(function($) { //create closure
    $.fn.agile_carousel = function(options) 
	{	
    	var slide_containter_elem = $(this);
        var defaults = {
        	disable_on_first_last: "no",
            first_last_buttons: "no",
            first_slide_is_intro: "no",
            hover_next_prev_buttons: "no",
            intro_timer_length: "3000",
            intro_transtion: "no",
            next_prev_buttons: "yes",
            number_slides_visible: "3",
            pause_button: "no",
            slide_buttons: "no",
            slide_captions: "no",
            slide_directory: "slides",
            doctype: "html",
            slide_links: "no",
            slide_number_display: "no",
            timer_length: "7000",
            timer_on: "yes",
            transition_duration: 1000,
            transition_easing: "swing",
            transition_type: "carousel",
            water_mark: "no"
        };
		var opts = $.extend(defaults, options);
        
        carousel();
		
		function carousel()
		{
			// global variables (evil)
           	var button_class = "slide_1";
            var curr_slide_id = "slide_1";
            var curr_slide_id_number = 1;
            var next_slide_id_number = 1;
			var next_slide_id = "";
            var slideshow_paused = "not_paused";
            var transition_type = defaults.transition_type;
            var slide_finder = $("#slide_holder_inner div.slide");
            var slide_id_array = [];
            var slides_index_counter = 0;
            slide_finder.each(function() {
                    slide_id_array[slides_index_counter] = $(this).attr("id");
                    slides_index_counter++;
			});
            var slide_captions_array = defaults.slide_captions.split("|");
            var slide_height = $('#slide_holder_inner').height();
            var half_slide_height_raw = slide_height / 2;
            var half_slide_height = parseFloat(half_slide_height_raw);
            var slide_holder_width = $(slide_containter_elem).width();
            var slide_holder_height = $(slide_containter_elem).height();
            var slide_holder_inner_width = $('#slide_holder_inner').width();
            var slide_holder_inner_height = $('#slide_holder_inner').height();
            var slide_holder_inner_width_px = slide_holder_inner_width + 'px';
            var slide_holder_inner_height_px = slide_holder_inner_height + 'px';
            // all_slides_width_raw = slide_holder_inner_width * slide_id_array.length;
            var width_per_slide = slide_holder_inner_width / defaults.number_slides_visible;
            width_per_slide = Math.floor(width_per_slide);
            var all_slides_width_raw = slide_id_array.length * width_per_slide;
            all_slides_width_raw = Math.floor(all_slides_width_raw);
            var all_slides_width = all_slides_width_raw + 'px';
            var slide_finder_array_length = slide_finder.length;
            var carousel_tranition_number_slides_visible = defaults.carousel_tranition_number_slides_visible;
            var num_slides_vis = parseFloat(defaults.number_slides_visible);
			var slideshow_timer = "";
            // set up the carousel
            // hide all the slides except slide_1
            $('#intro').remove();
            $('#slide_buttons').show();
            $('#slide_holder_inner div.slide:not(#slide_1)').hide();
            $('#slide_1').css("z-index", "0");
            $('#slide_holder_inner .pause_button').show();
            // initial highlighted and rollover effect for thumb images
            $("#slide_buttons li").removeAttr("id");
            $("#slide_buttons .slide_1").attr("id", "button_selected");
            // disable prev button
            if (defaults.disable_on_first_last == 'yes') {
                $('.prev_button').attr('class', 'prev_button_disabled');
            }

            Array.prototype.inArray = function(value)
            // Returns true if the passed value is found in the
            // array. Returns false if it is not.
