllBut(menuNum) {
var keepMenus = getTree(menuNum, 1);
for (count = 0; count < menu.length; count++)
if (!keepMenus[count])
menu[count][0].ref.visibility = 'hidden';
changeCol(litNow, false);
}

// *** MENU CONSTRUCTION FUNCTIONS ***

function Menu(isVert, popInd, x, y, width, overCol, backCol, borderClass, textClass) {
// True or false - a vertical menu?
this.isVert = isVert;
// The popout indicator used (if any) for this menu.
this.popInd = popInd
// Position and size settings.
this.x = x;
this.y = y;
this.width = width;
// Colours of menu and items.
this.overCol = overCol;
this.backCol = backCol;
// The stylesheet class used for item borders and the text within items.
this.borderClass = borderClass;
this.textClass = textClass;
// Parent menu and item numbers, indexed later.
this.parentMenu = null;
this.parentItem = null;
// Reference to the object's style properties (set later).
this.ref = null;
}

function Item(text, href, frame, length, spacing, target) {
this.text = text;
this.href = href;
this.frame = frame;
this.length = length;
this.spacing = spacing;
this.target = target;
// Reference to the object's style properties (set later).
this.ref = null;
}

function writeMenus() {
if (!isDOM && !isIE4 && !isNS4) return;

for (currMenu = 0; currMenu < menu.length; currMenu++) with (menu[currMenu][0]) {
// Variable for holding HTML for items and positions of next item.
var str = '', itemX = 0, itemY = 0;

// Remember, items start from 1 in the array (0 is menu object itself, above).
// Also use properties of each item nested in the other with() for construction.
for (currItem = 1; currItem < menu[currMenu].length; currItem++) with (menu[currMenu][currItem]) {
var itemID = 'menu' + currMenu + 'item' + currItem;

// The width and height of the menu item - dependent on orientation!
var w = (isVert ? width : length);
var h = (isVert ? length : width);

// Create a div or layer text string with appropriate styles/properties.
// Thanks to Paul Maden (www.paulmaden.com) for helping debug this in IE4, apparently
// the width must be a miniumum of 3 for it to work in that browser.
if (isDOM || isIE4) {
str += '<div id="' + itemID + '" style="position: absolute; left: ' + itemX + '; top: ' + itemY + '; width: ' + w + '; height: ' + h + '; visibility: inherit; ';
if (backCol) str += 'background: ' + backCol + '; ';
str += '" ';
}
if (isNS4) {
str += '<layer id="' + itemID + '" left="' + itemX + '" top="' + itemY + '" width="' +  w + '" height="' + h + '" visibility="inherit" ';
if (backCol) str += 'bgcolor="' + backCol + '" ';
}
if (borderClass) str += 'class="' + borderClass + '" ';

// Add mouseover handlers and finish div/layer.
str += 'onMouseOver="popOver(' + currMenu + ',' + currItem + ')" onMouseOut="popOut(' + currMenu + ',' + currItem + ')">';

// Add contents of item (default: table with link inside).
// In IE/NS6+, add padding if there's a border to emulate NS4's layer padding.
// If a target frame is specified, also add that to the <a> tag.

str += '<table width="' + (w - 8) + '" border="0" cellspacing="0" cellpadding="' + (!isNS4 && borderClass ? 3 : 0) + '"><tr><td align="left" height="' + (h - 7) + '">' + '<a class="' + textClass + '" href="' + href + '"' + (frame ? ' target="' + frame + '">' : '>') + text + '</a></td>';
if (target > 0) {

// Set target's parents to this menu item.
menu[target][0].parentMenu = currMenu;
menu[target][0].parentItem = currItem;

// Add a popout indicator.
if (popInd) str += '<td class="' + textClass + '" align="right">' + popInd + '</td>';
}
str += '</tr></table>' + (isNS4 ? '</layer>' : '</div>');
if (isVert) itemY += length + spacing;
else itemX += length + spacing;
}
if (isDOM) {
var newDiv = document.createElement('div');
document.getElementsByTagName('body').item(0).appendChild(newDiv);
newDiv.innerHTML = str;
ref = newDiv.style;
ref.position = 'absolute';
ref.visibility = 'hidden';
}

