// -----------------------------------------------------------------------------------
//
//      Lightbox v2.03.3
//      by Lokesh Dhakar - http://www.huddletogether.com
//      5/21/06
//
//      For more information on this script, visit:
//      http://huddletogether.com/projects/lightbox2/
//
//      Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//      
//      Credit also due to those who have helped, inspired, and made their code available to the public.
//      Including: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), Thomas Fuchs(mir.aculo.us), and others.
//
//
// -----------------------------------------------------------------------------------
/*

        Table of Contents
        -----------------
        Configuration
        Global Variables

        Extending Built-in Objects      
        - Object.extend(Element)
        - Array.prototype.removeDuplicates()
        - Array.prototype.empty()

        Lightbox Class Declaration
        - initialize()
        - updateImageList()
        - start()
        - changeImage()
        - resizeImageContainer()
        - showImage()
        - updateDetails()
        - updateNav()
        - enableKeyboardNav()
        - disableKeyboardNav()
        - keyboardAction()
        - preloadNeighborImages()
        - end()
        
        Miscellaneous Functions
        - getPageScroll()
        - getPageSize()
        - getKey()
        - listenKey()
        - showSelectBoxes()
        - hideSelectBoxes()
        - showFlash()
        - hideFlash()
        - pause()
        - initLightbox()
        
        Function Calls
        - addLoadEvent(initLightbox)
        
*/
// -----------------------------------------------------------------------------------

//
//      Configuration
//
var fileLoadingImage = "lightbox/images/loading.gif";
var fileBottomNavCloseImage = "lightbox/images/closelabel.gif";

var overlayOpacity = 0.8;       // controls transparency of shadow overlay

var animate = true;			// toggles resizing animations
var resizeSpeed = 7;		// controls the	speed of the image resizing animations (1=slowest and 10=fastest)

var borderSize = 10;		//if you adjust	the padding in the CSS, you will need to update this variable

// -----------------------------------------------------------------------------------

//
//      Global Variables
//
var imageArray = new Array;
var activeImage;

if(animate == true){
        overlayDuration = 0.2;  // shadow fade in/out duration
        if(resizeSpeed > 10){ resizeSpeed = 10;}
        if(resizeSpeed < 1){ resizeSpeed = 1;}
        resizeDuration = (11 - resizeSpeed) * 0.15;
} else { 
        overlayDuration = 0;
        resizeDuration = 0;
}

// -----------------------------------------------------------------------------------

//
//      Additional methods for Element added by SU, Couloir
//      - further additions by Lokesh Dhakar (huddletogether.com)
//
Object.extend(Element, {
        getWidth: function(element) {
		element	= $(element);
		return element.offsetWidth; 
        },
        setWidth: function(element,w) {
		element	= $(element);
        element.style.width = w +"px";
        },
        setHeight: function(element,h) {
		element	= $(element);
        element.style.height = h +"px";
        },
        setTop: function(element,t) {
		element	= $(element);
        element.style.top = t +"px";
        },
        setLeft: function(element,l) {
		element	= $(element);
        element.style.left = l +"px";
        },
        setSrc: function(element,src) {
        element = $(element);
        element.src = src; 
        },
        setHref: function(element,href) {
        element = $(element);
        element.href = href; 
        },
        setInnerHTML: function(element,content) {
		element	= $(element);
		element.innerHTML = content;
        }
});

// -----------------------------------------------------------------------------------

//
//      Extending built-in Array object
//      - array.removeDuplicates()
//      - array.empty()
//
Array.prototype.removeDuplicates = function () {
    for(i = 0; i < this.length; i++){
        for(j = this.length-1; j>i; j--){        
	    if(this[i][0] == this[j][0]){
		this.splice(j,1);
	    }
        }
    }
}

// -----------------------------------------------------------------------------------

Array.prototype.empty = function () {
        for(i = 0; i <= this.length; i++){
		this.shift();
        }
}

// -----------------------------------------------------------------------------------

//
//      Lightbox Class Declaration
//      - initialize()
//      - start()
//      - changeImage()
//      - resizeImageContainer()
//      - showImage()
//      - updateDetails()
//      - updateNav()
//      - enableKeyboardNav()
//      - disableKeyboardNav()
//      - keyboardNavAction()
//      - preloadNeighborImages()
//      - end()
//
//      Structuring of code inspired by Scott Upton (http://www.uptonic.com/)
//
var Lightbox = Class.create();

Lightbox.prototype = {
        
        // initialize()
        // Constructor runs on completion of the DOM loading. Calls updateImageList and then
        // the function inserts html at the bottom of the page which is used to display the shadow 
        // overlay and the image container.
        //
        initialize: function() {        
	        
		this.updateImageList();

