// JavaScript Document

// JavaScript Document

$(document).ready(function(){
  var currentPosition20 = 0;
  var slideWidth20 = 706;
  var slides20 = $('.slide20');
  var numberOfSlides20 = slides20.length;

  // Remove scrollbar in JS
  $('.slidesContainer20').css('overflow', 'hidden');

  // Wrap all .slides with #slideInner div
  slides20
  .wrapAll('<div class="slideInner20"></div>')
  // Float left to display horizontally, readjust .slides width
  .css({
    'float' : 'left',
    'width' : slideWidth20
  });

  // Set #slideInner width equal to total width of all slides
  $('.slideInner20').css('width', slideWidth20 * numberOfSlides20);

  // Insert left and right arrow controls in the DOM
  $('.slideshow20')
    .prepend('<span class="control20" id="leftControl20">Move left</span>')
    .append('<span class="control20" id="rightControl20">Move right</span>');

  // Hide left arrow control on first load
  manageControls20(currentPosition20);

  // Create event listeners for .controls clicks
  $('.control20')
    .bind('click', function(){
    // Determine new position
      currentPosition20 = ($(this).attr('id')=='rightControl20')
    ? currentPosition20+1 : currentPosition20-1;

      // Hide / show controls
      manageControls20(currentPosition20);
      // Move slideInner using margin-left
      $('.slideInner20').animate({
        'marginLeft' : slideWidth20*(-currentPosition20)
      });
    });

  // manageControls: Hides and shows controls depending on currentPosition
  function manageControls20(position20){
    // Hide left arrow if position is first slide
    if(position20==0){ $('#leftControl20').hide() }
    else{ $('#leftControl20').show() }
    // Hide right arrow if position is last slide
    if(position20==numberOfSlides20-1){ $('#rightControl20').hide() }
    else{ $('#rightControl20').show() }
    }
  });