// Insert a div tag to the end of the BODY with menu HTML in place for IE4.
if (isIE4) {
document.body.insertAdjacentHTML('beforeEnd', '<div id="menu' + currMenu + 'div" ' + 'style="position: absolute; visibility: hidden">' + str + '</div>');
ref = getSty('menu' + currMenu + 'div');
}

// In NS4, create a reference to a new layer and write the items to it.
if (isNS4) {
ref = new Layer(0);
ref.document.write(str);
ref.document.close();
}

for (currItem = 1; currItem < menu[currMenu].length; currItem++) {
itemName = 'menu' + currMenu + 'item' + currItem;
if (isDOM || isIE4) menu[currMenu][currItem].ref = getSty(itemName);
if (isNS4) menu[currMenu][currItem].ref = ref.document[itemName];
   }
}
with(menu[0][0]) {
ref.left = x;
ref.top = y;
ref.visibility = 'visible';
   }
}

//  ************************************************
//  Hieronder begint de menu-layout


var menu = new Array();

// kleur Menulijst origineel en mouseover 
var defBack ='#BBE8FF', defOver ='#EDF7FF' ;

// Menulijst standaardhoogte (of breedte bij horizontaal menu)
var defLength = 20;

// Menu 0 is de eerste menubalk.
menu[0] = new Array();
// false geeft een horizontaal menu (geen popout indicator).
// positie van eerste hoofditem (nu horiz 11, vert 20 en 17px hoog).
// achtergrondkleur over, achtergrondkleur uit,?,style
menu[0][0] = new Menu(false, '', 11, 20, 17, '#FFFFFF', '', '', 'itemHoofdText');
// Tekst op de hoofdmenubalk
// 'tekst', link, target, lengte, tussenruimte,submenunummer.
menu[0][1] = new Item('Behang kiezen', 'Kiezen-Soorten.htm', '', 75, 0, 1);
menu[0][2] = new Item('Benodigdheden', 'Benodigdheden.htm',  '', 70, 5, 2);
menu[0][3] = new Item('De muur', 'Muur-Voorbereiden.htm',    '', 55, 0, 3);
menu[0][4] = new Item('Knippen', 'Behang-Knippen.htm',       '', 55, 0, 4);
menu[0][5] = new Item('Lijm', 'Lijm-Aanmaken.htm',           '', 40, 0, 5);
menu[0][6] = new Item('Plakken', 'Behang-Plakken.htm',       '', 60, 0, 6);
menu[0][7] = new Item('"Hindernis plakken"', 'Hindernis-Hoeken.htm', '', 90, 0, 7);


// Eerste submenu Behang kiezen.
menu[1] = new Array();
// True = verticaal menu, '>' als popout indicator. mag ook image zijn
// Verschuiving horiz. 0px, vert. 21, breedte 80, acht.gr.kleur, css-styl.
menu[1][0] = new Menu(true, '', 0, 21, 80, defOver, defBack, 'itemBorder', 'itemText');
// Label, link, targetframe, hoogte, ruimte tot volgende item, targetmenu
menu[1][1] = new Item('Soorten', 'Kiezen-Soorten.htm', '', defLength, 0, 0);
menu[1][2] = new Item('Dessins', 'Kiezen-Dessins.htm', '', defLength, 0, 0);
menu[1][3] = new Item('Randen', 'Kiezen-Randen.htm', '', defLength, 0, 0);
menu[1][4] = new Item('Symbolen op de verpakking', 'Kiezen-Merktekens.htm', '', 35, -1, 0);
menu[1][5] = new Item('Hoeveel rollen heb ik nodig?', 'Kiezen-HoeveelBehang1soort.htm', '', 35, 0, 8);

// Tweede submenu Benodigdheden.
menu[2] = new Array();
menu[2][0] = new Menu(true, '>', 0, 21, 85, defOver, defBack, 'itemBorder', 'itemText80');
menu[2][1] = new Item('Bij voorbereiding en behangen', 'Benodigdheden.htm', '', 35, -1, 0);


