function slide(src, url) {
    this.src = src;
    
    if(url){
        this.url = url;
    }else{
        this.url = '';
    }    

  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.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_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();
    }

    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.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.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.setPauseBtn = function() {
        this.getElementById("sscntrl_pause").style.display = "none";
        this.getElementById("sscntrl_play").style.display = "";
    }

    this.setPlayBtn = function() {
        this.getElementById("sscntrl_pause").style.display = "";
        this.getElementById("sscntrl_play").style.display = "none";
    }
}

function fadeIn(objId, opacity) {
    if (document.getElementById) {
        obj = document.getElementById(objId);
        if (opacity <= 100) {
            setOpacity(obj, opacity);
            opacity += 3;
            window.setTimeout("fadeIn('" + objId + "'," + opacity + ")", 10);
        }
    }
}

function setOpacity(obj, opacity) {
    opacity = (opacity == 100) ? 99.999 : opacity;
    obj.style.filter = "alpha(opacity:" + opacity + ")";
    obj.style.KHTMLOpacity = opacity / 100;
    obj.style.MozOpacity = opacity / 100;
    obj.style.opacity = opacity / 100;
}