//==================================================
// slide object
//==================================================
function slide(src,link,text,target,attr) 
	{
		this.src = src;
		this.link = link;
		this.text = text;
		this.target = target;
		this.attr = attr;
		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() 
	{
	var mywindow;
	if (!this.link) return;
	if (this.target) 
		{
		if (this.attr) 
			{
			mywindow = window.open(this.link, this.target, this.attr);
			} else {
			mywindow = window.open(this.link, this.target);
			}
		if (mywindow && mywindow.focus) mywindow.focus();
			} else {
			location.href = this.link;
			}
		}
	}

//==================================================
// slideshow object
//==================================================
function slideshow( slideshowname ) {

  this.name = slideshowname;

  this.repeat = true;

  this.prefetch = -1;
  this.image;
  this.textid;
  this.textarea;
  this.timeout = 4000;
  this.slides = new Array();
  this.current = 0;
  this.timeoutid = 0;
  
  
  //--------------------------------------------------
  // Public methods
  //--------------------------------------------------
  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();
	}

	this.display_text();

	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;

		// Preload the slide image
		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.goto_random_slide = function(include_current) {
	var i;
	if (this.slides.length > 1) {
	  do {
		i = Math.floor(Math.random()*this.slides.length);
	  } while (i == this.current);
	  this.goto_slide(i);
	}
  }


  //--------------------------------------------------
  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.get_text = function() {
  
	return(this.slides[ this.current ].text);
  }


  //--------------------------------------------------
  this.get_all_text = function(before_slide, after_slide) {
  
	all_text = "";
  
	// Loop through all the slides in the slideshow
	for (i=0; i < this.slides.length; i++) {
  
	  slide = this.slides[i];
	
	  if (slide.text) {
		all_text += before_slide + slide.text + after_slide;
	  }
  
	}
  
	return(all_text);
  }


  //--------------------------------------------------
  this.display_text = function(text) {
	if (!text) {
	  text = this.slides[ this.current ].text;
	}
	if (this.textarea && typeof this.textarea.value != 'undefined') {
	  this.textarea.value = text;
	}
	if (this.textid) {

	  r = this.getElementById(this.textid);
	  if (!r) { return false; }
	  if (typeof r.innerHTML == 'undefined') { return false; }

	  r.innerHTML = text;
	}
  }


  //--------------------------------------------------
  this.hotlink = function() {
  
	this.slides[ this.current ].hotlink();
  }

  //--------------------------------------------------
  this.save_position = function(cookiename) {
  
	if (!cookiename) {
	  cookiename = this.name + '_slideshow';
	}
  
	document.cookie = cookiename + '=' + this.current;
  }


  //--------------------------------------------------
  this.restore_position = function(cookiename) {
  
	if (!cookiename) {
	  cookiename = this.name + '_slideshow';
	}
  
	var search = cookiename + "=";
  
	if (document.cookie.length > 0) {
	  offset = document.cookie.indexOf(search);
	  if (offset != -1) { 
		offset += search.length;
		end = document.cookie.indexOf(";", offset);
		if (end == -1) end = document.cookie.length;
		this.current = parseInt(unescape(document.cookie.substring(offset, end)));
		}
	 }
  }


  //--------------------------------------------------
  this.noscript = function() {
  
	$html = "\n";
	for (i=0; i < this.slides.length; i++) {
  
	  slide = this.slides[i];
  
	  $html += '<P>';
  
	  if (slide.link) {
		$html += '<a href="' + slide.link + '">';
	  }
  
	  $html += '<img src="' + slide.src + '" ALT="slideshow image">';
  
	  if (slide.link) {
		$html += "<\/a>";
	  }
  
	  if (slide.text) {
		$html += "<BR>\n" + slide.text;
	  }
  
	  $html += "<\/P>" + "\n\n";
	}
	$html = $html.replace(/\&/g, "&amp;" );
	$html = $html.replace(/</g, "&lt;" );
	$html = $html.replace(/>/g, "&gt;" );
  
	return('<pre>' + $html + '</pre>');
  }

  //--------------------------------------------------
  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) {
	// This method is deprecated; you should use
	// the following code instead:
	// s.image = document.images.myimagename;
	// s.update();

	if (!document.images)
	  return;
	this.image = imageobject;
  }

  //--------------------------------------------------
  this.set_textarea = function(textareaobject) {

	this.textarea = textareaobject;
	this.display_text();
  }

  //--------------------------------------------------
  this.set_textid = function(textidstr) {

	this.textid = textidstr;
	this.display_text();
  }
}