// Derde submenu De muur
menu[3] = new Array();
menu[3][0] = new Menu(true, '<', 0, 21, 80, defOver, defBack, 'itemBorder', 'itemText80');
menu[3][1] = new Item('Voorbereiden', 'Muur-Voorbereiden.htm', '', defLength, -1, 0);
menu[3][2] = new Item('Verwijderen oud behang ', 'Muur-OudBehang.htm', '', 35, -1, 0);
menu[3][3] = new Item('Gladmaken', 'Muur-Gladmaken.htm', '', defLength, 0, 0);
menu[3][4] = new Item('Verwijderen stopcontacten en schakelaars', 'Muur-VerwijderenStopcontact.htm', '', 50, -1, 0);
menu[3][5] = new Item('Voorstrijken', 'Muur-Voorstrijken.htm', '', 25, 0, 0);

// Vijfde submenu Knippen
menu[4] = new Array();
menu[4][0] = new Menu(true, '<', 0, 21, 80, defOver, defBack, 'itemBorder', 'itemText');
menu[4][1] = new Item('Banen knippen', 'Behang-Knippen.htm', '', 25, 0, 0);

// Vierde submenu Lijm
menu[5] = new Array();
menu[5][0] = new Menu(true, '<', 0, 21, 70, defOver, defBack, 'itemBorder', 'itemText60');
menu[5][1] = new Item('De juiste lijm', 'Lijm-Aanmaken.htm', '', defLength, 0, 0);
menu[5][2] = new Item('Aanmaken', 'Lijm-Aanmaken.htm', '', defLength, 0, 0);
menu[5][3] = new Item('Insmeren', 'Lijm-Insmeren.htm', '', defLength, 0, 0);
menu[5][4] = new Item('Inweken', 'Lijm-Inweken.htm', '', 25, 0, 0);


// Zesde submenu Plakken
menu[6] = new Array();
menu[6][0] = new Menu(true, '<', 0, 21, 100, defOver, defBack, 'itemBorder', 'itemText80');
menu[6][1] = new Item('Werkvolgorde', 'Behang-Plakken.htm', '', defLength, 0, 0);
menu[6][2] = new Item('Loodlijn zetten', 'Behang-Plakken.htm#Loodlijn', '', defLength, 0, 0);
menu[6][3] = new Item('Een goed begin...', 'Behang-Beginnen.htm', '', defLength, 0, 0);
menu[6][4] = new Item('Secuur aandrukken', 'Behang-Aandrukken.htm', '', 35, -1, 0);
menu[6][5] = new Item('Mooie naden', 'Behang-Naden.htm', '', defLength, 0, 0);
menu[6][6] = new Item('Afknippen overtollig behang', 'Behang-AfknippenOvertollig.htm', '', 35, -1, 0);
menu[6][7] = new Item('Gelijkmatig drogen', 'Behang-Drogen.htm', '', 25, 0, 0);


// Zevende submenu Hindernisplakken
menu[7] = new Array();
menu[7][0] = new Menu(true, '<', 0, 21, 90, defOver, defBack, 'itemBorder', 'itemText');
menu[7][1] = new Item('Hoeken', 'Hindernis-Hoeken.htm', '', defLength, 0, 0);
menu[7][2] = new Item('Langs kozijnen', 'Hindernis-Kozijnen.htm', '', defLength, 0, 0);
menu[7][3] = new Item('Stopcontacten en schakelaars', 'Hindernis-Stopcontact.htm', '', 35, -1, 0);
menu[7][4] = new Item('Vensters en dakramen', 'Hindernis-Vensters.htm', '', 35, -1, 0);
menu[7][5] = new Item('Uitsteeksels', 'Hindernis-Uitsteeksels.htm', '', 25, -1, 0);
menu[7][6] = new Item('Trappenhuizen', 'Hindernis-Trappenhuis.htm', '', defLength, 0, 0);
menu[7][7] = new Item('Radiatoren', 'Hindernis-RadiatorBoog.htm', '', defLength, 0, 0);
menu[7][8] = new Item('Bogen en togen', 'Hindernis-RadiatorBoog.htm', '', defLength, -1, 0);

// Achtste submenu Berekenen
menu[8] = new Array();
menu[8][0] = new Menu(true, '>', 80, 0, 100, defOver, defBack, 'itemBorder', 'itemText100');
menu[8][1] = new Item('Ik plak één dessin', 'Kiezen-HoeveelBehang1soort.htm', '', defLength, 0, 0);
menu[8][2] = new Item('Ik plak twee dessins met rand ertussen', 'Kiezen-HoeveelBehang2soorten.htm', '', defLength, 0, 0);