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.URL = 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;
    }
  }
}

function slides(slidename) {
  this.name = slidename;
  this.repeat = true;
  this.prefetch = -1;
  this.image;
  this.textid;
  this.timeout = 6000;
  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_use_function == 'function') {
      this.pre_use_function();
    }
    var slide = this.slides[ this.current ];
    var dofilter = false;
    slide.load();
    this.image.src = slide.image.src;
    this.display_text();
    if (typeof this.post_use_function == 'function') {
      this.post_use_function();
    }
    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.go_slide = function(n) {
    if (n == -1) {
      n = this.slides.length - 1;
    }  
    if (n < this.slides.length && n >= 0) {
      this.current = n;
    }  
    this.update();
	this.pause();
  }
  this.next = function() {
    if (this.current < this.slides.length - 1) {
      this.current++;
    } else if (this.repeat) {
      this.current = 0;
    }
    this.update();
	this.pause();
  }
  this.previous = function() {
    if (this.current > 0) {
      this.current--;
    } else if (this.repeat) {
      this.current = this.slides.length - 1;
    }  
    this.update();
	this.pause();
  }
  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.textid) {
      r = this.getElementById(this.textid);
      if (!r) { return false; }
      if (typeof r.innerHTML == 'undefined') { return false; }
      r.innerHTML = text;
    }
  }
  this.URL = function() { 
    this.slides[ this.current ].URL();
  }
  this.loop = function() {
    if (this.current < this.slides.length - 1) {	  
      next_slide = this.slides[this.current + 1];
        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;
  }
  this.set_textid = function(textidstr) {
    this.textid = textidstr;
    this.display_text();
  }
}