// global menu state
var menuReady = false;

// pre-cache menubar image pairs
if (document.images) {
	var imagesNormal = new Array();
	imagesNormal["ourServices"] = new Image(20, 100);
	imagesNormal["ourServices"].src  = rootdir + "images/ourServices_off.jpg";
	imagesNormal["products"] = new Image(20, 100);
	imagesNormal["products"].src  = rootdir + "images/products_off.jpg";
	imagesNormal["hotelServices"] = new Image(20, 100);
	imagesNormal["hotelServices"].src  = rootdir + "images/hotelServices_off.jpg";
	imagesNormal["aboutUs"] = new Image(20, 100);
	imagesNormal["aboutUs"].src  = rootdir + "images/aboutUs_off.jpg";

	var imagesHilite = new Array();
	imagesHilite["ourServices"] = new Image(20, 100);
	imagesHilite["ourServices"].src  = rootdir + "images/ourServices_on.jpg";
	imagesHilite["products"] = new Image(20, 100);
	imagesHilite["products"].src  = rootdir + "images/products_on.jpg";
	imagesHilite["hotelServices"] = new Image(20, 100);
	imagesHilite["hotelServices"].src  = rootdir + "images/hotelServices_on.jpg";
	imagesHilite["aboutUs"] = new Image(20, 100);
	imagesHilite["aboutUs"].src  = rootdir + "images/aboutUs_on.jpg";
}

function getElementStyle(elem, IEStyleProp, CSSStyleProp) {
	if (elem.currentStyle) {
		return elem.currentStyle[IEStyleProp];
	} else if (window.getComputedStyle) {
		var compStyle = window.getComputedStyle(elem, "");
		return compStyle.getPropertyValue(CSSStyleProp);
	}
	return "";
}

// carry over some critical menu style sheet attribute values
var CSSRuleValues = {menuItemHeight:"20px",
					 menuItemLineHeight:"1.4em",
					 menuWrapperBorderWidth:"2px",
					 menuWrapperPadding:"3px",
					 defaultBodyFontSize:"12px"
					};

// specifications for menu contents and menubar image associations
var menus = new Array();

menus[0] = {
			mBarImgId:"menuImg_1",
			mBarImgNormal:imagesNormal["ourServices"],
			mBarImgHilite:imagesHilite["ourServices"],
			menuItems:[
				{text:"Acne", href:rootdir + "treatments/acne.html"},
				{text:"Photo Rejuvenation", href:rootdir + "treatments/photorejuvenation.html"},
				{text:"Laser Hair Removal", href:rootdir + "treatments/laserhair.html"},
				{text:"Laser Spider Veins", href:rootdir + "treatments/laserspiderveins.html"},
				{text:"Age Spots", href:rootdir + "treatments/agespots.html"},
				{text:"Sun Damage", href:rootdir + "treatments/sundamage.html"},
				{text:"Botox", href:rootdir + "treatments/botox.html"},
				{text:"Restylane", href:rootdir + "treatments/restylane.html"},
				{text:"Pigmentation", href:rootdir + "treatments/pigmentation.html"},
				{text:"Benign Skin Lesions", href:rootdir + "treatments/benignskinlesions.html"},
				{text:"Facials", href:rootdir + "treatments/facials.html"},
				{text:"Massage", href:rootdir + "treatments/massage.html"}
			],
			elemId:""
		   };

menus[1] = {
			mBarImgId:"menuImg_2",
			mBarImgNormal:imagesNormal["products"],
			mBarImgHilite:imagesHilite["products"],
			menuItems:[
				{text:"BelleDerm", href:rootdir + "products/bellederm.html"},
				{text:"Jane Iredale", href:rootdir + "products/janeiredale.html"},
				{text:"Procyte", href:rootdir + "products/procyte.html"},
				{text:"Oceanside", href:rootdir + "products/oceansidehomebrand.html"}
			],
			elemId:""
		   };

