// -----------------------------------------------------------------------------------
//
//	Lightbox Slideshow v1.1
//	by Justin Barkhuff - http://www.justinbarkhuff.com/lab/lightbox_slideshow/
//  Updated: 2007-08-15
//
//	Largely based on Lightbox v2.02
//	by Lokesh Dhakar - http://huddletogether.com/projects/lightbox2/
//	3/31/06
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//
//	The 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 id="hoverNav">
//					<a href="javascript:void(0);" id="prevLinkImg">&laquo; prev</a>
//					<a href="javascript:void(0);" id="nextLinkImg">next &raquo;</a>
//				</div>
//				<div id="loading">
//					<a href="javascript:void(0);" id="loadingLink">loading</a>
//				</div>
//			</div>
//		</div>
//		<div id="imageDataContainer">
//			<div id="imageData">
//				<div id="imageDetails">
//					<span id="caption"></span>
//					<span id="numberDisplay"></span>
//					<span id="detailsNav">
//						<a id="prevLinkDetails" href="javascript:void(0);">&laquo; prev</a>
//						<a id="nextLinkDetails" href="javascript:void(0);">next &raquo;</a>
//						<a id="slideShowControl" href="javascript:void(0);">stop slideshow</a>
//					</span>
//				</div>
//				<div id="close">
//					<a id="closeLink" href="javascript:void(0);">close</a>
//				</div>
//			</div>
//		</div>
//	</div>
//
// -----------------------------------------------------------------------------------

//
//	Lightbox Object
//

var Lightbox = {
    activeImage: null,
    badObjects: ['select', 'object', 'embed'],
    container: null,
    enableSlideshow: null,
    enableInterval: null, // trueWordWeb 19.08.2010
    groupName: null,
    imageArray: [],
    options: null,
    overlayDuration: null,
    overlayOpacity: null,
    playSlides: null,
    refTags: ['a', 'area'],
    relAttribute: null,
    resizeDuration: null,
    slideShowTimer: null,
    startImage: null,

    //
    // initialize()
    // Constructor sets class properties and configuration options and
    // inserts html at the bottom of the page which is used to display the shadow 
    // overlay and the image container.
    //
    initialize: function(options) {
        if (!document.getElementsByTagName) { return; }

        this.options = $H({
            animate: true, // resizing animations
            autoPlay: true, // should slideshow start automatically
            borderSize: 10, // if you adjust the padding in the CSS, you will need to update this variable
            containerID: document, // lightbox container object
            enableSlideshow: true, // enable slideshow feature
            enableInterval: false, // trueWordWeb 19.08.2010 enable interval feature
            googleAnalytics: false, // track individual image views using Google Analytics
            imageDataLocation: 'south', // location of image caption information
            initImage: '', // ID of image link to automatically launch when upon script initialization
            loop: true, // whether to continuously loop slideshow images
            overlayDuration: .2, // time to fade in shadow overlay
            overlayOpacity: .8, // transparency of shadow overlay
            prefix: '', // ID prefix for all dynamically created html elements
            relAttribute: 'lightbox', // specifies the rel attribute value that triggers lightbox
            resizeSpeed: 7, // controls the speed of the image resizing (1=slowest and 10=fastest)
            showGroupName: false, // show group name of images in image details
            slideTime: 5, // time to display images during slideshow
            strings: { // allows for localization
                closeLink: 'schliessen',
                loadingMsg: 'wird geladen...',
                nextLink: 'vor &raquo;',
                prevLink: '&laquo; zur&uuml;ck',
                slideTimeText: 'Interval', // trueWordWeb 18.08.2010
                slideTimePlus: '&#043;', // trueWordWeb 18.08.2010
                slideTimeMinus: '&#045;', // trueWordWeb 18.08.2010
                startSlideshow: 'Slideshow starten',
                stopSlideshow: 'Slideshow stoppen',
                numDisplayPrefix: 'Bild',
                numDisplaySeparator: 'von'
            }
        }).merge(options);

        if (this.options.animate) {
            this.overlayDuration = Math.max(this.options.overlayDuration, 0);
            this.options.resizeSpeed = Math.max(Math.min(this.options.resizeSpeed, 10), 1);
            this.resizeDuration = (11 - this.options.resizeSpeed) * 0.15;
        } else {
            this.overlayDuration = 0;
            this.resizeDuration = 0;
        }

