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/*

        Lightbox JS: Fullsize Image Overlays 

        by Lokesh Dhakar - http://www.huddletogether.com

        For more information on this script, visit:

        http://huddletogether.com/projects/lightbox/

        Script featured on Dynamic Drive code library Jan 24th, 06':

        http://www.dynamicdrive.com

        Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/

        (basically, do anything you want, just leave my name and link)

        Table of Contents

        -----------------

        Configuration

        Functions

        - getPageScroll()

        - getPageSize()

        - pause()

        - getKey()

        - listenKey()

        - showLightbox()

        - hideLightbox()

        - initLightbox()

        - addLoadEvent()

        Function Calls

        - addLoadEvent(initLightbox)

*/

//

// Configuration

//

// If you would like to use a custom loading image or close button reference them in the next two lines.

var loadingImage = 'images/loading.gif';                

var closeButton = 'images/close.gif';                

//

// 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;

}

//

// pause(numberMillis)

// Pauses code execution for specified time. Uses busy code, not good.

// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602

//

function pause(numberMillis) {

        var now = new Date();

        var exitTime = now.getTime() + numberMillis;

        while (true) {

                now = new Date();

                if (now.getTime() > exitTime)

                        return;

        }

}

//

// 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'){ hideLightbox(); }

}

//

// listenKey()

//

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

//

// showLightbox()

// Preloads images. Pleaces new image in lightbox then centers and displays.

//

function showLightbox(objLink)

{

        // prep objects

        var objOverlay = document.getElementById('overlay');

        var objLightbox = document.getElementById('lightbox');

        var objCaption = document.getElementById('lightboxCaption');

        var objImage = document.getElementById('lightboxImage');

        var objLoadingImage = document.getElementById('loadingImage');

        var objLightboxDetails = document.getElementById('lightboxDetails');

        var arrayPageSize = getPageSize();

        var arrayPageScroll = getPageScroll();

        // center loadingImage if it exists

        if (objLoadingImage) {

                objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');

                objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');

                objLoadingImage.style.display = 'block';

        }

        // set height of Overlay to take up whole page and show

        objOverlay.style.height = (arrayPageSize[1] + 'px');

        objOverlay.style.display = 'block';

        // preload image

        imgPreload = new Image();

        imgPreload.onload=function(){

                objImage.src = objLink.href;

                // center lightbox and make sure that the top and left values are not negative

                // and the image placed outside the viewport

                var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);

                var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);

                objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";

                objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";

                objLightboxDetails.style.width = imgPreload.width + 'px';

                if(objLink.getAttribute('title')){

                        objCaption.style.display = 'block';

                        //objCaption.style.width = imgPreload.width + 'px';

                        objCaption.innerHTML = objLink.getAttribute('title');

                } else {

                        objCaption.style.display = 'none';

                }

                // A small pause between the image loading and displaying is required with IE,

                // this prevents the previous image displaying for a short burst causing flicker.

                if (navigator.appVersion.indexOf("MSIE")!=-1){

                        pause(250);

                } 

                if (objLoadingImage) {        objLoadingImage.style.display = 'none'; }

                objLightbox.style.display = 'block';

                // After image is loaded, update the overlay height as the new image might have

                // increased the overall page height.

                arrayPageSize = getPageSize();

                objOverlay.style.height = (arrayPageSize[1] + 'px');

                // Check for 'x' keypress

                listenKey();

                return false;

        }

        imgPreload.src = objLink.href;

}

//

// hideLightbox()

//

function hideLightbox()

{

        // get objects

        objOverlay = document.getElementById('overlay');

        objLightbox = document.getElementById('lightbox');

        // hide lightbox and overlay

        objOverlay.style.display = 'none';

        objLightbox.style.display = 'none';

        // disable keypress listener

        document.onkeypress = '';

}

//

// initLightbox()

// Function runs on window load, going through link tags looking for rel="lightbox".

// These links receive onclick events that enable the lightbox display for their targets.

// The function also inserts html markup at the top of the page which will be used as a

// container for the overlay pattern and the inline image.

