//
// Project  Name: fitpregnancy.com
// File / Folder: /docs/2007/js/slideshow.js
// File Language: javascript
// Copyright (C): 2007 The Richard Group, Inc.
// First  Author: Liam Bryan
// First Created: 2007.08.07 07:40:35
// Last Modifier: Liam Bryan
// Last Modified: 2007.08.17 12:57:02

var slideshowLooper;

function linkSlide(node){
    var images = node.getElementsByTagName('img');
    for (var n = 0; n < images.length; ++n) {
        if (images[n].className.indexOf('backButton') > -1) {
            images[n].onclick = slideBack;
        }
        else 
            if (images[n].className.indexOf('pauseButton') > -1) {
                images[n].onclick = function(){
                    clearInterval(slideshowLooper);
                };
            }
            else 
                if (images[n].className.indexOf('forwardButton') > -1) {
                    images[n].onclick = slideForward;
                }
    }
}

function slideBack(){
    var slides = document.getElementById('slideshow').childNodes;
    var previousIndex = null;
    for (var n = 0; n < slides.length; ++n) {
        var current = slides[n];
        if (!current.className || current.className.indexOf('slide') < 0) {
            continue;
        }
        
        if (current.className.indexOf('active') > -1) {
            current.className = current.className.replace(/ ?active/g, '');
            if (previousIndex != null) {
                break;
            }
        }
        
        previousIndex = n;
    }
    slides[previousIndex].className += ' active';
}

function slideForward(){
    var slides = document.getElementById('slideshow').childNodes;
    var activateNext = false;
    var firstSlideIndex = null;
    for (var n = 0; n < slides.length; ++n) {
        var current = slides[n];
        if (!current.className || current.className.indexOf('slide') < 0) {
            continue;
        }
        if (firstSlideIndex == null) {
            firstSlideIndex = n;
        }
        
        if (activateNext) {
            current.className += ' active';
            activateNext = false;
        }
        else 
            if (current.className.indexOf('active') > -1) {
                current.className = current.className.replace(/ ?active/g, '');
                activateNext = true;
            }
    }
    if (activateNext) {
        slides[firstSlideIndex].className += ' active';
    }
}

function slideshowLoop(){
    slideshowLooper = window.setInterval(slideForward, 4000);
}

function rgSlideshow(){
    var slides = document.getElementById('slideshow').childNodes;
    for (var n = 0; n < slides.length; ++n) {
        if (slides[n].className && slides[n].className.indexOf('slide') > -1) {
            linkSlide(slides[n]);
        }
    }
    slideshowLoop();
}

var slideshowOldOnload = window.onload;
window.onload = function(){
    if (slideshowOldOnload) {
        slideshowOldOnload();
    }
    rgSlideshow();
}