        // truewordweb, 08.08.2010
        var objElements = document.getElementsByTagName("script");
        for (var i = 0; i < objElements.length; i++) {
            var objSource = objElements[i].src;

            //            alert(objSource.substr(objSource.lastIndexOf("?time=") + 6, 1));

            if (objSource.search(/lightbox\.js.*\?overlayopacity=/) != -1)
            { this.options.overlayOpacity = objSource.substr(objSource.lastIndexOf(".") - 1, 3); }
            if (objSource.search(/lightbox\.js.*\?slideshow=0/) != -1)
            { this.options.enableSlideshow = false; }
            if (objSource.search(/lightbox\.js.*\?showinterval=1/) != -1)
            { this.options.enableInterval = true; }
            if (objSource.search(/lightbox\.js.*\?interval=/) != -1)
            { this.options.slideTime = objSource.substr(objSource.lastIndexOf("?interval=") + 10, 1); }
            if (objSource.search(/lightbox\.js.*\?autostart=/) != -1) {
                if (objSource.substr(objSource.lastIndexOf("?autostart=") + 11, 1) == "1")
                { this.options.initImage = 'autostart'; }
            }
            if (objSource.search(/lightbox\.js.*\?autoslide=00/) != -1)
            { this.options.autoPlay = false; }
            //if (objSource.search(/\.\.\/css\/lightbox\.js/) != -1) {
            //    LightboxOptions.fileLoadingImage = '../images/loading.gif',
            //     LightboxOptions.fileBottomNavCloseImage = '../images/closelabel.gif';
            //}
        }

        this.enableSlideshow = this.options.enableSlideshow;
        this.enableInterval = this.options.enableInterval; // trueWordWeb 19.08.2010
        this.overlayOpacity = Math.max(Math.min(this.options.overlayOpacity, 1), 0);
        this.playSlides = this.options.autoPlay;
        this.container = $(this.options.containerID);
        this.relAttribute = this.options.relAttribute;
        this.updateImageList();

        var objBody = this.container != document ? this.container : document.getElementsByTagName('body').item(0);

        var objOverlay = document.createElement('div');
        objOverlay.setAttribute('id', this.getID('overlay'));
        objOverlay.style.display = 'none';
        objBody.appendChild(objOverlay);
        Event.observe(objOverlay, 'click', this.end.bindAsEventListener(this));

        var objLightbox = document.createElement('div');
        objLightbox.setAttribute('id', this.getID('lightbox'));
        objLightbox.style.display = 'none';
        objBody.appendChild(objLightbox);

        var objImageDataContainer = document.createElement('div');
        objImageDataContainer.setAttribute('id', this.getID('imageDataContainer'));
        objImageDataContainer.className = this.getID('clearfix');

        var objImageData = document.createElement('div');
        objImageData.setAttribute('id', this.getID('imageData'));
        objImageDataContainer.appendChild(objImageData);

        var objImageDetails = document.createElement('div');
        objImageDetails.setAttribute('id', this.getID('imageDetails'));
        objImageData.appendChild(objImageDetails);

        var objCaption = document.createElement('span');
        objCaption.setAttribute('id', this.getID('caption'));
        objImageDetails.appendChild(objCaption);

        var objNumberDisplay = document.createElement('span');
        objNumberDisplay.setAttribute('id', this.getID('numberDisplay'));
        objImageDetails.appendChild(objNumberDisplay);

        var objDetailsNav = document.createElement('span');
        objDetailsNav.setAttribute('id', this.getID('detailsNav'));
        objImageDetails.appendChild(objDetailsNav);

        var objPrevLink = document.createElement('a');
        objPrevLink.setAttribute('id', this.getID('prevLinkDetails'));
        objPrevLink.setAttribute('href', 'javascript:void(0);');
        objPrevLink.innerHTML = this.options.strings.prevLink;
        objDetailsNav.appendChild(objPrevLink);
        Event.observe(objPrevLink, 'click', this.showPrev.bindAsEventListener(this));

        var objNextLink = document.createElement('a');
        objNextLink.setAttribute('id', this.getID('nextLinkDetails'));
        objNextLink.setAttribute('href', 'javascript:void(0);');
        objNextLink.innerHTML = this.options.strings.nextLink;
        objDetailsNav.appendChild(objNextLink);
        Event.observe(objNextLink, 'click', this.showNext.bindAsEventListener(this));

