$(document).ready(function(){
  var currentPosition   = 0;
  var slideWidth        = 1000;
  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 controls in the DOM
  $('#slideshow')
    .prepend('<span class="control png" id="leftControl">Clicking moves left</span>')
    .append('<span class="control png" id="rightControl">Clicking moves 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();
    }
  }	
});