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;
newCol = isOver ? menu[menuCount][changeArray[menuCount]].overCol : menu[menuCount][changeArray[menuCount]].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, overCol, backCol)  {
this.text = text;
this.href = href;
this.frame = frame;
this.overCol = overCol;
this.backCol = backCol;
if ((text == 'Plasma Display Panels - Touch Panels, Cyberboards') || (text == 'ODR (Optical Digital Reference)  Systems'))
  this.length = 38;
else
  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]) {


	textClass = 'itemText'; 
    if (currMenu == 0) {

      if (currItem == MainCatPos1 + 1) {
        // The width and height of the menu item - dependent on orientation!
        var w = (isVert ? width : length);
        var h = (isVert ? length : width);
        str += '<div style="border-color : #D6D6D6 #D6D6D6 #F1F1F1 #D6D6D6; border-style : solid; border-width : 1px; z-index: 10; position: absolute; left: ' + itemX + '; top: ' + itemY + '; width: ' + w + '; height: ' + h + '; visibility: inherit; "';
        str += '><Img Src="../images/LeftTop.gif" width="143" height="35"></div>';
        if (isVert) itemY += length;
        else itemX += length;
      }
    }


   if (currMenu == 0) 
     test = '<img src="../images/arrowBlue.gif" border=0>&nbsp;&nbsp;';
   else
     test = '';






    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="z-index: 10; position: absolute; left: ' + itemX + '; top: ' + itemY + '; width: ' + w + ';       height: ' + h + '; visibility: inherit; ';
      if (backCol) str += 'background: ' + backCol + '; ';
      str += '" ';
      if (backCol == '#D2EFD1') textClass = 'itemtext';     
    }
    if (isNS4) {
      str += '<layer id="' + itemID + '" z-index="10" 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 + '">' : '><div style="width='+(w - 8)+'">') + text + '</div></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.
   	  str += '<table width="' + (w) + '" style="border-color : #F1F1F1 #D6D6D6 #D6D6D6 #D6D6D6; border-style : solid; border-width : 1px;" cellspacing="0" cellpadding="' + (!isNS4 && borderClass ? 3 : 0) + '"><tr><td align="left" height="' + (h - 2) + '">' + '<a class="' + textClass + '" href="' + href + '"' + (frame ? ' target="' + frame + '">' : '>') + test + text + '</a></td>';
      if (popInd) str += '<td class="' + textClass + '" align="right">' + popInd + '</td>';
    }
	else {
      str += '<table width="' + (w) + '" style="border-color : #F1F1F1 #D6D6D6 #D6D6D6 #D6D6D6; border-style : solid; border-width : 1px;" cellspacing="0" cellpadding="' + (!isNS4 && borderClass ? 3 : 0) + '"><tr><td align="left" height="' + (h - 2) + '">' + '<a class="' + textClass + '" href="' + href + '"' + (frame ? ' target="' + frame + '">' : '><div cursor:hand; width:'+(w - 8)+';">') + test + text +'</div></a></td>';
	}
	       
    str += '</tr></table>' + (isNS4 ? '</layer>' : '</div>');
    if (isVert) itemY += length + spacing;
    else itemX += length + spacing;
    
      if ((currMenu == 0) &&  (currItem == (menu[currMenu].length - 1))) {
        // The width and height of the menu item - dependent on orientation!
        var w = (isVert ? width : length);
        var h = (isVert ? length : width);
        str += '<div style="background-color : #F1F1F1; border-color : #F1F1F1 #D6D6D6 #D6D6D6 #D6D6D6; border-style : solid; border-width : 1px; z-index: 10; position: absolute; left: ' + itemX + '; top: ' + itemY + '; width: ' + w + '; height: 13; visibility: inherit; "';
        str += '><Img Src="../images/shim.gif" width=2>&nbsp;</div>';
        if (isVert) itemY += length;
        else itemX += length;
  }
  }
  
  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="z-index: 10; 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';
  }
}


function clickHandle(evt)
{
 if (isNS4) document.routeEvent(evt);
 hideAllBut(0);
}


// This is just the moving command for the example.

function moveRoot()
{
 with(menu[0][0].ref) left = ((parseInt(left) < 100) ? 100 : 5);
}