function slide(src,text) {
  this.src = src;
  this.text = text;
  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;
    }
  }
}

//==================================================
// slideshow functions etc
//==================================================
function slideshow( slideshowname ) {
  this.name = slideshowname;
  this.repeat = true;
  this.prefetch = -1;
  this.image;
  this.textid;
  this.textarea;
  this.slides = new Array();
  this.current = 0;
//----------------------------------------------------
  this.add_slide = function(slide) {
  
    var i = this.slides.length;
  
    if (this.prefetch == -1) {
      slide.load();
    }

    this.slides[i] = slide;
  }

  //--------------------------------------------------
  this.update = function() {
    if (! this.valid_image()) { return; }
  
    var slide = this.slides[ this.current ];

    slide.load();
 
    this.image.src = slide.image.src;
    this.display_text();

    // Do we need to pre-fetch images?
    if (this.prefetch > 0) {

      var next, prev, count;

      // Pre-fetch the next slide image(s)
      next = this.current;
      prev = this.current;
      count = 0;
      do {

        // Get the next and previous slide number
        // Loop past the ends of the slideshow if necessary
        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();

        // Keep going until we have fetched
        // the designated number of slides

      } 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() {
    // This method returns the text of the current slide
  
    return(this.slides[ this.current ].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; }

      // Update the text
      r.innerHTML = text;
    }
    _Ath_Img_X.innerHTML = this.current + 1;
    _Ath_Img_N.innerHTML = imgMax;
  }

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