// Simple Slideshow Script 1.0 - By Chris
// Note: Slideshow photo filenames must have two digit numbers.
// For example, photo00.jpg is correct.  photo0.jpg is not.
// The first photo displayed is always the one referenced in the <IMG> tag.
// This script also smartly preloads only the photos it needs before displaying them.

////////////////////
// USER VARIABLES //
////////////////////

// Total number of photos available
var total_photos = 8;

// Path to the photos if not in same place as script (eg. "http://www.site.com/photos/")
var path = "images/slideshow/";

// Beginning of filename (eg. "photo" for "photo00.jpg");
var filename = "photo";

// The file extension (eg. ".jpg" for "photo00.jpg");
var extension = ".jpg";

// Delay in seconds before next photo appears
var delay = 4;

////////////////////
// SLIDESHOW CODE //
////////////////////

var timeout;
var next_photo;
var prev_photo = 0;
var cache = new Array();

function cache_next_photo() {
  var random_num = Math.round(Math.random() * (total_photos - 1));
  if (random_num == prev_photo) {
    cache_next_photo();
  } else {
    next_photo = random_num;
    var temp_num;
    if (cache[next_photo] == null) {
      if (next_photo < 10) { temp_num = "0" + next_photo; } else { temp_num = next_photo; }
      cache[next_photo] = new Image();
      cache[next_photo].src = path + filename + temp_num + extension;
    }
    timeout = setTimeout('changePhoto()', (delay*1000));
  }
}

function changePhoto() {
  clearTimeout(timeout);
  document.images.slideshow.src = cache[next_photo].src;
  prev_photo = next_photo;
  cache_next_photo();
}

function startSlideshow() {
  cache_next_photo();
}