jQuery.fn.infiniteCarousel = function () {

    function repeat(str, num) {
        return new Array( num + 1 ).join( str );
    }
  
    return this.each(function () {
        var $wrapper = jQuery('.slides', this).css('overflow', 'hidden');
		var $slider = $wrapper.find('> ul');
		var $items = $slider.find('> li');
		var $single = $items.filter(':first');
		var $lists = jQuery(".slides-nav ul",this);
		
		var singleWidth = $single.outerWidth(); 
		var visible = Math.ceil($wrapper.innerWidth() / singleWidth);
		var currentPage = 1;
		var pages = Math.ceil($items.length / visible);
        var TimerId = null;
        
        $slider.css('width',singleWidth * ($items.length + 2) + "px");
        
        if (($items.length % visible) != 0) {
            $slider.append(repeat('<li class="empty" />', visible - ($items.length % visible)));
            $items = $slider.find('> li');
        }

        $items.filter(':first').before($items.slice(- visible).clone().addClass('cloned'));
        $items.filter(':last').after($items.slice(0, visible).clone().addClass('cloned'));
        $items = $slider.find('> li'); // reselect
        
        $wrapper.scrollLeft(singleWidth * visible);
        
        function setTimerSlide(){
            clearTimerSlide();
            TimerId = setTimeout(function(){timerSlide();},5000);
        }
        function timerSlide(){
            TimerId = null;
            gotoPage(currentPage + 1);
            setTimerSlide();
        }
        function clearTimerSlide(){
            if(TimerId != null){
                clearTimeout(TimerId);
                TimerId = null;
            }
        }
        function gotoPage(page) {
            var dir = page < currentPage ? -1 : 1;
            n = Math.abs(currentPage - page);
            left = singleWidth * dir * visible * n;
            
            $wrapper.filter(':not(:animated)').animate({
                scrollLeft : '+=' + left
            }, 500, function () {
                if (page == 0) {
                    $wrapper.scrollLeft(singleWidth * visible * pages);
                    page = pages;
                } else if (page > pages) {
                    $wrapper.scrollLeft(singleWidth * visible);
                    page = 1;
                }
                setCurrentPage(page);
            });                
            
            return false;
        }
        function setCurrentPage(page){
            currentPage = page;
            var num = 1;
            jQuery('li',$lists).each(function(){
                if(num == currentPage){
                    jQuery('img',this).attr('src','img/index/ko1.png');
                }else{
                    jQuery('img',this).attr('src','img/index/ko2.png');
                }
                num ++;
            });
        }
        
//        $wrapper.after('<a class="arrow back">&lt;</a><a class="arrow forward">&gt;</a>');
        
        //jQuery('a.back', this).click(function () {
        jQuery('a#back').click(function () {
            setTimerSlide();
            return gotoPage(currentPage - 1);                
        });
        
        //jQuery('a.forward', this).click(function () {
        jQuery('a#forward').click(function () {
            setTimerSlide();
            return gotoPage(currentPage + 1);
        });
        
        // create a public interface to move to a specific page
        jQuery(this).bind('goto', function (event, page) {
            gotoPage(page);
        });

        for(i=1;i<pages+1;i++){
            $lists.append('<li><img src="img/index/ko2.png" alt="" /></li>');
            $lists.find("#inf_page"+i).click(function(i){
                gotoPage(parseInt(jQuery('img',this).attr('alt')));
            });
        }
        setCurrentPage(currentPage);
        if(pages > 1){
            setTimerSlide();
        }
    });
};
jQuery(document).ready(function () {
	jQuery('#slideshow').infiniteCarousel();
});