// -----------------------------------------------------------------------------------
//
//	Lightbox v2.03
//	by Lokesh Dhakar - http://www.huddletogether.com
//	4/9/06
//
//	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.org), Thomas Fuchs(mir.aculo.us), and others.
//
//	Lightbox v2.03a
//	by Dynamicdrive.com- http://www.dynamicdrive.com
//	Nov 29th, 2007
//	Added ability for the caption ("title" attr of link) to be optionally hyperlinked, by throwing in a "rev" attr containing the desired link
// -----------------------------------------------------------------------------------
/*

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

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

Lightbox Class Declaration
- initialize()
- 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 = "/i/lightbox/loading.gif";
var fileBottomNavCloseImage = "/i/lightbox/closelabel.gif";

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";
 },
 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. Loops through anchor tags looking for 
 // 'lightbox' references and applies onclick events to appropriate links. The 2nd section of
 // the function inserts html at the bottom of the page which is used to display the shadow 
 // overlay and the image container.
 //
 initialize: 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; }
   }
  }

  // The rest of this 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');
  objImageDataContainer.className = 'clearfix';
  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);
 },

 //
 //	start()
 //	Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
 //
 start: function(imageLink) {

  function getImageTitle(anchor) { //DynamicDrive.com added function that allows the caption("title") to be linked ("rev").
   var ddimageTitle = anchor.getAttribute('title')
   var ddimageTitleURL = (ddimageTitle != null && ddimageTitle != "") ? anchor.getAttribute('rev') : null
   return ddimageTitleFinal = (ddimageTitleURL != null && ddimageTitleURL != "") ? '<a href="' + ddimageTitleURL + '" class="ddcaptionurl">' + ddimageTitle + '</a>' : ddimageTitle
  };

  hideSelectBoxes();
  hideFlash();

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

  new Effect.Appear('overlay', { duration: overlayDuration, from: 0.0, to: 0.8 });

  imageArray = [];
  imageNum = 0;

  if (!document.getElementsByTagName) { return; }
  var anchors = document.getElementsByTagName('a');

  // 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'), getImageTitle(imageLink)));
  } 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'), getImageTitle(anchor)));
    }
   }
   imageArray.removeDuplicates();
   while (imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++; }
  }

  // calculate top offset for the lightbox and display 
  var arrayPageScroll = getPageScroll();
  var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);

  Element.setTop('lightbox', lightboxTop);
  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.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() {

  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', "" + eval(activeImage + 1) + " / " + 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.org
//
function getPageScroll() {

 var yScroll;

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

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

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

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize() {

 var xScroll, yScroll;

 if (window.innerHeight && window.scrollMaxY) {
  xScroll = document.body.scrollWidth;
  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;
 if (self.innerHeight) {	// all except Explorer
  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;
 }

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

 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("embeds");
 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("embeds");
 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);