        // trueWordWeb 18.08.2010
        var objSlideTimeDisplay = document.createElement('span');
        objSlideTimeDisplay.setAttribute('id', this.getID('slideTimeDisplay'));
        objSlideTimeDisplay.innerHTML = this.options.strings.slideTimeText + ': ' + this.options.slideTime;
        objDetailsNav.appendChild(objSlideTimeDisplay);

        var objSlideTimePlus = document.createElement('a');
        objSlideTimePlus.setAttribute('id', this.getID('slideTimePlus'));
        objSlideTimePlus.setAttribute('href', 'javascript:void(0);');
        objSlideTimePlus.innerHTML = this.options.strings.slideTimePlus;
        objDetailsNav.appendChild(objSlideTimePlus);
        Event.observe(objSlideTimePlus, 'click', this.slideTimePlus.bindAsEventListener(this));

        var objSlideTimeMinus = document.createElement('a');
        objSlideTimeMinus.setAttribute('id', this.getID('slideTimeMinus'));
        objSlideTimeMinus.setAttribute('href', 'javascript:void(0);');
        objSlideTimeMinus.innerHTML = this.options.strings.slideTimeMinus;
        objDetailsNav.appendChild(objSlideTimeMinus);
        Event.observe(objSlideTimeMinus, 'click', this.slideTimeMinus.bindAsEventListener(this));
        //

        var objSlideShowControl = document.createElement('a');
        objSlideShowControl.setAttribute('id', this.getID('slideShowControl'));
        objSlideShowControl.setAttribute('href', 'javascript:void(0);');
        objDetailsNav.appendChild(objSlideShowControl);
        Event.observe(objSlideShowControl, 'click', this.toggleSlideShow.bindAsEventListener(this));

        var objClose = document.createElement('div');
        objClose.setAttribute('id', this.getID('close'));
        objImageData.appendChild(objClose);

        var objCloseLink = document.createElement('a');
        objCloseLink.setAttribute('id', this.getID('closeLink'));
        objCloseLink.setAttribute('href', 'javascript:void(0);');
        objCloseLink.innerHTML = this.options.strings.closeLink;
        objClose.appendChild(objCloseLink);
        Event.observe(objCloseLink, 'click', this.end.bindAsEventListener(this));

        if (this.options.imageDataLocation == 'north') {
            objLightbox.appendChild(objImageDataContainer);
        }

        var objOuterImageContainer = document.createElement('div');
        objOuterImageContainer.setAttribute('id', this.getID('outerImageContainer'));
        objLightbox.appendChild(objOuterImageContainer);

        var objImageContainer = document.createElement('div');
        objImageContainer.setAttribute('id', this.getID('imageContainer'));
        objOuterImageContainer.appendChild(objImageContainer);

        var objLightboxImage = document.createElement('img');
        objLightboxImage.setAttribute('id', this.getID('lightboxImage'));
        objImageContainer.appendChild(objLightboxImage);

        var objHoverNav = document.createElement('div');
        objHoverNav.setAttribute('id', this.getID('hoverNav'));
        objImageContainer.appendChild(objHoverNav);

        var objPrevLinkImg = document.createElement('a');
        objPrevLinkImg.setAttribute('id', this.getID('prevLinkImg'));
        objPrevLinkImg.setAttribute('href', 'javascript:void(0);');
        objHoverNav.appendChild(objPrevLinkImg);
        Event.observe(objPrevLinkImg, 'click', this.showPrev.bindAsEventListener(this));

        var objNextLinkImg = document.createElement('a');
        objNextLinkImg.setAttribute('id', this.getID('nextLinkImg'));
        objNextLinkImg.setAttribute('href', 'javascript:void(0);');
        objHoverNav.appendChild(objNextLinkImg);
        Event.observe(objNextLinkImg, 'click', this.showNext.bindAsEventListener(this));

        var objLoading = document.createElement('div');
        objLoading.setAttribute('id', this.getID('loading'));
        objImageContainer.appendChild(objLoading);

        var objLoadingLink = document.createElement('a');
        objLoadingLink.setAttribute('id', this.getID('loadingLink'));
        objLoadingLink.setAttribute('href', 'javascript:void(0);');
        objLoadingLink.innerHTML = this.options.strings.loadingMsg;
        objLoading.appendChild(objLoadingLink);
        Event.observe(objLoadingLink, 'click', this.end.bindAsEventListener(this));

        if (this.options.imageDataLocation != 'north') {
            objLightbox.appendChild(objImageDataContainer);
        }

        if (this.options.initImage != '') {
            this.start($(this.options.initImage));
        }
    },

