$(document).ready(function(){

  var currentPosition = 0;
  var slideWidth = 270;
  var slideHeight = 669;
  var slides = $('ul.artSlide li');

  var sHeight = $('ul.artSlide').height();

  var numberOfSlides = Math.ceil(sHeight / slideHeight);
 
  // Remove scrollbar in JS
  $('#slidesContainer .slide').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' : 'none',
      'width' : slideWidth,
    });

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

  // Insert controls in the DOM
  $('#slideshow')
    .prepend('<span class="control" id="leftControl">W lewo</span>')
    .append('<span class="control" id="rightControl">W prawo</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({
      'marginTop' : (slideHeight)*(-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() }
  }	


});