menus[2] = {
			mBarImgId:"menuImg_3",
			mBarImgNormal:imagesNormal["hotelServices"],
			mBarImgHilite:imagesHilite["hotelServices"],
			menuItems:[
			],
			elemId:""
		   };

menus[3] = {
			mBarImgId:"menuImg_4",
			mBarImgNormal:imagesNormal["aboutUs"],
			mBarImgHilite:imagesHilite["aboutUs"],
			menuItems:[
				{text:"About Us", href:rootdir + "aboutus/aboutus.html"},
				{text:"Mission Statement", href:rootdir + "aboutus/missionstatement.html"},
				{text:"Our Staff", href:rootdir + "aboutus/ourstaff.html"},
				{text:"Contact Us", href:rootdir + "aboutus/contact.html"},
				{text:"Appointments", href:rootdir + "aboutus/appointments.html"}
			],
			elemId:""
		   };


// create hash table-like lookup for menu objects with id string indexes
function makeHashes() {
	for (var i = 0; i < menus.length; i++) {
		menus[menus[i].elemId] = menus[i];
		menus[menus[i].mBarImgId] = menus[i];
	}
}

// assign menu label image event handlers
function assignLabelEvents() {
	var elem;
	for (var i = 0; i < menus.length; i++) {
		elem = document.getElementById(menus[i].mBarImgId);
		elem.onmouseover = swap;
		elem.onmouseout = swap;
	}
}

// invoked from init(), generates the menu div elements and their contents.
// all this action is invisible to user during construction
function makeMenus() {
	var menuDiv, menuItem, itemLink, mbarImg, textNode, offsetLeft, offsetTop;
	
	// determine key adjustment factors for the total height of menu divs
	
	var menuItemH = 0;
	var bodyFontSize = parseInt(getElementStyle(document.body, "fontSize", "font-size"));
	// test to see if browser's font size has been adjusted by the user
	// and that the new size registers as an applied style property
	if (bodyFontSize == parseInt(CSSRuleValues.defaultBodyFontSize)) {
		menuItemH = (parseFloat(CSSRuleValues.menuItemHeight));
	} else {
		// works nicely in Netscape 7
		menuItemH = parseInt(parseFloat(CSSRuleValues.menuItemLineHeight) * bodyFontSize);
	}
	var heightAdjust = parseInt(CSSRuleValues.menuWrapperPadding) + 
		parseInt(CSSRuleValues.menuWrapperBorderWidth);
	if (navigator.appName == "Microsoft Internet Explorer" && 
		navigator.userAgent.indexOf("Win") != -1 && 
		(typeof document.compatMode == "undefined" || 
		document.compatMode == "BackCompat")) {
		heightAdjust = -heightAdjust;
	}
	
	// use menus array to drive div creation loop
	for (var i = 0; i < menus.length; i++) {
		menuDiv = document.createElement("div");
		menuDiv.id = "popupmenu" + i;
		// preserve menu's ID as property of the menus array item
		menus[i].elemId = "popupmenu" + i;
		menuDiv.className = "menuWrapper";
		if (menus[i].menuItems.length > 0) {
			menuDiv.style.height = (menuItemH * menus[i].menuItems.length) - 
			heightAdjust + "px";
		} else {
			// don't display any menu div lacking menu items
			menuDiv.style.display = "none";
		}
		// define event handlers
		menuDiv.onmouseover = keepMenu;
		menuDiv.onmouseout = requestHide;

		// set stacking order in case other layers are around the page
		menuDiv.style.zIndex = 1000;
		