//

function initLightbox()

{

        if (!document.getElementsByTagName){ return; }

        var anchors = document.getElementsByTagName("a");

        // loop through all anchor tags

        for (var i=0; i<anchors.length; i++){

                var anchor = anchors[i];

                if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){

                        anchor.onclick = function () {showLightbox(this); return false;}

                }

        }

        // the rest of this code inserts html at the top of the page that looks like this:

        //

        // <div id="overlay">

        //                <a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>

        //        </div>

        // <div id="lightbox">

        //                <a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">

        //                        <img id="closeButton" />                

        //                        <img id="lightboxImage" />

        //                </a>

        //                <div id="lightboxDetails">

        //                        <div id="lightboxCaption"></div>

        //                        <div id="keyboardMsg"></div>

        //                </div>

        // </div>

        var objBody = document.getElementsByTagName("body").item(0);

        // create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)

        var objOverlay = document.createElement("div");

        objOverlay.setAttribute('id','overlay');

        objOverlay.onclick = function () {hideLightbox(); return false;}

        objOverlay.style.display = 'none';

        objOverlay.style.position = 'absolute';

        objOverlay.style.top = '0';

        objOverlay.style.left = '0';

        objOverlay.style.zIndex = '90';

         objOverlay.style.width = '100%';

        objBody.insertBefore(objOverlay, objBody.firstChild);

        var arrayPageSize = getPageSize();

        var arrayPageScroll = getPageScroll();

        // preload and create loader image

        var imgPreloader = new Image();

        // if loader image found, create link to hide lightbox and create loadingimage

        imgPreloader.onload=function(){

                var objLoadingImageLink = document.createElement("a");

                objLoadingImageLink.setAttribute('href','#');

                objLoadingImageLink.onclick = function () {hideLightbox(); return false;}

                objOverlay.appendChild(objLoadingImageLink);

                var objLoadingImage = document.createElement("img");

                objLoadingImage.src = loadingImage;

                objLoadingImage.setAttribute('id','loadingImage');

                objLoadingImage.style.position = 'absolute';

                objLoadingImage.style.zIndex = '150';

                objLoadingImageLink.appendChild(objLoadingImage);

                imgPreloader.onload=function(){};        //        clear onLoad, as IE will flip out w/animated gifs

                return false;

        }

        imgPreloader.src = loadingImage;

        // create lightbox div, same note about styles as above

        var objLightbox = document.createElement("div");

        objLightbox.setAttribute('id','lightbox');

        objLightbox.style.display = 'none';

        objLightbox.style.position = 'absolute';

        objLightbox.style.zIndex = '100';        

        objBody.insertBefore(objLightbox, objOverlay.nextSibling);

        // create link

        var objLink = document.createElement("a");

        objLink.setAttribute('href','#');

        objLink.setAttribute('title','Click to close');

        objLink.onclick = function () {hideLightbox(); return false;}

        objLightbox.appendChild(objLink);

        // preload and create close button image

        var imgPreloadCloseButton = new Image();

        // if close button image found, 

        imgPreloadCloseButton.onload=function(){

                var objCloseButton = document.createElement("img");

                objCloseButton.src = closeButton;

                objCloseButton.setAttribute('id','closeButton');

                objCloseButton.style.position = 'absolute';

                objCloseButton.style.zIndex = '200';

                objLink.appendChild(objCloseButton);

                return false;

        }

        imgPreloadCloseButton.src = closeButton;

        // create image

        var objImage = document.createElement("img");

        objImage.setAttribute('id','lightboxImage');

        objLink.appendChild(objImage);

        // create details div, a container for the caption and keyboard message

        var objLightboxDetails = document.createElement("div");

        objLightboxDetails.setAttribute('id','lightboxDetails');

        objLightbox.appendChild(objLightboxDetails);

        // create caption

        var objCaption = document.createElement("div");

        objCaption.setAttribute('id','lightboxCaption');

        objCaption.style.display = 'none';

        objLightboxDetails.appendChild(objCaption);

        // create keyboard message

        var objKeyboardMsg = document.createElement("div");

        objKeyboardMsg.setAttribute('id','keyboardMsg');

        objKeyboardMsg.innerHTML = 'press <kbd>x</kbd> to close';

        objLightboxDetails.appendChild(objKeyboardMsg);

}

//

// addLoadEvent()

// Adds event to window.onload without overwriting currently assigned onload functions.

// Function found at Simon Willison's weblog - http://simon.incutio.com/

//

function addLoadEvent(func)

{        

        var oldonload = window.onload;

        if (typeof window.onload != 'function'){

            window.onload = func;

        } else {

                window.onload = function(){

                oldonload();

                func();

                }

        }

}

addLoadEvent(initLightbox);        // run initLightbox onLoad