		// Code	inserts html at the bottom of the page that looks similar to this:
		//
		//	<div id="overlay"></div>
		//	<div id="lightbox">
		//		<div id="outerImageContainer">
		//			<div id="imageContainer">
		//				<img id="lightboxImage">
		//				<div style="" id="hoverNav">
		//					<a href="#" id="prevLink"></a>
		//					<a href="#" id="nextLink"></a>
		//				</div>
		//				<div id="loading">
		//					<a href="#" id="loadingLink">
		//						<img src="images/loading.gif">
		//					</a>
		//				</div>
		//			</div>
		//		</div>
		//		<div id="imageDataContainer">
		//			<div id="imageData">
		//				<div id="imageDetails">
		//					<span id="caption"></span>
		//					<span id="numberDisplay"></span>
		//				</div>
		//				<div id="bottomNav">
		//					<a href="#" id="bottomNavClose">
		//						<img src="images/close.gif">
		//					</a>
		//				</div>
		//			</div>
		//		</div>
		//	</div>


		var objBody = document.getElementsByTagName("body").item(0);
	        
		var objOverlay = document.createElement("div");
		objOverlay.setAttribute('id','overlay');
		objOverlay.style.display = 'none';
		objOverlay.onclick = function()	{ myLightbox.end(); }
		objBody.appendChild(objOverlay);
	        
		var objLightbox	= document.createElement("div");
		objLightbox.setAttribute('id','lightbox');
		objLightbox.style.display = 'none';
		objLightbox.onclick = function(e) {	// close Lightbox is user clicks shadow	overlay
			if (!e)	var e = window.event;
			var clickObj = Event.element(e).id;
			if ( clickObj == 'lightbox') {
				myLightbox.end();
		        }
		};
		objBody.appendChild(objLightbox);
		        
		var objOuterImageContainer = document.createElement("div");
		objOuterImageContainer.setAttribute('id','outerImageContainer');
		objLightbox.appendChild(objOuterImageContainer);

		// When	Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
		// If animations are turned off, it will be hidden as to prevent a flicker of a
		// white 250 by	250 box.
		if(animate){
			Element.setWidth('outerImageContainer',	250);
			Element.setHeight('outerImageContainer', 250);		        
		} else {
			Element.setWidth('outerImageContainer',	1);
			Element.setHeight('outerImageContainer', 1);		        
	        }

		var objImageContainer =	document.createElement("div");
		objImageContainer.setAttribute('id','imageContainer');
		objOuterImageContainer.appendChild(objImageContainer);
        
		var objLightboxImage = document.createElement("img");
		objLightboxImage.setAttribute('id','lightboxImage');
		objImageContainer.appendChild(objLightboxImage);
        
		var objHoverNav	= document.createElement("div");
		objHoverNav.setAttribute('id','hoverNav');
		objImageContainer.appendChild(objHoverNav);
        
		var objPrevLink	= document.createElement("a");
		objPrevLink.setAttribute('id','prevLink');
		objPrevLink.setAttribute('href','#');
		objHoverNav.appendChild(objPrevLink);
	        
		var objNextLink	= document.createElement("a");
		objNextLink.setAttribute('id','nextLink');
		objNextLink.setAttribute('href','#');
		objHoverNav.appendChild(objNextLink);
        
		var objLoading = document.createElement("div");
		objLoading.setAttribute('id','loading');
		objImageContainer.appendChild(objLoading);
        
		var objLoadingLink = document.createElement("a");
		objLoadingLink.setAttribute('id','loadingLink');
		objLoadingLink.setAttribute('href','#');
		objLoadingLink.onclick = function() { myLightbox.end();	return false; }
		objLoading.appendChild(objLoadingLink);
        
		var objLoadingImage = document.createElement("img");
		objLoadingImage.setAttribute('src', fileLoadingImage);
		objLoadingLink.appendChild(objLoadingImage);

		var objImageDataContainer = document.createElement("div");
		objImageDataContainer.setAttribute('id','imageDataContainer');
		objLightbox.appendChild(objImageDataContainer);

		var objImageData = document.createElement("div");
		objImageData.setAttribute('id','imageData');
		objImageDataContainer.appendChild(objImageData);
        
		var objImageDetails = document.createElement("div");
		objImageDetails.setAttribute('id','imageDetails');
		objImageData.appendChild(objImageDetails);
        
		var objCaption = document.createElement("span");
		objCaption.setAttribute('id','caption');
		objImageDetails.appendChild(objCaption);
        