		// assemble menu item elements for inside menu div
		for (var j = 0; j < menus[i].menuItems.length; j++) {
			menuItem = document.createElement("div");
			menuItem.id = "popupmenuItem_" + i + "_" + j;
			menuItem.className = "menuItem";
			menuItem.onmouseover = toggleHighlight;
			menuItem.onmouseout = toggleHighlight;
			menuItem.onclick = hideMenus;
			menuItem.style.top = menuItemH * j + "px";
			itemLink = document.createElement("a");
			itemLink.href = menus[i].menuItems[j].href;
			itemLink.className = "menuItem";
			itemLink.onmouseover = toggleHighlight;
			itemLink.onmouseout = toggleHighlight;
			textNode = document.createTextNode(menus[i].menuItems[j].text);
			itemLink.appendChild(textNode);
			menuItem.appendChild(itemLink);
			menuDiv.appendChild(menuItem);
		}
		// append each menu div to the body
		document.body.appendChild(menuDiv);
	}
	makeHashes();
	assignLabelEvents();
	// pre-position menu
	for (i = 0; i < menus.length; i++) {
		positionMenu(menus[i].elemId);
	}
	menuReady = true;
}

// initialize global that helps manage menu hiding
var timer;

// invoked from mouseovers inside menus to cancel hide
// request from mouseout of menu bar image et al.
function keepMenu() {
	clearTimeout(timer);
}

function cancelAll() {
	keepMenu();
	menuReady = false;
}

// invoked from mouseouts to request hiding all menus
// in 1/4 second, unless cancelled
function requestHide() {
	timer = setTimeout("hideMenus()", 250);
}

// "brute force" hiding of all menus and restoration
// of normal menu bar images
function hideMenus() {
	for (var i = 0; i < menus.length; i++) {
	   document.getElementById(menus[i].mBarImgId).src = menus[i].mBarImgNormal.src;
	   var menu = document.getElementById(menus[i].elemId)
	   menu.style.visibility = "hidden";
	}
}

// set menu position just before displaying it
function positionMenu(menuId){
	// use the menu bar image for position reference of related div
	var mBarImg = document.getElementById(menus[menuId].mBarImgId);
	var offsetTrail = mBarImg;
	var offsetLeft = 0;
	var offsetTop = 0;
	while (offsetTrail) {
		offsetLeft += offsetTrail.offsetLeft;
		offsetTop += offsetTrail.offsetTop;
		offsetTrail = offsetTrail.offsetParent;
	}
	if (navigator.userAgent.indexOf("Mac") != -1 && 
		typeof document.body.leftMargin != "undefined") {
		offsetLeft += document.body.leftMargin;
		offsetTop += document.body.topMargin;
	}
	var menuDiv = document.getElementById(menuId);
	menuDiv.style.left = offsetLeft + "px";
	menuDiv.style.top = offsetTop + mBarImg.height + "px";
}

// display a particular menu div
function showMenu(menuId) {
	if (menuReady) {
		keepMenu();
		hideMenus();
		positionMenu(menuId);
		var menu = document.getElementById(menuId);
		menu.style.visibility = "visible";
	}
}

// menu bar image swapping, invoked from mouse events in menu bar
// swap style sheets for menu items during rollovers
function toggleHighlight(evt) {
	evt = (evt) ? evt : ((event) ? event : null);
	if (typeof menuReady != "undefined") {
		if (menuReady && evt) {
			var elem = (evt.target) ? evt.target : evt.srcElement;
			if (elem.nodeType == 3) {
				elem = elem.parentNode;
			}
			if (evt.type == "mouseover") {
				keepMenu();
				elem.className ="menuItemOn";
			} else {
				elem.className ="menuItem";
				requestHide();
			}
			evt.cancelBubble = true;
		}
	}
}

function swap(evt) {
	evt = (evt) ? evt : ((event) ? event : null);
	if (typeof menuReady != "undefined") {
		if (evt && (document.getElementById && document.styleSheets) && menuReady) {
			var elem = (evt.target) ? evt.target : evt.srcElement;
			if (elem.className == "menuImg") {
				if (evt.type == "mouseover") {
					showMenu(menus[elem.id].elemId);
					elem.src = menus[elem.id].mBarImgHilite.src;
				} else if (evt.type == "mouseout") {
					requestHide();
				}
				evt.cancelBubble = true;
			}
		}
	}
}

// create menus only if key items are supported
function initMenus() {
	if (document.getElementById && document.styleSheets) {
		setTimeout("makeMenus()", 5);
		window.onunload=cancelAll;
	}
}