$(document).ready(function(){
  var currentPosition = 0;
  var slideWidth = 960;
  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" id="leftControl">Clicking moves left</span>')
    .append('<span class="control" id="rightControl">Clicking moves right</span>');

  // Create event listeners for .controls clicks
  $('.control')
    .bind('click', function(){
    // Determine new position
	clearInterval(timer);

	currentPosition = ($(this).attr('id')=='rightControl') ? currentPosition+1 : currentPosition-1;
    
	// check for start/end
    rollover(currentPosition);
	
    // Move slideInner using margin-left
    $('#slideInner').animate({
      'marginLeft' : slideWidth*(-currentPosition)
    });
  });

  // rollover if at start/end
  function rollover(position){
    // Hide left arrow if position is first slide
	if(position==-1){ currentPosition = numberOfSlides-1 }
	// Hide right arrow if position is last slide
    if(position==numberOfSlides){ currentPosition = 0 }
  }
  

var timer = setInterval(update,7000);

function update() {
  currentPosition = currentPosition+1;
  rollover(currentPosition);
  $('#slideInner').animate({
      'marginLeft' : slideWidth*(-currentPosition)
  });
}
 
  
});