            {
                var i;
                for (i = 0; i < this.length; i++) {
                    // Matches identical (===), not just similar (==).
                    if (this[i] === value) {
                        return true;
                    }
                }
                return false;
            };
            slide_finder.each(function() {
				// update slide number display
                update_slide_number_display = function() {
                	if (defaults.slide_number_display == "yes") {
                    	var id_to_split = curr_slide_id;
                        var the_currrent_slide_number_array = id_to_split.split("_");
                        var the_current_slide_number = the_currrent_slide_number_array.pop();
                        $("#slide_number_display span").html(the_current_slide_number + " of" + " <span>" + slide_id_array.length + "</span>");
                            //  $("#slide_number_display span").html(the_current_slide_number);
                    } // if
                } // update_slide_number_display
                if (defaults.slide_number_display == "yes") {
                	update_slide_number_display();
                }
                    // for slide caption display
			} // change_slide_caption
            ) // each
            // pause button 
            pause = function() {
                if (defaults.timer_on == "yes") {
                    clearInterval(slideshow_timer);
                };
                $("#pause_button span").html("play");
                slideshow_paused = "paused";
                $("#pause_button").attr("class", "paused_button");
            } // function
			change_slide_caption = function() {
                if (defaults.slide_captions != "no") {
                    var curr_caption = slide_captions_array[curr_slide_id_number - 1];
                    if (curr_caption == null) {
                        curr_caption = "";
                    }
                    $("#slide_captions span").html(curr_caption);
                } // if
            } // if
            change_slide_caption();

			// for jquery ui effects transition
            if (defaults.transition_type == 'fold') {
                options_object = {
                    'size': half_slide_height,
                    'easing': defaults.transition_easing
                }
            } else {
                options_object = {
                    'easing': defaults.transition_easing
                };
            }
            if ((defaults.jquery_ui_effect_param != null) && (defaults.jquery_ui_effect_value != null)) {
                var jquery_ui_effect_param = defaults.jquery_ui_effect_param;
                // handle string vs integer
                if ((defaults.jquery_ui_effect_param == "distance") || (defaults.jquery_ui_effect_param == "number") || (defaults.jquery_ui_effect_param == "percent") || (defaults.jquery_ui_effect_param == "size") || (defaults.jquery_ui_effect_param == "times") || (defaults.jquery_ui_effect_param == "direction")) {
                    var jquery_ui_effect_value = defaults.jquery_ui_effect_value;
                } else {
                    jquery_ui_effect_value = "'" + defaults.jquery_ui_effect_value + "'";
                }
                options_object[jquery_ui_effect_param] = jquery_ui_effect_value;
            }
            // end for jquery ui effects transition

            // for carousel transition - position slides in a row
            if (defaults.transition_type == 'carousel') {
                $(".slide").show();
                for (i = 0; i < slide_finder_array_length; i++) {
                    var the_slide = slide_finder[i];
                    var x_pos = (width_per_slide) * i;
                    $(the_slide).css('left', x_pos);
                } // for
                $('#row_of_slides').css('width', all_slides_width);
            } // if
            // for carousel transition with multiple slides
            var x_position_array = [];
            var slidestop_array = [];
            var sliced_slidestop_array = [];
            var next_slidestop_array = [];
            var prev_slidestop_array = [];
			var slidestop = "";
			var the_next_slidestop = "";
			var the_prev_slidestop = "";
			var next_counter = "";
			var prev_counter = "";
			for (i = 0; i < slide_id_array.length; i++) {
                var test_me_for_float = (i) / defaults.number_slides_visible;
                if (i == 0 || (test_me_for_float == parseInt(test_me_for_float) && test_me_for_float == parseFloat(test_me_for_float))) {
                    slidestop = 'yes';
                    var the_x_pos = width_per_slide * (i) * -1;
                    the_next_slidestop = (1 + i + num_slides_vis);
                    if (the_next_slidestop > slide_id_array.length) {
                        the_next_slidestop = 1;
                    }
                    next_slidestop_array[i] = the_next_slidestop;
                    the_prev_slidestop = (1 + i - num_slides_vis);
                    if (the_prev_slidestop < 1) {
                        the_prev_slidestop = slide_id_array.length - num_slides_vis + 1;
                    }
                    prev_slidestop_array[i] = the_prev_slidestop;
                    next_counter = num_slides_vis - 1;
                    prev_counter = 1;
                } else {
                    slidestop = 'no';
