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;

    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';

      }

   with(menu[1][0]) {

   ref.left = x;

   ref.top = y;

   ref.visibility = 'hidden';

      }

   with(menu[2][0]) {

   ref.left = x;

   ref.top = y;

   ref.visibility = 'hidden';

      }

   with(menu[3][0]) {

   ref.left = x;

   ref.top = y;

   ref.visibility = 'hidden';

      }

   with(menu[4][0]) {

   ref.left = x;

   ref.top = y;

   ref.visibility = 'hidden';

      }

   with(menu[5][0]) {

   ref.left = x;

   ref.top = y;

   ref.visibility = 'hidden';

      }

   with(menu[6][0]) {

   ref.left = x;

   ref.top = y;

   ref.visibility = 'hidden';

      }

   }

   

   // Syntaxes: *** START EDITING HERE, READ THIS SECTION CAREFULLY! ***

   //

   // menu[menuNumber][0] = new Menu(Vertical menu? (true/false), 'popout indicator', left, top,

   // width, 'mouseover colour', 'background colour', 'border stylesheet', 'text stylesheet');

   //

   // Left and Top are measured on-the-fly relative to the top-left corner of its trigger, or

   // for the root menu, the top-left corner of the page.

   //

   // menu[menuNumber][itemNumber] = new Item('Text', 'URL', 'target frame', length of menu item,

   //  additional spacing to next menu item, number of target menu to popout);

   //

   // If no target menu (popout) is desired, set it to 0. Likewise, if your site does not use

   // frames, pass an empty string as a frame target.

   //

   // Something that needs explaining - the Vertical Menu setup. You can see most menus below

   // are 'true', that is they are vertical, except for the first root menu. The 'length' and

   // 'width' of an item depends on its orientation -- length is how long the item runs for in

   // the direction of the menu, and width is the lateral dimension of the menu. Just look at

   // the examples and tweak the numbers, they'll make sense eventually :).

   

   var menu = new Array();

   var blank = "images/blank.gif";

   // Default colours passed to most menu constructors (just passed to functions, not

   // a global variable - makes things easier to change later in bulk).

   var defOver = '#D4E5FF', defBack = '#FFFFFF';

   

   // Default 'length' of menu items - item height if menu is vertical, width if horizontal.

   var defLength = 20;

   

   // Menu 0 is the special, 'root' menu from which everything else arises.

   menu[0] = new Array();

   // A non-vertical menu with a few different colours and no popout indicator, as an example.

   // *** MOVE ROOT MENU AROUND HERE ***  it's positioned at (5, 0) and is 17px high now.

   // set menu color

      menuover1=''

      menuback1= ''

   menu[0][0] = new Menu(false, '', 0, 83, 0, menuover1,menuback1, '', 'menumainlinks');

   // Notice how the targets are all set to nonzero values...

   // The 'length' of each of these items is 40, and there is spacing of 10 to the next item.

   // Most of the links are set to '#' hashes, make sure you change them to actual files.

   menu[0][1] = new Item('<img src="images/home/blank.gif" width="73" height="29" border="0">', '#', '', 73, 0, 1);

   menu[0][2] = new Item('<img src="images/home/blank.gif" width="287" height="1" border="0">', '#', '', 287, 0, 0);

   menu[0][3] = new Item('<img src="images/home/blank.gif" width="92" height="29" border="0">', '#', '', 92, 0, 4);

   menu[0][4] = new Item('<img src="images/home/blank.gif" width="85" height="1" border="0">', '#', '', 85, 0, 0);

   //menu[0][5] = new Item('<img src="images/home/blank.gif" width="65" height="29" border="0">', '#', '', 85, 0, 5);





	// about us

   menu[1] = new Array();

   // The File menu is positioned 0px across and 22 down from its trigger, and is 80 wide.

   // All text in this menu has the stylesheet class 'item' -- see the <style> section above.

   // We've passed a 'greater-than' sign '>' as a popout indicator. Try an image...?

   menu[1][0] = new Menu(true, '<img src="images/home/bullet.gif" width="6" height="6" border="0" align="absmiddle">', 0, 26, 150, defOver, defBack, 'itemBorder', 'itemText');

   menu[1][1] = new Item('Overview', 'aboutus.html', '', defLength, 0, 0);

  // menu[1][2] = new Item('Know Your Doctor', '#', '', defLength, 0, 2);

   menu[1][2] = new Item('Our Mission & Activities', '#', '', defLength, 0, 3);

   //menu[1][3] = new Item('Our Activities', 'activities.html', '', defLength, 0, 0);

   menu[1][3] = new Item('Know Your Doctor', 'knowyourdoctors.html', '', defLength, 0, 0);

   menu[1][4] = new Item('Dedication', 'dedication.html', '', defLength, 0, 0);

   menu[1][5] = new Item('Low Vision Services', 'pediatric_services.html', '', defLength, 0, 0);   

