//You need an anonymous function to wrap around your function to avoid conflict  

(function($){  



//Attach this new method to jQuery  

$.fn.extend({   

    //This is where you write your plugin's name  

    slideshow: function(options) {  

        //Set the default values, use comma to separate the settings, example:  

        var defaults = {  

            //add defaults here 

            speed:1000,

            pause:4500,

            autoPlay:true

        }  

        

        var options =  $.extend(defaults, options);

        

        //Iterate over the current set of matched elements  

        return this.each(function() {  

            var obj = $(this); //Assign current element to variable

            var currentSlide = 0; //keep track of what slide we are on

            var images = obj.children("ul").wrap("<div class='slideshow-descriptions'></div>").children("li").hide().children("img"); //target all the images

            var timer = null//used as our timing interval

            

            //add and empty unordered list to add the images to

            obj.prepend("<div class='slideshow-images'><ul></ul></div>");

            

            //add slideshow controls

            obj.append("<div class='slideshow-controls'><a class='slideshow-prev' href='#'>Previous</a><a class='slideshow-next' href='#'>Next</a></div>");

            var prevBtn = $(".slideshow-prev", obj);

            var nextBtn = $(".slideshow-next", obj);

            

            //click functionality for control buttons

            $(nextBtn).click(function(){

                nextSlide();

                options.autoPlay = false;

                clearInterval(timer);

                return false;

            });

            $(prevBtn).click(function(){

                prevSlide();

                options.autoPlay = false;

                clearInterval(timer);

                return false;

            });

            

            //loop through the images and move them to the slideshow-images unordered list

            for (var i=0; i<images.length; i++){

                $(images[i]).remove().appendTo(".slideshow-images ul").wrap("<li><li>").parent().hide();

            }

            

            var slideshowImages = $(".slideshow-images li", obj); //slideshow images list items

            var slideshowDescriptions = $(".slideshow-descriptions li", obj); //slideshow descripton list items

            

            //hide the previous image and description and show the new ones

            function slideshow(){

                clearInterval(timer);

                //console.log("currentSlide " + currentSlide);

                $(".slideshow-images .current").fadeOut(options.speed).removeClass("current");

                $(".slideshow-descriptions .current").fadeOut(options.speed).removeClass("current");

                $(slideshowDescriptions[currentSlide]).fadeIn(options.speed).addClass("current");

                $(slideshowImages[currentSlide]).fadeIn(options.speed).addClass("current");

                

                if(options.autoPlay === true){

                    //console.log("autoPlay is true");

                    timer = setTimeout(nextSlide, options.pause);

                }

            }

            

            //add one to the slide count then play the slideshow

            function nextSlide(){

                //console.log("nextSlide");

                currentSlide++;

                //check to see if you are at the last slide and reset to the first

                if(currentSlide >= slideshowImages.length){

                    currentSlide = 0;

                }

                slideshow();

            }

            

            //remove one from the slide count then play the slideshow

            function prevSlide(){

                //console.log("prevSlide");

                currentSlide--;

                //check to see if you are the first slide and reset to the last

                if(currentSlide < 0){

                    currentSlide = slideshowImages.length-1;    

                }

                slideshow();

            }

            

            slideshow();

            

        });  

    }  

});  



//pass jQuery to the function,   

//So that we will able to use any valid Javascript variable name   

//to replace "$" SIGN. But, we'll stick to $ (I like dollar sign: ) )         

})(jQuery);