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

jQuery.fn.fader = 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();
				$(options.slideClass + ":last", this).show();
				currentIndex = 0;
				obj = this;
				if($(options.slideClass, this).size() > 1) { 
					t = setTimeout(function(){ slide(); }, settings.slideDuration);
				}
		});
};

function slide(speed)
{
		clearTimeout(t);
		if(!sliding) {
				sliding = true;
				
				var last = $(settings.slideClass + ":last", obj);
				
				var first = $(settings.slideClass + ":first", obj);
				last.after(first);
				first.fadeIn(settings.fadeInDuration, function(){
						sliding = false;
						t = setTimeout(function(){ slide(settings.fadeOutDuration); }, settings.slideDuration);
						last.fadeOut(settings.fadeOutDuration);
				});
		}
}

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('slide', { direction: "right" }, settings.fadeInDuration);
				current.hide('slide', { direction: "left" }, settings.fadeOutDuration, function(){
						sliding = false;
						t = setTimeout(function(){ slide(settings.fadeOutDuration); }, settings.slideDuration);
				});

		}
}