var currentIndex;
var obj;
var t;
var sliding = null;
var settings = null;

jQuery.fn.slider = function(options) {

		if (!options.slideClass || options.slideClass == "") {
				var error = new Error();
				error.message = "No slide class has been supplied";
		}

		settings = options;

		if (!options.slideDuration || !parseInt(options.slideDuration)) {
				options.slideDuration = 4000;
		}

		if (!options.slideOffet || !parseInt(options.slideOffet)) {
				options.slideOffet = '500px';
		}

		if (!options.fadeOutDuration || !parseInt(options.fadeOutDuration)) {
				options.fadeOutDuration = 4000;
		}

		if (!options.fadeInDuration || !parseInt(options.fadeInDuration)) {
				options.fadeInDuration = 4000;
		}

		return this.each(function() {
				$(options.slideClass, this).hide();
				$(options.slideClass + ":eq(0)", this).show();
				currentIndex = 0;
				obj = this;
				t = setTimeout(function(){ slide(); }, settings.slideDuration);
		});
};

function slide(speed)
{
		clearTimeout(t);
		if(!sliding) {
				sliding = true;
				var current = $(settings.slideClass + ":eq(" + currentIndex + ")", obj);
				currentIndex++;
				if (currentIndex > $(settings.slideClass, obj).size() - 1) {
						currentIndex = 0;
				}
				var next = 	$(settings.slideClass + ":eq(" + currentIndex + ")", obj);
				next.fadeIn(settings.fadeOutDuration);
				current.fadeOut(settings.fadeOutDuration, function(){
						sliding = false;
						t = setTimeout(function(){ slide(settings.fadeOutDuration); }, settings.slideDuration);
				});
		}
}

function slideBack(speed)
{
		clearTimeout(t);
		if(!sliding) {
				sliding = true;
				var current = $(settings.slideClass + ":eq(" + currentIndex + ")", obj);
				
				currentIndex--;
				if (currentIndex < 0) {
						currentIndex = $(settings.slideClass, obj).size() - 1;
				}
				var next = 	$(settings.slideClass + ":eq(" + currentIndex + ")", obj);
				
				next.show('fade', { direction: "left" }, settings.fadeInDuration);
				current.hide('fade', { direction: "right" }, settings.fadeOutDuration, function(){
						sliding = false;
						t = setTimeout(function(){ slide(settings.fadeOutDuration); }, settings.slideDuration);
				});

		}
}

(function($){
	  $.fn.shuffle = function() {
	    return this.each(function(){
	      var items = $(this).children();
	      return (items.length)
	        ? $(this).html($.shuffle(items))
	        : this;
	    });
	  }
	 
	  $.shuffle = function(arr) {
	    for(
	      var j, x, i = arr.length; i;
	      j = parseInt(Math.random() * i),
	      x = arr[--i], arr[i] = arr[j], arr[j] = x
	    );
	    return arr;
	  }
})(jQuery);