    //
    //	updateImageList()
    //	Loops through specific tags within 'container' looking for 
    // 'lightbox' references and applies onclick events to them.
    //
    updateImageList: function() {
        var el, els, rel;
        for (var i = 0; i < this.refTags.length; i++) {
            els = this.container.getElementsByTagName(this.refTags[i]);
            for (var j = 0; j < els.length; j++) {
                el = els[j];
                rel = String(el.getAttribute('rel'));
                if (el.getAttribute('href') && (rel.toLowerCase().match(this.relAttribute))) {
                    el.onclick = function() { Lightbox.start(this); return false; }
                }
            }
        }
    },

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

        this.hideBadObjects();

        // stretch overlay to fill page and fade in
        var pageSize = this.getPageSize();
        $(this.getID('overlay')).setStyle({ height: pageSize.pageHeight + 'px' });
        new Effect.Appear(this.getID('overlay'), { duration: this.overlayDuration, from: 0, to: this.overlayOpacity });

        this.imageArray = [];
        this.groupName = null;

        var rel = imageLink.getAttribute('rel');
        var imageTitle = '';

        // trueWordWeb 10.11.2010 title aus onmouseover auslesen, gebraucht für showtexthere
        // Prüfen ob data= überhaupt vorkommt und nur dann anwenden
        var searchDataForTitle = document.body.innerHTML.indexOf('.data=') > -1;
        var ausdruck = /data=.*;/;

        // if image is NOT part of a group..
        if (rel == this.relAttribute) {
            // add single image to imageArray
            imageTitle = imageLink.getAttribute('title') ? imageLink.getAttribute('title') : '';

            // trueWordWeb 11.11.2010 title aus onmouseover auslesen, gebraucht für showtexthere
            if (searchDataForTitle == true)
            {
                try
                {
                    if (imageTitle == '')
                    {
                        var mouseover = imageLink.getElementsByTagName('img')[0].getAttribute('onMouseOver');
                        var erg = ausdruck.exec(mouseover);
                        if (erg[0].length > 8)
                        { imageTitle = erg[0].substring(7, erg[0].length - 9); }
                    }
                }
                catch (err) { }
            }

            // trueWordWeb 08.08.2010, replace
            imageTitle = imageTitle.replace("\r\n", "<br>").replace("\r", "<br>");
            this.imageArray.push({ 'link': imageLink.getAttribute('href'), 'title': imageTitle });
            this.startImage = 0;
        }
        else
        {
            // if image is part of a group..
            var els = this.container.getElementsByTagName(imageLink.tagName);
            var links = '';
            var len = 0;
            // loop through anchors, find other images in group, and add them to imageArray
            for (var i = 0; i < els.length; i++) {
                var el = els[i];
                if (el.getAttribute('href') && (el.getAttribute('rel') == rel)) {
                    // trueWoreWeb 09.11.2010 only if not always in array                    
                    if (links.indexOf(el.getAttribute('href')) == -1) {
                        links = links + el.getAttribute('href');

                        imageTitle = el.getAttribute('title') ? el.getAttribute('title') : '';

                        // trueWordWeb 10.11.2010 title aus onmouseover auslesen, gebraucht für showtexthere
                        if (searchDataForTitle == true)
                        {
                            try {
                                if (imageTitle == '')
                                {
                                    var mouseover = el.getElementsByTagName('img')[0].getAttribute('onMouseOver');
                                    var erg = ausdruck.exec(mouseover);
                                    if (erg[0].length > 8)
                                    { imageTitle = erg[0].substring(6, erg[0].length - 2); }
                                }
                            }
                            catch (err) { }
                        }

                        // trueWordWeb 08.08.2010, replace
                        imageTitle = imageTitle.replace("\r\n", "<br>").replace("\r", "<br>");