                    the_next_slidestop = i + 1 + next_counter;
                    if (the_next_slidestop > slide_id_array.length) {
                        the_next_slidestop = 1;
                    }
                    next_slidestop_array[i] = the_next_slidestop;
                    next_counter = next_counter + 1;
                    the_prev_slidestop = i + 1 - prev_counter;
                    if (the_prev_slidestop < 1) {
                        the_prev_slidestop == slide_id_array.length;
                    }
                    if (the_prev_slidestop > slide_id_array.length) {
                        the_prev_slidestop = 1;
                    }
                    prev_slidestop_array[i] = the_prev_slidestop;
                    prev_counter = prev_counter + 1;
                } // if			
                x_position_array[i] = the_x_pos;
                slidestop_array[i] = slidestop;
            } // for
            function carousel_transition() {
				// create array that stores desired x position per slide
                $('#row_of_slides').stop().animate({
                    "left": x_position_array[next_slide_id_number - 1]
                },
                {
                    "duration": defaults.transition_duration,
                    "easing": defaults.transition_easing
                });
            }
            // carousel transition
            function fade_transition() {
                $('#slide_holder_inner div.slide').each(function() {
                    if ($(this).attr('id') != curr_slide_id) {
                        $(this).hide();
                    } // if
                } // function
                ) // each
                $('#slide_holder_inner div[@id$="' + curr_slide_id + '"]').css("z-index", "50");
                $('#slide_holder_inner div[@id$="' + button_class + '"]').css("z-index", "100");
                $('#slide_holder_inner div[@id$="' + button_class + '"]').animate({
                    "opacity": "show"
                },
                {
                    "duration": defaults.transition_duration,
                    "easing": defaults.transition_easing
                });
            } //function fade
            function ui_effects_transition() {
                next_top_show_next = function() {
                    // all divs
                    $('#slide_holder_inner div.slide').show().css('z-index', '20');
                    // next div
                    $('#slide_holder_inner div[@id$="' + next_slide_id + '"]').css('z-index', '60');
                    // current div
                    $('#slide_holder_inner div[@id$="' + curr_slide_id + '"]').css('z-index', '50');
                    // the transition
                    $('#slide_holder_inner div[@id$="' + next_slide_id + '"]').stop().show(defaults.transition_type, options_object, defaults.transition_duration);
                }
                next_bottom_hide_curr = function() {
                    // all divs
                    $('#slide_holder_inner div.slide').show().css('z-index', '20');
                    // next div
                    var the_next_div = $('#slide_holder_inner div[@id$="' + next_slide_id + '"]').css('z-index', '50');
                    $(the_next_div).css('z-index', '1000');
                    // current div
                    $('#slide_holder_inner div[@id$="' + curr_slide_id + '"]').css('z-index', '60');
                    // the transition
                    $('#slide_holder_inner div[@id$="' + curr_slide_id + '"]').effect(defaults.transition_type, options_object, defaults.transition_duration);
                }
                if (defaults.transition_type == 'blind' || defaults.transition_type == 'bounce' || defaults.transition_type == 'clip' || defaults.transition_type == 'drop' || defaults.transition_type == 'fold' || defaults.transition_type == 'shake' || defaults.transition_type == 'slide' || defaults.transition_type == 'scale' || defaults.transition_type == 'pulsate') {
                    next_top_show_next();
                } else if (defaults.transition_type == 'explode' || defaults.transition_type == 'puff') {
                    next_bottom_hide_curr();
                } else {
                    next_top_show_next();
                }; // if
            } //function
            // scroll right
            function scroll_right_transition() {
                var slideshow_width = $('#slide_holder_inner').width();
                var n_slideshow_width = -1 * slideshow_width + 'px';
                $('#slide_holder_inner div[@id$="' + button_class + '"]').stop().show().css("left", n_slideshow_width);
                $('#slide_holder_inner div[@id$="' + button_class + '"]').stop().show().animate({
                    "left": 0
                },
                {
                    'easing': defaults.transition_easing
                },
                defaults.transition_duration);
                $('#slide_holder_inner div[@id$="' + curr_slide_id + '"]').stop().animate({
                    "left": slideshow_width
                },
                {
                    'easing': defaults.transition_easing
                },
                defaults.transition_duration);
            } // function
            // no effect transition
            function no_effect_transition() {
                $('#slide_holder_inner div[@id$="' + button_class + '"]').show();