		var objNumberDisplay = document.createElement("span");
		objNumberDisplay.setAttribute('id','numberDisplay');
		objImageDetails.appendChild(objNumberDisplay);
	        
		var objBottomNav = document.createElement("div");
		objBottomNav.setAttribute('id','bottomNav');
		objImageData.appendChild(objBottomNav);
        
		var objBottomNavCloseLink = document.createElement("a");
		objBottomNavCloseLink.setAttribute('id','bottomNavClose');
		objBottomNavCloseLink.setAttribute('href','#');
		objBottomNavCloseLink.onclick =	function() { myLightbox.end(); return false; }
		objBottomNav.appendChild(objBottomNavCloseLink);
        
		var objBottomNavCloseImage = document.createElement("img");
		objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage);
		objBottomNavCloseLink.appendChild(objBottomNavCloseImage);
        },


        //
        // updateImageList()
        // Loops through anchor tags looking for 'lightbox' references and applies onclick
        // events to appropriate links. You can rerun after dynamically adding images w/ajax.
        //
        updateImageList: function() {   
		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName('a');
		var areas = document.getElementsByTagName('area');

		// loop	through all anchor tags
		for (var i=0; i<anchors.length;	i++){
			var anchor = anchors[i];
		        
			var relAttribute = String(anchor.getAttribute('rel'));
		        
			// use the string.match() method to catch 'lightbox' references	in the rel attribute
			if (anchor.getAttribute('href')	&& (relAttribute.toLowerCase().match('lightbox'))){
				anchor.onclick = function () {myLightbox.start(this); return false;}
		        }
	        }

		// loop	through all area tags
		// todo: combine anchor	& area tag loops
		for (var i=0; i< areas.length; i++){
			var area = areas[i];
		        
			var relAttribute = String(area.getAttribute('rel'));
		        
			// use the string.match() method to catch 'lightbox' references	in the rel attribute
			if (area.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){
				area.onclick = function	() {myLightbox.start(this); return false;}
		        }
	        }
        },
        
        
        //
        //      start()
        //      Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
        //
        start: function(imageLink) {    

		hideSelectBoxes();
		hideFlash();

		// stretch overlay to fill page	and fade in
		var arrayPageSize = getPageSize();
		Element.setWidth('overlay', arrayPageSize[0]);
		Element.setHeight('overlay', arrayPageSize[1]);

		new Effect.Appear('overlay', { duration: overlayDuration, from:	0.0, to: overlayOpacity });

		imageArray = [];
		imageNum = 0;	        

		if (!document.getElementsByTagName){ return; }
		var anchors = document.getElementsByTagName( imageLink.tagName);

		// if image is NOT part	of a set..
		if((imageLink.getAttribute('rel') == 'lightbox')){
			// add single image to imageArray
			imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));		        
		} else {
		// if image is part of a set..

			// loop	through anchors, find other images in set, and add them to imageArray
			for (var i=0; i<anchors.length;	i++){
				var anchor = anchors[i];
				if (anchor.getAttribute('href')	&& (anchor.getAttribute('rel') == imageLink.getAttribute('rel'))){
					imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title')));
			        }
		        }
			imageArray.removeDuplicates();
			while(imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++;}
	        }

		// calculate top and left offset for the lightbox 
		var arrayPageScroll = getPageScroll();
		var lightboxTop	= arrayPageScroll[1] + (arrayPageSize[3] / 10);
		var lightboxLeft = arrayPageScroll[0];
		Element.setTop('lightbox', lightboxTop);
		Element.setLeft('lightbox', lightboxLeft);
	        
		Element.show('lightbox');
	        
		this.changeImage(imageNum);
        },

        //
        //      changeImage()
        //      Hide most elements and preload image in preparation for resizing image container.
        //
        changeImage: function(imageNum) {       
	        
		activeImage = imageNum;	// update global var

		// hide	elements during transition
		if(animate){ Element.show('loading');}
		Element.hide('lightboxImage');
		Element.hide('hoverNav');
		Element.hide('prevLink');
		Element.hide('nextLink');
		Element.hide('imageDataContainer');
		Element.hide('numberDisplay');	        
	        
		imgPreloader = new Image();
	        
		// once	image is preloaded, resize image container
		imgPreloader.onload=function(){
			Element.setSrc('lightboxImage',	imageArray[activeImage][0]);
			myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
		        
			imgPreloader.onload=function(){};	//	clear onLoad, IE behaves irratically with animated gifs	otherwise 
	        }
		imgPreloader.src = imageArray[activeImage][0];
        },

        //
        //      resizeImageContainer()
        //
        resizeImageContainer: function( imgWidth, imgHeight) {

