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

//

//  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 = "images/loading.gif";

var fileBottomNavCloseImage = "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', "Bild " + eval(activeImage + 1) + " von " + 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);