                        this.imageArray.push({ 'link': el.getAttribute('href'), 'title': imageTitle });

                        if (el.getAttribute('href') == imageLink.getAttribute('href')) {
                            this.startImage = this.imageArray.length - 1;
                        }
                    }
                }
            }
            // get group name
            this.groupName = rel.substring(this.relAttribute.length + 1, rel.length - 1);
        }

        // calculate top offset for the lightbox and display 
        var pageScroll = this.getPageScroll();
        var lightboxTop = pageScroll.y + (pageSize.winHeight / 15);

        $(this.getID('lightbox')).setStyle({ top: lightboxTop + 'px' }).show();
        this.changeImage(this.startImage);
    },

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

        this.disableKeyboardNav();
        this.pauseSlideShow();

        // hide elements during transition
        $(this.getID('loading')).show();
        $(this.getID('lightboxImage')).hide();
        $(this.getID('hoverNav')).hide();
        $(this.getID('imageDataContainer')).hide();
        $(this.getID('numberDisplay')).hide();
        $(this.getID('detailsNav')).hide();

        var imgPreloader = new Image();

        // once image is preloaded, resize image container
        imgPreloader.onload = function() {
            $(Lightbox.getID('lightboxImage')).src = imgPreloader.src;
            Lightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
        }
        imgPreloader.src = this.imageArray[this.activeImage].link;

        if (this.options.googleAnalytics) {
            urchinTracker(this.imageArray[this.activeImage].link);
        }
    },

    //
    //	resizeImageContainer()
    //
    resizeImageContainer: function(imgWidth, imgHeight) {
        // get current height and width
        var cDims = $(this.getID('outerImageContainer')).getDimensions();

        // scalars based on change from old to new
        var xScale = ((imgWidth + (this.options.borderSize * 2)) / cDims.width) * 100;
        var yScale = ((imgHeight + (this.options.borderSize * 2)) / cDims.height) * 100;

        // calculate size difference between new and old image, and resize if necessary
        var wDiff = (cDims.width - this.options.borderSize * 2) - imgWidth;
        var hDiff = (cDims.height - this.options.borderSize * 2) - imgHeight;

        if (!(hDiff == 0)) { new Effect.Scale(this.getID('outerImageContainer'), yScale, { scaleX: false, duration: this.resizeDuration, queue: 'front' }); }
        if (!(wDiff == 0)) { new Effect.Scale(this.getID('outerImageContainer'), xScale, { scaleY: false, delay: this.resizeDuration, duration: this.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) { this.pause(250); } else { this.pause(100); }
        }

        $(this.getID('prevLinkImg')).setStyle({ height: imgHeight + 'px' });
        $(this.getID('nextLinkImg')).setStyle({ height: imgHeight + 'px' });
        $(this.getID('imageDataContainer')).setStyle({ width: (imgWidth + (this.options.borderSize * 2)) + 'px' });

        this.showImage();
    },

    //
    //	showImage()
    //	Display image and begin preloading neighbors.
    //
    showImage: function() {
        $(this.getID('loading')).hide();
        new Effect.Appear(this.getID('lightboxImage'), { duration: 0.5, queue: 'end', afterFinish: function() { Lightbox.updateDetails(); } });
        this.preloadNeighborImages();
    },

    //
    //	updateDetails()
    //	Display caption, image number, and bottom nav.
    //
    updateDetails: function() {
        $(this.getID('caption')).show();
        $(this.getID('caption')).update(this.imageArray[this.activeImage].title);

        // if image is part of set display 'Image x of y' 
        if (this.imageArray.length > 1) {
            var num_display = this.options.strings.numDisplayPrefix + ' ' + eval(this.activeImage + 1) + ' ' + this.options.strings.numDisplaySeparator + ' ' + this.imageArray.length;
            if (this.options.showGroupName && this.groupName != '') {
                num_display += ' ' + this.options.strings.numDisplaySeparator + ' ' + this.groupName;
            }
            $(this.getID('numberDisplay')).update(num_display).show();
            if (!this.enableSlideshow) {
                $(this.getID('slideShowControl')).hide();
            }
            // trueWordWeb 19.08.2010
            if (!this.enableInterval) {
                $(this.getID('slideTimeDisplay')).hide();
                $(this.getID('slideTimePlus')).hide();
                $(this.getID('slideTimeMinus')).hide();
            }
            //
            $(this.getID('detailsNav')).show();
        }

        new Effect.Parallel(
			[new Effect.SlideDown(this.getID('imageDataContainer'), { sync: true }),
			  new Effect.Appear(this.getID('imageDataContainer'), { sync: true })],
			{ duration: .65, afterFinish: function() { Lightbox.updateNav(); } }
		);
    },

