// Drop down menu library





// global menu state



var menuReady = false;



// precahe menubar image pairs



if(document.images) {



	var imagesNormal = new Array();

	imagesNormal["home"]= new Image(40,98);

	imagesNormal["home"].src = "images/home.jpg";

	imagesNormal["restaurant"]= new Image(40,99);

	imagesNormal["restaurant"].src = "images/restaurant.jpg";

	imagesNormal["pub"]= new Image(40,99);

	imagesNormal["pub"].src = "images/pub.jpg";

	imagesNormal["location"]= new Image(20,120);

	imagesNormal["location"].src = "images/location.jpg";

	imagesNormal["contact"]= new Image(20,120);

	imagesNormal["contact"].src = "images/contact.jpg";

	imagesNormal["jobs"]= new Image(20,120);

	imagesNormal["jobs"].src = "images/jobs.jpg";



	var imagesHilite = new Array();

	imagesHilite["home"]= new Image(40,98);

	imagesHilite["home"].src = "images/homeOn.jpg";

	imagesHilite["restaurant"]= new Image(40,99);

	imagesHilite["restaurant"].src = "images/restaurantOn.jpg";

	imagesHilite["pub"]= new Image(40,99);

	imagesHilite["pub"].src = "images/pubOn.jpg";

	imagesHilite["location"]= new Image(20,120);

	imagesHilite["location"].src = "images/locationOn.jpg";

	imagesHilite["contact"]= new Image(20,120);

	imagesHilite["contact"].src = "images/contactOn.jpg";

	imagesHilite["jobs"]= new Image(20,120);

	imagesHilite["jobs"].src = "images/jobsOn.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 style sheet attribute values

var CSSRuleValues = {menuItemHeight:"16px",

			menuItemLineHeight:"1.5 em",

			menuWrapperBorderWidth:"1px",

			menuWrapperPadding:"2px",

			defaultBodyFontSize:"12px"

		};







// specifications for menu contents and menubar image associations

var menus=new Array();

menus[0] = {mBarImgId:"menuImg_1",

	mBarImgNormal:imagesNormal["home"],

	mBarImgHilite:imagesHilite["home"],

	menuItems:[],

	elemId:""

	};

menus[1] = {mBarImgId:"menuImg_2",

	mBarImgNormal:imagesNormal["restaurant"],

	mBarImgHilite:imagesHilite["restaurant"],

	menuItems:[],

	elemId:""

	};

menus[2] = {mBarImgId:"menuImg_3",

	mBarImgNormal:imagesNormal["pub"],

	mBarImgHilite:imagesHilite["pub"],

	menuItems:[],

	elemId:""

	};

	

menus[3] = {mBarImgId:"menuImg_4",

	mBarImgNormal:imagesNormal["location"],

	mBarImgHilite:imagesHilite["location"],

	menuItems:[],

	elemId:""

	};

menus[4] = {mBarImgId:"menuImg_5",

	mBarImgNormal:imagesNormal["contact"],

	mBarImgHilite:imagesHilite["contact"],

	menuItems:[],

	elemId:""

	};

menus[5] = {mBarImgId:"menuImg_6",

	mBarImgNormal:imagesNormal["jobs"],

	mBarImgHilite:imagesHilite["jobs"],

	menuItems:[],

	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 initMenu(), generates the menu div elements and their contents

// this action is invisible to the 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; menuItemH *= 1.1;}

	// use menus array to drive div creation loop

	menuItemH += 1;

	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 handalers

		

		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;

			itemLink.style.border = "1 solid #660032";

			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;

}



// initialise global that helps manage menu hiding

var timer;



// invoked from mouseovers inside menus to cancel hide

// request from mouseout of menu bar image

function keepMenu() {

	clearTimeout(timer);

}



function cancelAll(){

	keepMenu();

	menuReady = false;

}

// invoked from mouse outs to request hiding menus

// in 1/4 second, unless canceled

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;

			}

		}

	}

}



// create menus only if key items are supported

function initMenus(){

	if(document.getElementById && document.styleSheets) {

		setTimeout("makeMenus()", 5);

		window.onunload=cancelAll;

	}

}