// +------------------------------------------------------------+
// | yx_menu                         Version 3                  |
// | Copyright 1999  Xin Yang        yangxin@iname.com          |
// | Created 11/01/1999              Last Modified 04/11/2000   |
// | Web Site:                       http://yx.webprovider.com  |
// +------------------------------------------------------------+
// | Copyright 1999,2000  Xin Yang   All Rights Reserved.       |
// +------------------------------------------------------------+
// | For personal purpose, send me your URL and put a link back |
// | to my web site, then you can use this script free.         |
// |                                                            |
// | For commercial purpose, obtain quotation for referencing,  |
// | using, hosting, selling or distributing this script.       |
// |                                                            |
// | In all cases copyright must remain intact.                 |
// +------------------------------------------------------------+

// Script begins

var isIE4 = false;
var isNN4 = false;

var flagMenu = "M";
var flagLink = "L";
var flagCommand = "C";
var flagSeparator = "S";

var charWidth = 7; // character width
var charHeight = 15; // character height
var colorNormal = "#ccccff"; // menu pad color
var colorHighlighted = "#eeeeff"; // menu highlighted item color
var colorTopLine = "navy"; // separator upper line color
var colorBottomLine = "#ffffff"; // separator lower line color

var borderSize = 2;
var marginSize = 4;
var marginString = "  ";
var subMenuFlagSize = 4;
var menuHolder = "menuHolder";

var menuItemCount = -1;
var menuItem = new Array();
var menuFolderCount = -1;
var menuFolder = new Array();
var menuFolderSwitch = new Array();
var menuWidth = new Array();
var itemLayer = new Array();
var menuLayer = new Array();
var menuDone = new Array();

var itemOn = false;
var nnWidth = 0, nnHeight = 0;

function launchCommand(commandString) {
  eval(commandString);
}

function launchPage(pageURL) {
  document.location.assign(pageURL);
}

function clickMenu(itemIndex) {
  var menuIndex = menuItem[itemIndex].myFolder;
  var folderIndex = menuItem[itemIndex].folder;
  var itemX = menuItem[itemIndex].x;
  var itemY = menuItem[itemIndex].y;

  if (menuItem[itemIndex].type == flagMenu) {
    if (menuFolderSwitch[folderIndex])
      hideMenu(folderIndex)
    else
      showMenu(folderIndex,itemX + menuWidth[menuIndex] * charWidth + subMenuFlagSize,itemY);
  }
  else if (menuItem[itemIndex].type == flagLink) {
    hideSubMenu();
    launchPage(menuItem[itemIndex].url);
  }
  else if (menuItem[itemIndex].type == flagCommand) {
    hideSubMenu();
    launchCommand(menuItem[itemIndex].command);
  }
}

function mouseOver() {
  var itemIndex = this.itemIndex;
  var menuIndex = menuItem[itemIndex].myFolder;
  var menuLength = menuFolder[menuIndex].length;
  var folderIndex = menuItem[itemIndex].folder;
  var itemX = menuItem[itemIndex].x;
  var itemY = menuItem[itemIndex].y;
  var thisFolder = 0;
  var thisItem = 0;

  itemOn = true;

  if (menuItem[itemIndex].type != flagSeparator) {
    if (isIE4) {
      this.style.backgroundColor = colorHighlighted;
    }
    else if (isNN4) {
      this.document.bgColor = colorHighlighted;
    }
  }

  for (var i = 0; i < menuLength; i++) {
    thisItem = menuFolder[menuIndex][i];
    
    if (thisItem != itemIndex)
      if (menuItem[thisItem].type == flagMenu) {
        thisFolder = menuItem[thisItem].folder;

        if (menuFolderSwitch[thisFolder])
          hideMenu(thisFolder);
      }
  }

  if (menuItem[itemIndex].type == flagMenu)
    if (!menuFolderSwitch[folderIndex])
      showMenu(folderIndex,itemX + menuWidth[menuIndex] * charWidth + subMenuFlagSize,itemY);

  window.status = menuItem[itemIndex].description;  
  return true;
}

function mouseOut() {
  itemOn = false;

