/***********************************************************************************************
	
Copyright (c) 2005 - Alf Magne Kalleland post@dhtmlgoodies.com
	
UPDATE LOG:
	
March, 10th, 2006 : Added support for a message while large image is loading
	
Get this and other scripts at www.dhtmlgoodies.com
	
You can use this script freely as long as this copyright message is kept intact.
	
***********************************************************************************************/

var displayWaitMessage = true; // Display a please wait message while images are loading?


var activeImage = false;
var imageGalleryLeftPos = false;
var imageGalleryWidth = false;
var imageGalleryObj = false;
var maxGalleryXPos = false;
var slideSpeed = 0;
var imageGalleryCaptions = new Array();
function startSlide(e) {
    if (document.all) e = event;
    var id = this.id;
    this.getElementsByTagName('IMG')[0].src = '/images/' + this.id + '_over.gif';
    if (this.id == 'arrow_right') {
        slideSpeedMultiply = Math.floor((e.clientX - this.offsetLeft) / 5);
        slideSpeed = -1 * slideSpeedMultiply;
        slideSpeed = Math.max(-10, slideSpeed);
    } else {
        slideSpeedMultiply = 10 - Math.floor((e.clientX - this.offsetLeft) / 5);
        slideSpeed = 1 * slideSpeedMultiply;
        slideSpeed = Math.min(10, slideSpeed);
        if (slideSpeed < 0) slideSpeed = 10;
    }
}

function releaseSlide() {
    var id = this.id;
    this.getElementsByTagName('IMG')[0].src = '/images/' + this.id + '.gif';
    slideSpeed = 0;
}

function gallerySlide() {
    if (slideSpeed != 0) {
        var leftPos = imageGalleryObj.offsetLeft;
        leftPos = leftPos / 1 + slideSpeed;
        if (leftPos > maxGalleryXPos) {
            leftPos = maxGalleryXPos;
            slideSpeed = 0;

        }
        if (leftPos < minGalleryXPos) {
            leftPos = minGalleryXPos;
            slideSpeed = 0;
        }

        imageGalleryObj.style.left = leftPos + 'px';
    }
    setTimeout('gallerySlide()', 20);

}

function showImage() {
    if (activeImage) {
        activeImage.style.filter = 'alpha(opacity=50)';
        activeImage.style.opacity = 0.5;
    }
    this.style.filter = 'alpha(opacity=100)';
    this.style.opacity = 1;
    activeImage = this;
}

function initSlideShow() {
    document.getElementById('arrow_left').onmousemove = startSlide;
    document.getElementById('arrow_left').onmouseout = releaseSlide;
    document.getElementById('arrow_right').onmousemove = startSlide;
    document.getElementById('arrow_right').onmouseout = releaseSlide;

    imageGalleryObj = document.getElementById('theImages');
    imageGalleryLeftPos = imageGalleryObj.offsetLeft;
    imageGalleryWidth = document.getElementById('galleryContainer').offsetWidth - 80;
    maxGalleryXPos = imageGalleryObj.offsetLeft;
    minGalleryXPos = imageGalleryWidth - document.getElementById('slideEnd').offsetLeft;
    var slideshowImages = imageGalleryObj.getElementsByTagName('IMG');
    for (var no = 0; no < slideshowImages.length; no++) {
        slideshowImages[no].onmouseover = showImage;
    }

    var divs = imageGalleryObj.getElementsByTagName('DIV');
    for (var no = 0; no < divs.length; no++) {
        if (divs[no].className == 'imageCaption') imageGalleryCaptions[imageGalleryCaptions.length] = divs[no].innerHTML;
    }
    gallerySlide();
}

function showPreview(imagePath, imageIndex) {
    var subImages = document.getElementById('previewPane').getElementsByTagName('IMG');
    if (subImages.length == 0) {
        var img = document.createElement('IMG');
        document.getElementById('previewPane').appendChild(img);
    } else img = subImages[0];

    if (displayWaitMessage) {
        document.getElementById('waitMessage').style.display = 'inline';
    }
    document.getElementById('largeImageCaption').style.display = 'none';
    img.onload = function() { hideWaitMessageAndShowCaption(imageIndex - 1); };
    img.src = imagePath;

}
function hideWaitMessageAndShowCaption(imageIndex) {
    document.getElementById('waitMessage').style.display = 'none';
    document.getElementById('largeImageCaption').innerHTML = imageGalleryCaptions[imageIndex];
    document.getElementById('largeImageCaption').style.display = 'none';

}
window.onload = initSlideShow;