		// get curren width and	height
		this.widthCurrent = Element.getWidth('outerImageContainer');
		this.heightCurrent = Element.getHeight('outerImageContainer');

		// get new width and height
		var widthNew = (imgWidth  + (borderSize	* 2));
		var heightNew =	(imgHeight  + (borderSize * 2));

		// scalars based on change from	old to new
		this.xScale = (	widthNew / this.widthCurrent) * 100;
		this.yScale = (	heightNew / this.heightCurrent) * 100;

		// calculate size difference between new and old image,	and resize if necessary
		wDiff =	this.widthCurrent - widthNew;
		hDiff =	this.heightCurrent - heightNew;

		if(!( hDiff == 0)){ new	Effect.Scale('outerImageContainer', this.yScale, {scaleX: false, duration: resizeDuration, queue: 'front'}); }
		if(!( wDiff == 0)){ new	Effect.Scale('outerImageContainer', this.xScale, {scaleY: false, delay: resizeDuration, duration: resizeDuration}); }

		// if new and old image	are same size and no scaling transition is necessary, 
		// do a	quick pause to prevent image flicker.
		if((hDiff == 0)	&& (wDiff == 0)){
			if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } else { pause(100);} 
	        }

		Element.setHeight('prevLink', imgHeight);
		Element.setHeight('nextLink', imgHeight);
		Element.setWidth( 'imageDataContainer',	widthNew);

		this.showImage();
        },
        
        //
        //      showImage()
        //      Display image and begin preloading neighbors.
        //
        showImage: function(){
		Element.hide('loading');
		new Effect.Appear('lightboxImage', { duration: resizeDuration, queue: 'end', afterFinish: function(){	myLightbox.updateDetails(); } });
		this.preloadNeighborImages();
        },

        //
        //      updateDetails()
        //      Display caption, image number, and bottom nav.
        //
        updateDetails: function() {
        
		// if caption is not null
		if(imageArray[activeImage][1]){
			Element.show('caption');
			Element.setInnerHTML( 'caption', imageArray[activeImage][1]);
	        }
	        
		// if image is part of set display 'Image x of x' 
		if(imageArray.length > 1){
			Element.show('numberDisplay');
			Element.setInnerHTML( 'numberDisplay', "Image "	+ eval(activeImage + 1) + " of " + imageArray.length);
	        }

		new Effect.Parallel(
			[ new Effect.SlideDown(	'imageDataContainer', { sync: true, duration: resizeDuration, from: 0.0, to: 1.0 }), 
			  new Effect.Appear('imageDataContainer', { sync: true,	duration: resizeDuration }) ], 
			{ duration: resizeDuration, afterFinish: function() {
				// update overlay size and update nav
				var arrayPageSize = getPageSize();
				Element.setHeight('overlay', arrayPageSize[1]);
				myLightbox.updateNav();
			        }
			} 
		);
        },

        //
        //      updateNav()
        //      Display appropriate previous and next hover navigation.
        //
        updateNav: function() {

		Element.show('hoverNav');			        

		// if not first	image in set, display prev image button
		if(activeImage != 0){
			Element.show('prevLink');
			document.getElementById('prevLink').onclick = function() {
				myLightbox.changeImage(activeImage - 1); return	false;
		        }
	        }

		// if not last image in	set, display next image button
		if(activeImage != (imageArray.length - 1)){
			Element.show('nextLink');
			document.getElementById('nextLink').onclick = function() {
				myLightbox.changeImage(activeImage + 1); return	false;
		        }
	        }
	        
		this.enableKeyboardNav();
        },

        //
        //      enableKeyboardNav()
        //
        enableKeyboardNav: function() {
		document.onkeydown = this.keyboardAction; 
        },

        //
        //      disableKeyboardNav()
        //
        disableKeyboardNav: function() {
		document.onkeydown = '';
        },

        //
        //      keyboardAction()
        //
        keyboardAction: function(e) {
		if (e == null) { // ie
			keycode	= event.keyCode;
			escapeKey = 27;
		} else { // mozilla
			keycode	= e.keyCode;
			escapeKey = e.DOM_VK_ESCAPE;
	        }

		key = String.fromCharCode(keycode).toLowerCase();
	        
		if((key	== 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){     // close lightbox
			myLightbox.end();
		} else if((key == 'p') || (keycode == 37)){	// display previous image
			if(activeImage != 0){
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage - 1);
		        }
		} else if((key == 'n') || (keycode == 39)){	// display next	image
			if(activeImage != (imageArray.length - 1)){
				myLightbox.disableKeyboardNav();
				myLightbox.changeImage(activeImage + 1);
		        }
	        }

