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 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.
// 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 valign="middle" align="center" 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';
   }
/*	Place call to scrolling banner fcn here	*/	
}

// 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');

// 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);


var menu = new Array();

// 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 = '#74aec1', defBack = '#134972';

// Default 'length' of menu items - item height if menu is vertical, width if horizontal.
var defLength = 22;

// Menu 0 is the special, 'root' menu from which everything else arises.
menu[0] = new Array();