                $('#slide_holder_inner div[@id$="' + curr_slide_id + '"]').hide();
            } // function
            function rotate_slides() {
                function transition_slides() {
                    // transition slides
                    if (curr_slide_id != button_class) {
                        if (transition_type == 'fade') {
                            fade_transition();
                        } else if (transition_type == 'no_transition_effect') {
                            no_effect_transition();
                        } else if (transition_type == 'scroll_right') {
                            scroll_right_transition();
                        } else if (transition_type == 'carousel') {
                            carousel_transition();
                        } else if (transition_type == 'blind' || transition_type == 'clip' || transition_type == 'drop' || transition_type == 'explode' || transition_type == 'fold' || transition_type == 'puff' || transition_type == 'slide' || transition_type == 'scale' || transition_type == 'pulsate') {
                            ui_effects_transition();
                        } else {
                            no_effect_transition();
                        } // else
                    }; // if
                    curr_slide_id_number = next_slide_id_number;
                    function make_curr_slide_id() {
                        curr_slide_id = button_class;
                    };
                    make_curr_slide_id();
                } // transition_slides()
                transition_slides();

                function animate_slides() {} // animate_slides()
            } // rotate_slides()
            function change_button_class(button_class) {
                $("#slide_buttons li").removeAttr("id");
                $("#slide_buttons li").each(function() {
                    if ($(this).attr("class") == button_class) {
                        $(this).attr("id", "button_selected");
                    } // if
                } // function
                ); // each
            } // change_button_class
            // functions for pause button
            $(".pause_button").click(function() {
                if (slideshow_paused == "paused") {
                    // skip to next slide
                    skip('next');
                    if (defaults.timer_on == "yes") {
                        slideshow_timer = setInterval("skip('next')", defaults.timer_length);
                    } //if
                    slideshow_paused = "not_paused";
                    $("#pause_button span").html("pause");
                    $(this).attr("class", "pause_button");
                } else if (slideshow_paused == "not_paused") {
                    clearInterval(slideshow_timer);
                    slideshow_paused = "paused";
                    $(this).attr("class", "paused_button");
                    pause();
                }
            } // function
            ) // click
            skip = function(direction) {
                // identify next slide class
                var curr_slide_id_string = curr_slide_id.toString();
                var split_curr_slide_id_string = curr_slide_id.split("_");
                curr_slide_id_string = split_curr_slide_id_string.pop();
                curr_slide_id_number = parseFloat(curr_slide_id_string);
                if (direction == 'next') {
                    next_slide_id_number = curr_slide_id_number + 1;
                    if (defaults.transition_type == 'carousel') {
                        var the_index_to_use = curr_slide_id_number - 1;
                        next_slide_id_number = next_slidestop_array[the_index_to_use];
                    }
                } else if (direction == 'prev') {
                    next_slide_id_number = curr_slide_id_number - 1;
                    if (defaults.transition_type == 'carousel') {
                        var the_index_to_use = curr_slide_id_number - 1;
                        next_slide_id_number = prev_slidestop_array[the_index_to_use];
                    }
                } else if (direction == 'first') {
                    next_slide_id_number = slide_id_array.length;
                    curr_slide_id_number = 1;
                } else if (direction == 'last') {
                    next_slide_id_number = 1;
                    curr_slide_id_number = slide_id_array.length;
                } else {
                    next_slide_id_number = direction;
                };
                next_slide_id = "slide_" + next_slide_id_number;
                // if next slide is after the last slide, then go to first slide
                if (next_slide_id_number > slide_id_array.length) {
                    next_slide_id = "slide_1";
                    curr_slide_id_number = slide_id_array.length;
                    next_slide_id_number = 1;
                    // if next slide is before the first slide, then go to first slide	
                } else if (next_slide_id_number < 1) {
                    next_slide_id = "slide_" + slide_id_array.length;
                    next_slide_id_number = slide_id_array.length;
                } // else 
                button_class = next_slide_id;
                // animate to next slide
                rotate_slides();
                change_button_class(button_class);
