function slide(src, link, text, target, attr) {
  this.src = src;
  if (document.images)
    this.image = new Image();
  this.loaded = false;
  this.load = function() {
    if (!document.images)
       return;
    if (!this.loaded) {
      this.image.src = this.src;
      this.loaded = true;
    }
  }
  this.hotlink = function() {
    return;
  }
}

function slideshow( slideshowname ) {
  this.name = slideshowname;
  this.repeat = true;
  this.prefetch = 0;
  this.image;
  this.timeout = 5000;
  this.slides = new Array();
  this.current = 0;
  this.timeoutid = 0;

  this.addSlide = function(slide) {
    var i = this.slides.length;
    if (this.prefetch == -1)
      slide.load();
    this.slides[i] = slide;
  }

  this.play = function(timeout) {
    this.pause();
    if (timeout)
      this.timeout = timeout;
    this.timeoutid = setTimeout(this.name + ".loop()", this.timeout);
  }

  this.pause = function() {
    if (this.timeoutid != 0) {
      clearTimeout(this.timeoutid);
      this.timeoutid = 0;
    }
  }

  this.update = function() {
    if (!this.validImage())
      return;
    var slide = this.slides[this.current];
    slide.load();
    this.image.src = slide.image.src;
    if (this.prefetch > 0) {
      var next, prev, count;
      next = this.current;
      prev = this.current;
      count = 0;
      do {
        if (++next >= this.slides.length)
          next = 0;
        if (--prev < 0)
          prev = this.slides.length - 1;
        this.slides[next].load();
        this.slides[prev].load();
      } while (++count < this.prefetch);
    }
  }

  this.next = function() {
    if (this.current < this.slides.length - 1) {
      this.current++;
    } else if (this.repeat) {
      this.current = 0;
    }
    this.update();
  }

  this.previous = function() {
    if (this.current > 0) {
      this.current--;
    } else if (this.repeat) {
      this.current = this.slides.length - 1;
    }
    this.update();
  }

  this.shuffle = function() {
    var i, i2, slides_copy, slides_randomized;
    slides_copy = new Array();
    for (i = 0; i < this.slides.length; i++)
      slides_copy[i] = this.slides[i];
    slides_randomized = new Array();
    do {
      i = Math.floor(Math.random()*slides_copy.length);
      slides_randomized[ slides_randomized.length ] = slides_copy[i];
      for (i2 = i + 1; i2 < slides_copy.length; i2++)
        slides_copy[i2 - 1] = slides_copy[i2];
      slides_copy.length--;
    } while (slides_copy.length);
    this.slides = slides_randomized;
  }

  this.loop = function() {
    if (this.current < this.slides.length - 1) {
      next_slide = this.slides[this.current + 1];
      if (next_slide.image.complete == null || next_slide.image.complete) {
        this.next();
      }
    } else {
      this.next();
    }
    this.play();
  }

  this.validImage = function() {
    if (!this.image)
      return false;
    else
      return true;
  }

}