/***********************************************************************************************
  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=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/slides/' + 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/slides/' + 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;
    imageGalleryWidth = document.getElementById('galleryContainer').offsetWidth -80;
    maxGalleryXPos = imageGalleryObj.offsetLeft;
    minGalleryXPos = imageGalleryWidth - document.getElementById('slideEnd').offsetLeft;
    
    var divs = imageGalleryObj.getElementsByTagName('div');
    var cpt = 0;
    for(var no=0;no<divs.length;no++){
      if(divs[no].className=='imageCaption') {
        imageGalleryCaptions[cpt] = divs[no].innerHTML;
        cpt++;
      }
    }
    var slideshowImages = imageGalleryObj.getElementsByTagName('img');
    for(var no=0;no<slideshowImages.length;no++){
      slideshowImages[no].onmouseover = showImage;
    }
    
    gallerySlide();
  }

  function showPreview(imagePath,imageIndex,imageNum,imageAltTitle){
    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('playMessage').style.display='none';
    }
    document.getElementById('largeImageCaption').style.display='none';
    img.onload = function() { hideWaitMessageAndShowCaption(imageIndex-1); };
    img.src = imagePath;
    img.title = imageAltTitle;
    img.alt = imageAltTitle;
    document.getElementById('linkvideo').href = "chaine_sshome.php?id="+imageNum;
  }

  function hideWaitMessageAndShowCaption(imageIndex)
  {
    document.getElementById('waitMessage').style.display='none';
    document.getElementById('playMessage').style.display='inline';
    if ( imageGalleryCaptions[imageIndex] != null )
      document.getElementById('largeImageCaption').innerHTML = imageGalleryCaptions[imageIndex];
    else
      document.getElementById('largeImageCaption').innerHTML = "<span style=\"color:gray;\">Chargement en cours ...</span>";
    document.getElementById('largeImageCaption').style.display='block';
  }
  window.onload = initSlideShow;