$(document).ready(function () {

    //options( 1 - ON , 0 - OFF)  
    var auto_slide = 1;
    var hover_pause = 1;
    var key_slide = 1;

    //speed of auto slide(  
    var auto_slide_seconds = 5000;
    /* IMPORTANT: i know the variable is called ...seconds but it's 
    in milliseconds ( multiplied with 1000) '*/

    /*move the last list item before the first item. The purpose of this is 
    if the user clicks to slide left he will be able to see the last item.*/
    $('#carousel_ul li:first').before($('#carousel_ul li:last'));

    //check if auto sliding is enabled  
    if (auto_slide == 1) {
        /*set the interval (loop) to call function slide with option 'right' 
        and set the interval time to the variable we declared previously */
        var timer = setInterval('slide("right")', auto_slide_seconds);

        /*and change the value of our hidden field that hold info about 
        the interval, setting it to the number of milliseconds we declared previously*/
        $('#hidden_auto_slide_seconds').val(auto_slide_seconds);
    }

    //check if hover pause is enabled  
    if (hover_pause == 1) {
        //when hovered over the list  
        $('#carousel_ul').hover(function () {
            //stop the interval  
            clearInterval(timer)
        }, function () {
            //and when mouseout start it again  
            timer = setInterval('slide("right")', auto_slide_seconds);
        });

    }

    //check if key sliding is enabled  
    if (key_slide == 1) {

        //binding keypress function  
        $(document).bind('keypress', function (e) {
            //keyCode for left arrow is 37 and for right it's 39 '  
            if (e.keyCode == 37) {
                //initialize the slide to left function  
                slide('left');
            } else if (e.keyCode == 39) {
                //initialize the slide to right function  
                slide('right');
            }
        });

    }

});

//FUNCTIONS BELLOW  

//slide function  
function slide(where) {

    //get the item width  
    var item_width = $('#carousel_ul li').outerWidth() + 10;

    /* using a if statement and the where variable check 
    we will check where the user wants to slide (left or right)*/
    if (where == 'left') {
        //...calculating the new left indent of the unordered list (ul) for left sliding  
        var left_indent = parseInt($('#carousel_ul').css('left')) + item_width;
    } else {
        //...calculating the new left indent of the unordered list (ul) for right sliding  
        var left_indent = parseInt($('#carousel_ul').css('left')) - item_width;

    }

    //make the sliding effect using jQuery's animate function... '  
    $('#carousel_ul:not(:animated)').animate({ 'left': left_indent }, 500, function () {

        /* when the animation finishes use the if statement again, and make an ilussion 
        of infinity by changing place of last or first item*/
        if (where == 'left') {
            //...and if it slided to left we put the last item before the first item  
            $('#carousel_ul li:first').before($('#carousel_ul li:last'));
        } else {
            //...and if it slided to right we put the first item after the last item  
            $('#carousel_ul li:last').after($('#carousel_ul li:first'));
        }

        //...and then just get back the default left indent  
        $('#carousel_ul').css({ 'left': '-538px' });
    });

}