        },

        //
        //      preloadNeighborImages()
        //      Preload previous and next images.
        //
        preloadNeighborImages: function(){

		if((imageArray.length -	1) > activeImage){
			preloadNextImage = new Image();
			preloadNextImage.src = imageArray[activeImage +	1][0];
	        }
		if(activeImage > 0){
			preloadPrevImage = new Image();
			preloadPrevImage.src = imageArray[activeImage -	1][0];
	        }
        
        },

        //
        //      end()
        //
        end: function() {
		this.disableKeyboardNav();
		Element.hide('lightbox');
		new Effect.Fade('overlay', { duration: overlayDuration});
		showSelectBoxes();
		showFlash();
        }
}

// -----------------------------------------------------------------------------------

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.com
//
function getPageScroll(){

        var xScroll, yScroll;

        if (self.pageYOffset) {
		yScroll	= self.pageYOffset;
		xScroll	= self.pageXOffset;
        } else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll	= document.documentElement.scrollTop;
		xScroll	= document.documentElement.scrollLeft;
        } else if (document.body) {// all other Explorers
		yScroll	= document.body.scrollTop;
		xScroll	= document.body.scrollLeft;     
        }

        arrayPageScroll = new Array(xScroll,yScroll) 
        return arrayPageScroll;
}

// -----------------------------------------------------------------------------------

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.com
// Edit for Firefox by pHaez
//
function getPageSize(){
        
        var xScroll, yScroll;
        
        if (window.innerHeight && window.scrollMaxY) {  
		xScroll	= window.innerWidth + window.scrollMaxX;
		yScroll	= window.innerHeight + window.scrollMaxY;
        } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll	= document.body.scrollWidth;
		yScroll	= document.body.scrollHeight;
        } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll	= document.body.offsetWidth;
		yScroll	= document.body.offsetHeight;
        }
        
        var windowWidth, windowHeight;
        
//      console.log(self.innerWidth);
//      console.log(document.documentElement.clientWidth);

        if (self.innerHeight) { // all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
	        }
		windowHeight = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
        } else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
        }       
        
        // for small pages with total height less then height of the viewport
        if(yScroll < windowHeight){
		pageHeight = windowHeight;
        } else { 
		pageHeight = yScroll;
        }

//      console.log("xScroll " + xScroll)
//      console.log("windowWidth " + windowWidth)

        // for small pages with total width less then width of the viewport
        if(xScroll < windowWidth){      
		pageWidth = xScroll;	        
        } else {
		pageWidth = windowWidth;
        }
//      console.log("pageWidth " + pageWidth)

        arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
        return arrayPageSize;
}

// -----------------------------------------------------------------------------------

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//
function getKey(e){
        if (e == null) { // ie
		keycode	= event.keyCode;
        } else { // mozilla
		keycode	= e.which;
        }
        key = String.fromCharCode(keycode).toLowerCase();
        
        if(key == 'x'){
        }
}

// -----------------------------------------------------------------------------------

//
// listenKey()
//
function listenKey () { document.onkeypress = getKey; }
        
// ---------------------------------------------------

function showSelectBoxes(){
        var selects = document.getElementsByTagName("select");
        for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
        }
}

// ---------------------------------------------------

function hideSelectBoxes(){
        var selects = document.getElementsByTagName("select");
        for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "hidden";
        }
}

// ---------------------------------------------------

function showFlash(){
        var flashObjects = document.getElementsByTagName("object");
        for (i = 0; i < flashObjects.length; i++) {
		flashObjects[i].style.visibility = "visible";
        }

        var flashEmbeds = document.getElementsByTagName("embed");
        for (i = 0; i < flashEmbeds.length; i++) {
		flashEmbeds[i].style.visibility	= "visible";
        }
}

// ---------------------------------------------------

function hideFlash(){
        var flashObjects = document.getElementsByTagName("object");
        for (i = 0; i < flashObjects.length; i++) {
		flashObjects[i].style.visibility = "hidden";
        }

        var flashEmbeds = document.getElementsByTagName("embed");
        for (i = 0; i < flashEmbeds.length; i++) {
		flashEmbeds[i].style.visibility	= "hidden";
        }

}


// ---------------------------------------------------

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Help from Ran Bar-On [ran2103@gmail.com]
//

function pause(ms){
        var date = new Date();
        curDate = null;
        do{var curDate = new Date();}
        while( curDate - date < ms);
}
/*
function pause(numberMillis) {
        var curently = new Date().getTime() + sender;
        while (new Date().getTime();    
}
*/
// ---------------------------------------------------



function initLightbox() { myLightbox = new Lightbox(); }
Event.observe(window, 'load', initLightbox, false);