(function($){
    $.fn.Carrousel = function(params) {
        
        var speed = (params.speed !== undefined) ? params.speed : 500;
        var interval = (params.interval !== undefined) ? params.interval : 5000;
        var auto = (params.auto !== undefined) ? params.auto : 1;
        var center = (params.center !== undefined) ? params.center : 0;
        var addnextprev = (params.addnextprev !== undefined) ? params.addnextprev : 0;
        var livenextprev = (params.livenextprev !== undefined) ? params.livenextprev : 1;

        var obj = $(this);
        var count = $(obj).find('li').size();
        var timer = 1;
        var ready = 1;

        function setupCarrousel() {
            var item_width = $(obj).find('li').width();
            var item_height = $(obj).find('li').height();
            var list_width = 0;

            $(obj).find('img').each(function() {
                list_width += $(this).closest('li').outerWidth();
                $(obj).find('ul').css('width',list_width);
            });

            $(obj).find('ul').css('height',item_height);
        }

        function autoSlide() {
            clearInterval(timer);
            timer = setInterval(function(){
                if(auto == 1) {
                    slide();
                }
            }, interval);
        }

        function slide(direction) {
            if(typeof(direction)==='undefined') direction = 'right';
            var holder_width = $(obj).children('.holder').width();
            var list_width = $(obj).children('.holder').children('ul').width();
            var step = Math.round(holder_width / 4);
            var pos_crnt = parseInt($(obj).find('ul').css('left'));
            var pos_max = -(list_width - holder_width);
            var pos_next;
            ready = 0;

            if(direction == 'left') {
                pos_next = pos_crnt+step;
            }

            if(direction == 'right') {
                pos_next = pos_crnt-step;
            }

            if(pos_next < pos_max || pos_next > 0) {
                if(Math.abs(pos_crnt) == Math.abs(pos_max)) {
                    pos_next = 0;
                } else {
                    pos_next = pos_max;
                }
            }
            
            $(obj).find('ul').delay(100).animate({
                left: pos_next
            },speed,function(){
                ready = 1;
            });
        }

        function centerCarrousel() {
            $(obj).find('ul').find('span.num').parent().click(function() {

                var auto = 0;
                var id = $(this).find('span.num').html();
                var item_width = $(obj).find('li').width();
                var step = Math.round($(obj).width() / item_width / 2);

                if(id>step) {
                    if(id>=(count-step)) {
                        pos_next = -(item_width*(count-$(obj).width() / item_width));
                    } else {
                        pos_next = -(item_width*(id-step));
                    }
                } else {
                    pos_next = 0;
                }
                $(obj).find('ul').delay(100).animate({
                    left: pos_next
                },speed,function(){
                    ready = 1;
                });

            });
        }

        function liveNextPrev() {
            $(obj).find('a.nextprev').click(function() {
                if($(this).hasClass('next') && ready == 1) {
                    slide('right');  
                }
                if($(this).hasClass('prev') && ready == 1) {
                    slide('left');
                }   
            });
        }

        return this.each(function(){

            setupCarrousel();

            if(center == 1) {
                centerCarrousel();
            }
            
            if(auto == 1) {
                autoSlide();
            }

            if(addnextprev == 1) {
                addNextPrev();
                liveNextPrev();
            }
            
            if(addnextprev == 0 && livenextprev == 1) {
                liveNextPrev();
            }

        });
    }
})(jQuery);