    //
    //	updateNav()
    //	Display appropriate previous and next hover navigation.
    //
    updateNav: function() {
        if (this.imageArray.length > 1) {
            $(this.getID('hoverNav')).show();
            if (this.enableSlideshow) {
                if (this.playSlides) {
                    this.startSlideShow();
                } else {
                    this.stopSlideShow();
                }
            }
        }
        this.enableKeyboardNav();
    },
    //
    //	startSlideShow()
    //	Starts the slide show
    //
    startSlideShow: function() {
        this.playSlides = true;
        this.slideShowTimer = new PeriodicalExecuter(function(pe) { Lightbox.showNext(); pe.stop(); }, this.options.slideTime);
        $(this.getID('slideShowControl')).update(this.options.strings.stopSlideshow);
    },

    //
    //	stopSlideShow()
    //	Stops the slide show
    //
    stopSlideShow: function() {
        this.playSlides = false;
        if (this.slideShowTimer) {
            this.slideShowTimer.stop();
        }
        $(this.getID('slideShowControl')).update(this.options.strings.startSlideshow);
    },

    //
    //	stopSlideShow()
    //	Stops the slide show
    //
    toggleSlideShow: function() {
        if (this.playSlides) {
            this.stopSlideShow();
        } else {
            this.startSlideShow();
        }
    },

    //
    //	pauseSlideShow()
    //	Pauses the slide show (doesn't change the value of this.playSlides)
    //
    pauseSlideShow: function() {
        if (this.slideShowTimer) {
            this.slideShowTimer.stop();
        }
    },

    //
    //	showNext()
    //	Display the next image in a group
    //
    showNext: function() {
        if (this.imageArray.length > 1) {
            if (!this.options.loop && ((this.activeImage == this.imageArray.length - 1 && this.startImage == 0) || (this.activeImage + 1 == this.startImage))) {
                return this.end();
            }
            if (this.activeImage == this.imageArray.length - 1) {
                this.changeImage(0);
            } else {
                this.changeImage(this.activeImage + 1);
            }
        }
    },

    //
    //	showPrev()
    //	Display the next image in a group
    //
    showPrev: function() {
        if (this.imageArray.length > 1) {
            if (this.activeImage == 0) {
                this.changeImage(this.imageArray.length - 1);
            } else {
                this.changeImage(this.activeImage - 1);
            }
        }
    },

    //
    //	showFirst()
    //	Display the first image in a group
    //
    showFirst: function() {
        if (this.imageArray.length > 1) {
            this.changeImage(0);
        }
    },

    //
    //	showFirst()
    //	Display the first image in a group
    //
    showLast: function() {
        if (this.imageArray.length > 1) {
            this.changeImage(this.imageArray.length - 1);
        }
    },

    // trueWordWeb 18.08.2010
    //
    //	slideTimePlus()
    //	slidetime erhöhen
    //
    slideTimePlus: function() {
        this.options.slideTime = parseInt(this.options.slideTime) + 1;
        var display = this.options.strings.slideTimeText + ': ' + this.options.slideTime;
        $(this.getID('slideTimeDisplay')).update(display).show();
    },
    //	slideTimeMinus()
    //	slidetime erniedrigen
    //
    slideTimeMinus: function() {
        this.options.slideTime = parseInt(this.options.slideTime) - 1;
        var display = this.options.strings.slideTimeText + ': ' + this.options.slideTime;
        $(this.getID('slideTimeDisplay')).update(display).show();
    },
    //