  if (isIE4)
    this.style.backgroundColor = colorNormal
  else if (isNN4)
    this.document.bgColor = colorNormal;

  window.status = "";
}

function menuItemUnit() {
  this.type = "";
  this.name = "";
  this.description = "";
  this.url = "";
  this.command = "";
  this.menu = "";
  this.folder = -1;
  this.myFolder = -1;
  this.x = -1;
  this.y = -1;
}

function readMenu(menuName) {
  var menu = eval(menuName);
  var menuLength = menu.length
  var thisFolder = ++menuFolderCount;

  menuFolder[thisFolder] = new Array();
  menuFolderSwitch[thisFolder] = false;
  menuWidth[thisFolder] = 0;
  menuLayer[thisFolder] = false;
  menuDone[thisFolder] = false;

  for (var i = 0; i < menuLength; i++) {
    menuFolder[thisFolder][i] = ++menuItemCount;
    itemLayer[menuItemCount] = false;

    menuItem[menuItemCount] = new menuItemUnit();
    menuItem[menuItemCount].myFolder = thisFolder;
    menuItem[menuItemCount].type = menu[i][0];
    menuItem[menuItemCount].name = menu[i][1];
    menuItem[menuItemCount].description = menu[i][2];

    if (menuWidth[thisFolder] < (menuItem[menuItemCount].name.length + marginSize))
      menuWidth[thisFolder] = menuItem[menuItemCount].name.length + marginSize;

    if (menuItem[menuItemCount].type == flagMenu) {
      menuItem[menuItemCount].menu = menu[i][3];
      menuItem[menuItemCount].folder = menuFolderCount + 1;
      readMenu(menuItem[menuItemCount].menu);
    }
    else if (menuItem[menuItemCount].type == flagLink) {
      menuItem[menuItemCount].url = menu[i][3];
    }
    else if (menuItem[menuItemCount].type == flagCommand) {
      menuItem[menuItemCount].command = menu[i][3];
    }
    else if (menuItem[menuItemCount].type != flagSeparator) {
      alert("Menu Error");
    }
  }
}

function getItem(itemIndex,itemDimX,itemDimY,menuIndex) {
  var thisItem = null;
  var subMenuFlag = (menuItem[itemIndex].type == flagMenu)?"subMenu.gif":"onePixel.gif";
  var singleQuote = "'";
  var itemID = "item" + itemIndex + "";
  var layerString = '<div id="' + itemID + '" style="position:absolute; width:' + itemDimX + '; background-color:' + colorNormal + '; visibility:hidden;"></div>';
  var htmlString = (menuItem[itemIndex].type == flagSeparator)?('<table width=' + itemDimX +' height=2 cellpadding=0 cellspacing=0 border=0><tr align=left valign=bottom><td bgcolor=' + colorTopLine + '><img src="onePixel.gif" width=1 height=1 border=0></td></tr><tr align=left valign=top><td bgcolor=' + colorBottomLine + '><img src="onePixel.gif" width=1 height=1 border=0></td></tr></table>'):('<table width=' + itemDimX +' height=' + itemDimY + ' cellpadding=0 cellspacing=0 border=0><tr align=left valign=middle><td nowrap><span id="menuText"><a class="menu" href="javascript:clickMenu(' + itemIndex + ')" onMouseOver="window.status=' + singleQuote + menuItem[itemIndex].description + singleQuote + ';return true;">' + marginString + menuItem[itemIndex].name + marginString + '</a></span></td><td><img src="' + subMenuFlag + '" width=4 height=7 border=0 align=right></td></tr></table>');

  if (!itemLayer[itemIndex]) {
    itemLayer[itemIndex] = true;

    if (isIE4) {
      document.all[menuHolder].insertAdjacentHTML("BeforeEnd",layerString);
      thisItem = document.all[itemID];

      thisItem.innerHTML = htmlString;
      thisItem.style.zIndex = menuIndex * 2 + 1;

      thisItem.onmouseover = mouseOver;
      if (menuItem[itemIndex].type != flagSeparator)
        thisItem.onmouseout = mouseOut;

