$(document).ready(function() {
    var currentPosition = 0;
    var slideWidth = 820;
    var slides = $('.slide');
    var numberOfSlides = slides.length;

    // Remove scrollbar in JS
    $('#slidesContainer').css('overflow', 'hidden');

    // Wrap all .slides with #slideInner div
    slides
  .wrapAll('<div id="slideInner"></div>')
    // Float left to display horizontally, readjust .slides width
  .css({
      'float': 'left',
      'width': slideWidth
  });

    // Set #slideInner width equal to total width of all slides
    $('#slideInner').css('width', slideWidth * numberOfSlides);

    // Insert left and right arrow controls in the DOM
    $('#slideshow')
    .prepend('<div class="control" id="leftControl">Move left</span>')
    .append('<div class="control" id="rightControl" >Move right</span>');

    // Hide left arrow control on first load
    manageControls(currentPosition);

    // Create event listeners for .controls clicks
    $('.control')
    .bind('click', function() {
        // Determine new position
        currentPosition = ($(this).attr('id') == 'rightControl')
    ? currentPosition + 1 : currentPosition - 1;

        // Hide / show controls
        manageControls(currentPosition);
        // Move slideInner using margin-left
        $('#slideInner').animate({
            'marginLeft': slideWidth * (-currentPosition)
        });
    });


    // manageControls: Hides and shows controls depending on currentPosition
    function manageControls(position) {
        // Hide left arrow if position is first slide
        if (position == 0) { $('#leftControl').hide() }
        else { $('#leftControl').show() }
        // Hide right arrow if position is last slide
        if (position == numberOfSlides - 1) { $('#rightControl').hide() }
        else { $('#rightControl').show() }
    }
});