                if (defaults.slide_number_display == "yes") {
                    update_slide_number_display();
                }
                change_slide_caption();
                // disable first and last buttons
                if ((defaults.disable_on_first_last == 'yes' && ((next_slide_id_number == slide_id_array.length) || (next_slide_id_number == slide_id_array.length - num_slides_vis + 1)))) {
                    $('#next_button').attr('class', 'next_button_disabled');
                    $('#hover_next_button').attr('class', 'hover_next_buttondisabled');
                    $('#last_button').attr('class', 'last_buttondisabled');
                } else {
                    $('#next_button').attr('class', 'next_button');
                    $('#hover_next_button').attr('class', 'hover_next_button');
                    $('#last_button').attr('class', 'last_buton');
                }

                if ((defaults.disable_on_first_last == 'yes' && ((next_slide_id_number == 1) || (next_slide_id_number == num_slides_vis)))) {
                    $('#prev_button').attr('class', 'prev_button_disabled');
                    $('#hover_prev_button').attr('class', 'hover_prev_button_disabled');
                    $('#first_button').attr('class', 'first_button_disabled');
                } else {
                    $('#prev_button').attr('class', 'prev_button');
                    $('#hover_prev_button').attr('class', 'hover_prev_button');
                    $('#first_button').attr('class', 'first_button');
                }
            } //skip
            if (defaults.timer_on == "yes") {
                slideshow_timer = setInterval("skip('next')", defaults.timer_length);
            } // if
            // functions for clicking slide buttons
			$("#slide_buttons li").each(function() {
            	// add click functionality to buttons
                $(this).click(function() {
					button_class = $(this).attr("class");
                    change_button_class(button_class);
                    // declare next_slide_id_number
                    var split_button_class_string = button_class.split("_");
                    var button_class_string = split_button_class_string.pop();
                    next_slide_id_number = parseFloat(button_class_string);
                    pause();
                    skip(next_slide_id_number);
                    return (false);
                }); // click
            }); //each
            // remove unused slide buttons for carousel transtion
            if (defaults.transition_type == 'carousel') {
                $("#slide_buttons li").each(function() {
                    test_the_button_number = $(this).text() - 1;
                    if (slidestop_array[test_the_button_number] == "no") {
                        $(this).remove();
                    } // if
                } // function
                ) // each
            } // if
            // functions for clicking prev & next buttons
            // next button
            $(".next_button").click(function() {
                if (defaults.disable_on_first_last != 'yes') {
                    skip('next');
                    pause();
                } else if ((defaults.disable_on_first_last == 'yes' && next_slide_id_number == slide_id_array.length) || (next_slide_id_number == (slide_id_array.length - num_slides_vis + 1))) {
                    pause();
                } else {
                    skip('next');
                    pause();
                }
                // if
            } // function
            ); // click	
            $(".prev_button, .prev_button_disabled").click(function() {
                if (defaults.disable_on_first_last != 'yes') {
                    skip('prev');
                    pause();
                } else if ((defaults.disable_on_first_last == 'yes' && curr_slide_id_number == 1) || (defaults.disable_on_first_last == 'yes' && next_slide_id_number == num_slides_vis)) {
                    pause();
                } else {
                    skip('prev');
                    pause();
                }
                // if
            } // function
            ); // click	
            if (defaults.hover_next_prev_buttons == "yes") {
                $(".hover_button").fadeTo(1, 0,
                function() {
                    $(this).css("display", "block")
                });
                $('#hover_prev_button').hover(function() {
                    $("#hover_prev_button").stop().fadeTo("slow", 0.95);
                },
                // function
                function() {
                    $("#hover_prev_button").stop().fadeTo("slow", 0.00);
                }); // hover
                $('#hover_next_button').hover(function() {
                    $("#hover_next_button").stop().fadeTo("slow", 0.95);
                },
                // function
                function() {
                    $("#hover_next_button").stop().fadeTo("slow", 0.00);
                }); // hover
            } // if
            $("#first_button").click(function() {
                skip('last');
                pause();
            } // function
            ); // click	
            $("#last_button").click(function() {
                pause();
                skip('first');
            } // function
            ); // click	
        } // carousel
    } // function agile_carousel
})(jQuery);