      thisItem.itemIndex = itemIndex;
    }
    else if (isNN4) {
      document.layers[itemID] = new Layer(itemDimX,document.layers[menuHolder]);
      thisItem = document.layers[itemID];

      thisItem.visibility = "hidden";
      thisItem.document.open();
      thisItem.document.writeln(htmlString);
      thisItem.document.close();
      thisItem.document.bgColor = colorNormal;
      thisItem.zIndex = menuIndex * 2 + 1;

      thisItem.onmouseover = mouseOver;
      if (menuItem[itemIndex].type != flagSeparator)
        thisItem.onmouseout = mouseOut;
      
      thisItem.itemIndex = itemIndex;
    }
  }
  
  return itemID;
}

function getMenu(menuIndex,menuDimX,menuDimY) {
  var menuID = "menu" + menuIndex + "";
  var menuPadX = menuDimX + borderSize * 2;
  var menuPadY = menuDimY + borderSize * 2;
  var layerString = '<div id="' + menuID + '" style="position:absolute; width:' + menuPadX + '; visibility:hidden;"></div>';
  var htmlString = '<table width=' + menuPadX +' height=' + menuPadY + ' cellpadding=0 cellspacing=0 border=' + borderSize + '><tr align=left valign=middle><td></td></tr></table>';

  if (!menuLayer[menuIndex]) {
    menuLayer[menuIndex] = true;

    if (isIE4) {
      document.all[menuHolder].insertAdjacentHTML("BeforeEnd",layerString);

      document.all[menuID].innerHTML = htmlString;
      document.all[menuID].style.zIndex = menuIndex * 2;
    }
    else if (isNN4) {
      document.layers[menuID] = new Layer(menuPadX,document.layers[menuHolder]);

      document.layers[menuID].visibility = "hidden";
      document.layers[menuID].zIndex = menuIndex * 2;
      document.layers[menuID].document.open();
      document.layers[menuID].document.writeln(htmlString);
      document.layers[menuID].document.close();
    }
  }
  
  return menuID;
}

function showLayer(layerID) {
  if (isIE4)
    document.all[layerID].style.visibility = "visible"
  else if (isNN4)
    document.layers[layerID].visibility = "show";
}

function hideLayer(layerID) {
  if (isIE4)
    document.all[layerID].style.visibility = "hidden"
  else if (isNN4)
    document.layers[layerID].visibility = "hidden";
}

function moveLayerTo(layerID,x,y) {
  if (isIE4) {
    document.all[layerID].style.pixelLeft = x;
    document.all[layerID].style.pixelTop = y;
  }
  else if (isNN4) {
    document.layers[layerID].left = x;
    document.layers[layerID].top = y;
  }
}

function hideMenu(menuIndex) {
  var menuLength = menuFolder[menuIndex].length;
  var menuID = getMenu(menuIndex,0,0);
  var itemID = "";
  var itemIndex = 0;

  for (var i = 0; i < menuLength; i++) {
    itemIndex = menuFolder[menuIndex][i];

    if (menuItem[itemIndex].type == flagMenu)
      if (menuFolderSwitch[menuItem[itemIndex].folder])
        hideMenu(menuItem[itemIndex].folder);

    itemID = getItem(itemIndex,0,0,0);
    hideLayer(itemID);
  }

  hideLayer(menuID);

  menuFolderSwitch[menuIndex] = false;
}

function hideSubMenu() {
  var menuLength = menuFolder[0].length;
  
  for (var i = 0; i < menuLength; i++) {
    itemIndex = menuFolder[0][i];

    if (menuItem[itemIndex].type == flagMenu) {
      if (menuFolderSwitch[menuItem[itemIndex].folder])
        hideMenu(menuItem[itemIndex].folder);
    }
  }
}

function showMenu(menuIndex,menuX,menuY) {
  var itemDimY = menuY;
  var menuLength = menuFolder[menuIndex].length;
  var menuDimX = menuWidth[menuIndex] * charWidth + subMenuFlagSize;
  var menuID = "";
  var itemID = "";
  var itemIndex = 0;