   // Edit menu.

   menu[2] = new Array();

   menu[2][0] = new Menu(true, '>', 125, 5, 150, defOver, defBack, 'itemBorder', 'itemText');

   menu[2][1] = new Item('Overview', 'knowyourdoctor.html', '', defLength, 0, 0);

//   menu[2][2] = new Item('Curriculum Vitae', 'curriculum_vitae.html', '', defLength, 0, 0);

   menu[2][2] = new Item('Message from Your Doctor', 'message_doctor.html', '', defLength, 0, 0);

  // menu[2][4] = new Item('ORBIS Faculty', 'orbisfaculty.html', '', defLength, 0, 0);

   

   // Help menu

   menu[3] = new Array();

   menu[3][0] = new Menu(true, '>', 127, 5, 90, defOver, defBack, 'itemBorder', 'itemText');

   menu[3][1] = new Item('Activities', 'activities.html', '', defLength, 0, 0);

   menu[3][2] = new Item('Vision 2020', 'vision.html', '', defLength, 0, 0);

   menu[3][3] = new Item('ORBIS', 'orbisfaculty.html', '', defLength, 0, 0);

  

   

  // menu[3] = new Array();

  // menu[3][0] = new Menu(true, '>', 125, 5, 195, defOver, defBack, 'itemBorder', 'itemText');

   //menu[3][1] = new Item('Elimination of Childhood Blindness', 'eli_childhood.html', '', defLength, 0, 0);

   //menu[3][2] = new Item('Vision 2020', 'vision.html', '', defLength, 0, 0);

       // subscription  menu

   menu[4] = new Array();

   // This is across but not down... a horizontal popout (with crazy stylesheets :)...

   menu[4][0] = new Menu(true, '', 0, 26, 220, defOver, defBack, 'itemBorder', 'itemText');

   // These items are lengthier than normal, and have extra spacing due to the fancy borders.

   menu[4][1] = new Item('Squint (Crossed Eyes)', 'squint.html', '',defLength, 0, 0);

   menu[4][2] = new Item('Refractive Error (Eye Glasses)', 'refractive.html', '',defLength, 0, 0);

   menu[4][3] = new Item('Amblyopia (Lazy Eyes)', 'amblyopia.html', '',defLength, 0, 0);

   menu[4][4] = new Item('Childhood Cataract', 'childhood_cataract.html', '', defLength, 0, 0);

   menu[4][5] = new Item('Watering of Eyes (CNLDO)', 'wateringeye.html', '', defLength, 0, 0);

   menu[4][6] = new Item('Allergic Conjunctivitis', 'allergic_conjunctivitis.html', '', defLength, 0, 0);

   menu[4][7] = new Item('Eye Disease of Premature Children', 'eyedis.html', '', defLength, 0, 0);

   menu[4][8] = new Item('Other Common Eye Diseases in Children', 'othereye.html', '', defLength, 0, 0);

   



	menu[5] = new Array();

   // This is across but not down... a horizontal popout (with crazy stylesheets :)...

   menu[5][0] = new Menu(true, '', 0, 26, 90, defOver, defBack, 'itemBorder', 'itemText');

   // These items are lengthier than normal, and have extra spacing due to the fancy borders.

  // menu[5][1] = new Item('Picture Gallery', 'pic_gallery.html', '',defLength, 0, 0);

  // menu[5][2] = new Item('Video Gallery', 'video_gallery.html', '',defLength, 0, 0);

   

   menu[6] = new Array();

   // This is across but not down... a horizontal popout (with crazy stylesheets :)...

   menu[6][0] = new Menu(true, '', 0, 16, 112, defOver, defBack, 'itemBorder', 'itemText');

   // These items are lengthier than normal, and have extra spacing due to the fancy borders.

   menu[6][1] = new Item('Infant Feeding Tube', '#', '',defLength, 0, 0);

   menu[6][2] = new Item('Ryle\'s Tube', '#', '',defLength, 0, 0);

   menu[6][3] = new Item('Levin\'s Tube', '#', '',defLength, 0, 0);

   menu[6][4] = new Item('Kehr\'s T-Tube', '#', '', defLength, 0, 0);

   



   

   

  // These two lines handle the window resize bug in NS4. See <body onResize="...">.

   // I recommend you leave this here as otherwise when you resize NS4's width menus are hidden.

   

   var popOldWidth = window.innerWidth;

   nsResizeHandler = new Function('if (popOldWidth != window.innerWidth) location.reload()');

   

   // This is a quick snippet that captures all clicks on the document and hides the menus

   // every time you click. Use if you want.

   

   if (isNS4) document.captureEvents(Event.CLICK);

   //document.onclick = clickHandle;

   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);

   }