$(document).ready(function(){
  
  if (screen.width==1024){
      $("#PageGalleryslideshow").css("width",650);
      $("#PageGallerySlidesContainer").css("width",550);
  } 
  if (screen.width==800){
      $("#PageGalleryslideshow").css("width",400);
      $("#PageGallerySlidesContainer").css("width",350); 
   }
  
  var currentPosition = 0;
  var slideWidth = 680;
  var slides = $('.PageGalleryslide');
  var numberOfSlides = slides.length;

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

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

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

  // Insert controls in the DOM
 $('#PageGalleryslideshow')
    .prepend('<span class="PageGallerycontrol" id="PageGalleryleftControl">Clicking moves left</span>')
    .append('<span class="PageGallerycontrol" id="PageGalleryrightControl">Clicking moves right</span>');

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

  // Create event listeners for .controls clicks
  $('.PageGallerycontrol')
    .bind('click', function(){
    // Determine new position
  currentPosition = ($(this).attr('id')=='PageGalleryrightControl') ? currentPosition+1 : currentPosition-1;
    
  // Hide / show controls
    manageControls(currentPosition);
    // Move slideInner using margin-left
    $('#PageGallerySlideInner').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){ $('#PageGalleryleftControl').hide() } else{ $('#PageGalleryleftControl').show() }
  // Hide right arrow if position is last slide
    if(position==numberOfSlides-1){ $('#PageGalleryrightControl').hide() } else{ $('#PageGalleryrightControl').show() }
  }  
      
});