function slide(src) 
{
  this.src = src;
  this.timeout = 10000;

  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;
    }
  }
  //--------------------------------------------------
}


function slideshow( slideshowname ) 
{
  this.name = slideshowname;
  this.repeat = true;
  this.prefetch = -1;
  this.image;

  this.slides = new Array();
  this.current = 0;
  this.timeoutid = 0;

  //--------------------------------------------------
  
  this.add_slide = 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;
    }
  
    if (typeof this.slides[ this.current ].timeout != 'undefined') 
    {
      timeout = this.slides[ this.current ].timeout;
    }
	else
	{
      timeout = this.timeout;
    }

    this.timeoutid = setTimeout( this.name + ".loop()", timeout);
  }

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

  //--------------------------------------------------
  this.update = function() 
  {
    if (! this.valid_image()) 
	{ 
	  return; 
	}

    if (typeof this.pre_update_hook == 'function') 
	{
      this.pre_update_hook();
    }

    var slide = this.slides[ this.current ];

    var dofilter = false;
    if (this.image && typeof this.image.filters != 'undefined' && typeof this.image.filters[0] != 'undefined') 
	{
      dofilter = true;
    }

    slide.load();
  
    if (dofilter) 
	{

      if (slide.filter && this.image.style && this.image.style.filter) 
	  {
        this.image.style.filter = slide.filter;
      }

      this.image.filters[0].Apply();

    }

    this.image.src = slide.image.src;

    if (dofilter) 
	{
      this.image.filters[0].Play();
    }

    if (typeof this.post_update_hook == 'function') 
	{
      this.post_update_hook();
    }

    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.goto_slide = function(n) 
  {
 
    if (n == -1) 
	{
      n = this.slides.length - 1;
    }
  
    if (n < this.slides.length && n >= 0) 
	{
      this.current = n;
    }
  
    this.update();
  }

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

  //--------------------------------------------------
  this.getElementById = function(element_id) 
  {
    if (document.getElementById) 
	{
      return document.getElementById(element_id);
    }
    else if (document.all) 
	{
      return document.all[element_id];
    }
    else if (document.layers) 
	{
      return document.layers[element_id];
    } 
	else 
	{
      return undefined;
    }
  }
  
  //--------------------------------------------------
  this.set_image = function(imageobject) 
  {
    if (!document.images)
      return;
    this.image = imageobject;
  }

}