function slide(src,link,text,target,attr) {
  this.text = text;

  if (document.images) {
    this.image = new Image();
  }
  
  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.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;
    }
  }
}

function slideshow( slideshowname ) {
  this.name = slideshowname;

  this.repeat = true;

  this.prefetch = 1;

  this.image;

  this.textid;

  this.textarea;

  this.timeout = 3000;

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


  this.add_slide = function(slide) {
    if (!document.images) { return; }
  
    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.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;

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

  this.get_all_text = function(before_slide, after_slide) {
  
    all_text = "";
  
    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.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 { // we're at the last slide
      this.next();
    }
    
    this.play( );
  }

  this.valid_image = function() {
  
    if (!this.image)
    {
      this.pause;
  
      window.status = "Error: slideshow image not initialized for " + this.name;
          
      return 0;
    }
    else {
      return 1;
    }
  }

  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;
    }
  }
  

}