$.fn.slideshow = function(options) {
  var settings = {
    timeout: '2000',
    type: 'sequence'
  }
  if(options)
    $.extend(settings, options);

  this.css('position', 'relative');
  var slides = this.find('img').get();
  for ( var i = 0; i < slides.length; i++ ) {
    $(slides[i]).css('zIndex', slides.length - i).css('position', 'absolute').css('top', '0').css('left', '0');
  }
  if ( settings.type == 'sequence' ) {
    setTimeout(function(){
      $.slideshow.next(slides, settings, 1, 0);
    }, settings.timeout);
  }
  else if ( settings.type == 'random' ) {
    setTimeout(function(){
      do { current = Math.floor ( Math.random ( ) * ( slides.length ) ); } while ( current == 0 )
      $.slideshow.next(slides, settings, current, 0);
    }, settings.timeout);
  }
  else {
    alert('type must either be \'sequence\' or \'random\'');
  }
};
$.fn.slideshow_stop = function() {
  $.slideshow.stop();
}
$.slideshow = function() {}
$.slideshow.stop = function () {
  if (this.j != 'undefined') {
    clearTimeout(this.j);
  }
}
$.slideshow.next = function (slides, settings, current, last) {
  for (var i = 0; i < slides.length; i++) {
    $(slides[i]).css('display', 'none');
  }
  $(slides[last]).css('display', 'block').css('zIndex', '0');
  $(slides[current]).css('zIndex', '1').fadeIn('slow');

  if ( settings.type == 'sequence' ) {
    if ( ( current + 1 ) < slides.length ) {
      current = current + 1;
      last = current - 1;
    }
    else {
      current = 0;
      last = slides.length - 1;
    }
  }
  else if ( settings.type == 'random' ) {
    last = current;
    while (	current == last ) {
      current = Math.floor ( Math.random ( ) * ( slides.length ) );
    }
  }
  else {
    alert('type must either be \'sequence\' or \'random\'');
  }
  this.j = setTimeout((function(){$.slideshow.next(slides, settings, current, last);}), settings.timeout);
}

function set_slideshow(slideshow, slideset, slidesets, path, timeout) {
  slideshows = $(".slideshow");
  if (timeout == undefined) {
    timeout = 1000;
  }
  if (slideshow.attr("slideset") != slideset) {
    slideshows.slideshow_stop();
    slideshows.removeAttr("slideset")
    slideshows.find("img").remove().end();
    for (i=1; i <= slidesets[slideset]; i++) {
      slideshow.append("<img src='"+path+"/"+slideset+i+".jpg'>");
    }
    slideshow.attr("slideset", slideset),
    slideshow.slideshow({	timeout: timeout });
  }
}