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

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

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

        key = String.fromCharCode(keycode).toLowerCase();

        if (key == 'x' || key == 'o' || key == 'c') { // close lightbox
            Lightbox.end();
        } else if (key == 'p' || key == '%') { // display previous image
            Lightbox.showPrev();
        } else if (key == 'n' || key == '\'') { // display next image
            Lightbox.showNext();
        } else if (key == 'f') { // display first image
            Lightbox.showFirst();
        } else if (key == 'l') { // display last image
            Lightbox.showLast();
        } else if (key == 's') { // toggle slideshow
            if (Lightbox.imageArray.length > 0 && Lightbox.options.enableSlideshow) {
                Lightbox.toggleSlideShow();
            }
        }
    },

    //
    //	preloadNeighborImages()
    //	Preload previous and next images.
    //
    preloadNeighborImages: function() {
        var nextImageID = this.imageArray.length - 1 == this.activeImage ? 0 : this.activeImage + 1;
        nextImage = new Image();
        nextImage.src = this.imageArray[nextImageID].link

        var prevImageID = this.activeImage == 0 ? this.imageArray.length - 1 : this.activeImage - 1;
        prevImage = new Image();
        prevImage.src = this.imageArray[prevImageID].link;
    },

    //
    //	end()
    //
    end: function() {
        this.disableKeyboardNav();
        this.pauseSlideShow();
        $(this.getID('lightbox')).hide();
        new Effect.Fade(this.getID('overlay'), { duration: this.overlayDuration });
        this.showBadObjects();
    },

    //
    //	showBadObjects()
    //
    showBadObjects: function() {
        var els;
        var tags = Lightbox.badObjects;
        for (var i = 0; i < tags.length; i++) {
            els = document.getElementsByTagName(tags[i]);
            for (var j = 0; j < els.length; j++) {
                $(els[j]).setStyle({ visibility: 'visible' });
            }
        }
    },

    //
    //	hideBadObjects()
    //
    hideBadObjects: function() {
        var els;
        var tags = Lightbox.badObjects;
        for (var i = 0; i < tags.length; i++) {
            els = document.getElementsByTagName(tags[i]);
            for (var j = 0; j < els.length; j++) {
                $(els[j]).setStyle({ visibility: 'hidden' });
            }
        }
    },

    //
    // 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
    //
    pause: function(numberMillis) {
        var now = new Date();
        var exitTime = now.getTime() + numberMillis;
        while (true) {
            now = new Date();
            if (now.getTime() > exitTime)
                return;
        }
    },

    //
    // getPageScroll()
    // Returns array with x,y page scroll values.
    // Core code from - quirksmode.org
    //
    getPageScroll: function() {
        var x, y;
        if (self.pageYOffset) {
            x = self.pageXOffset;
            y = self.pageYOffset;
        } else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
            x = document.documentElement.scrollLeft;
            y = document.documentElement.scrollTop;
        } else if (document.body) {// all other Explorers
            x = document.body.scrollLeft;
            y = document.body.scrollTop;
        }
        return { x: x, y: y };
    },

    //
    // getPageSize()
    // Returns array with page width, height and window width, height
    // Core code from - quirksmode.org
    // Edit for Firefox by pHaez
    //
    getPageSize: function() {
        var scrollX, scrollY, windowX, windowY, pageX, pageY;
        if (window.innerHeight && window.scrollMaxY) {
            scrollX = document.body.scrollWidth;
            scrollY = window.innerHeight + window.scrollMaxY;
        } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac
            scrollX = document.body.scrollWidth;
            scrollY = document.body.scrollHeight;
        } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
            scrollX = document.body.offsetWidth;
            scrollY = document.body.offsetHeight;
        }

        if (self.innerHeight) {	// all except Explorer
            windowX = self.innerWidth;
            windowY = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
            windowX = document.documentElement.clientWidth;
            windowY = document.documentElement.clientHeight;
        } else if (document.body) { // other Explorers
            windowX = document.body.clientWidth;
            windowY = document.body.clientHeight;
        }

        pageY = (scrollY < windowY) ? windowY : scrollY; // for small pages with total height less then height of the viewport
        pageX = (scrollX < windowX) ? windowX : scrollX; // for small pages with total width less then width of the viewport

        return { pageWidth: pageX, pageHeight: pageY, winWidth: windowX, winHeight: windowY };
    },

    //
    // getID()
    // Returns formatted Lightbox element ID
    //
    getID: function(id) {
        return this.options.prefix + id;
    }
}

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

Event.observe(window,'load',function(){ Lightbox.initialize(); });