/************************************************************************************************************
Image Slideshow
Copyright (C) February 2005  DTHMLGoodies.com, Alf Magne Kalleland

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Dhtmlgoodies.com., hereby disclaims all copyright interest in this script
written by Alf Magne Kalleland.

Alf Magne Kalleland, 2005
Owner of DHTMLgoodies.com

************************************************************************************************************/


    var displayWaitMessage=false;    // 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;
        var galleryContainer = document.getElementById('galleryContainer');
        imageGalleryWidth = galleryContainer.offsetWidth - 80;
        maxGalleryXPos = imageGalleryObj.offsetLeft;
        minGalleryXPos = imageGalleryWidth - document.getElementById('slideEnd').offsetLeft;

        if (navigator.userAgent.indexOf('MSIE') >= 0) {
            var arrowWidth = document.getElementById('arrow_left').offsetWidth;
            var el = document.createElement('div');
            el.style.position = 'absolute';
            el.style.left = arrowWidth + 'px';
            el.style.width = (galleryContainer.offsetWidth - arrowWidth * 2) + 'px';
            el.style.overflow = 'hidden';
            el.style.height = '100%';

            document.getElementById('galleryContainer').appendChild(el);
            el.appendChild(document.getElementById('theImages'));
        }
        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;

    }
    window.onload = initSlideShow;