  if (!menuDone[menuIndex]) {
    for (var i = 0; i < menuLength; i++) {
      itemIndex = menuFolder[menuIndex][i];

      menuItem[itemIndex].x = menuX;
      menuItem[itemIndex].y = itemDimY;
      itemDimY +=  (menuItem[itemIndex].type != flagSeparator)?charHeight:2;

      itemID = getItem(itemIndex,menuDimX,charHeight,menuIndex);

      moveLayerTo(itemID,menuItem[itemIndex].x,menuItem[itemIndex].y);
    }

    menuID = getMenu(menuIndex,menuDimX,itemDimY-menuY);
    moveLayerTo(menuID,menuX-borderSize,menuY-borderSize);

    menuDone[menuIndex] = true;
  }

  for (var i = 0; i < menuLength; i++)
    showLayer(getItem(menuFolder[menuIndex][i],0,0,0));

  showLayer(getMenu(menuIndex,0,0));
  
  menuFolderSwitch[menuIndex] = true;
}

function getMenuSizeX(menuIndex) {
  var menuLength = menuFolder[menuIndex].length;
  var itemIndex = 0;
  var thisMenuDimX = menuWidth[menuIndex] * charWidth + subMenuFlagSize;
  var menuDimX = thisMenuDimX;
  var subMenuDimX = 0;

  for (var i = 0; i < menuLength; i++) {
    itemIndex = menuFolder[menuIndex][i];
    
    if (menuItem[itemIndex].type == flagMenu) {
      subMenuDimX = getMenuSizeX(menuItem[itemIndex].folder);

      if (menuDimX < (thisMenuDimX + subMenuDimX))
        menuDimX = thisMenuDimX + subMenuDimX;
    }
  }

  return menuDimX;
}

function getMenuSizeY(menuIndex) {
  var menuLength = menuFolder[menuIndex].length;
  var itemIndex = 0;
  var menuDimY = 0;
  var subMenuDimY = 0;
  var maxSubMenuDimY = 0;

  for (var i = 0; i < menuLength; i++) {
    itemIndex = menuFolder[menuIndex][i];
    
    if (menuItem[itemIndex].type == flagMenu) {
      subMenuDimY = getMenuSizeY(menuItem[itemIndex].folder);

      if (maxSubMenuDimY < (menuDimY + subMenuDimY))
        maxSubMenuDimY = menuDimY + subMenuDimY;
        
      menuDimY += charHeight;
    }
    else if (menuItem[itemIndex].type == flagSeparator)
      menuDimY += 2
    else
      menuDimY += charHeight;
  }

  if (menuDimY < maxSubMenuDimY)
    return maxSubMenuDimY
  else
    return menuDimY;
}

function setMenuSize(menuDimX,menuDimY) {
  document.layers[menuHolder].clip.width=menuDimX;
  document.layers[menuHolder].clip.height=menuDimY;
}

function buildMenu(menuName) {
  isIE4 = document.all;
  isNN4 = document.layers;

  var menuSizeX = 0;
  var menuSizeY = 0;

  if (isIE4 || isNN4) {
    readMenu(menuName);

    if (isNN4) {
      menuSizeX = getMenuSizeX(0) + borderSize * 2;
      menuSizeY = getMenuSizeY(0) + borderSize * 2;
      setMenuSize(menuSizeX,menuSizeY);

      nnWidth = window.innerWidth;
      nnHeight = window.innerHeight;

      window.onResize = reloadMenu;
    }

    showMenu(0,borderSize,borderSize);
    captureClick();
  }
}

function switchMenu() {
  if (!itemOn)
    hideSubMenu();

  return true;
}

function captureClick() {
  if (isIE4)
    document.onclick = switchMenu;
  else {
    document.onClick = switchMenu;
    document.captureEvents(Event.CLICK);
  }
}

function reloadMenu() {
  if (nnWidth != window.innerWidth || nnHeight != window.innerHeight)
    document.location.reload();
}

// Script ends