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;
    }
  }
}

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;

  // Public methods
  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 ];

    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 (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.get_text = function() {
  
    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; }

      r.innerHTML = text;
    }
  }

  // Private methods
  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;
    }
  }
}