var resizeBg = function(){ 
  var h = self.innerHeight || document.documentElement.clientHeight || document.body.clientHeight; 
  var w = self.innerWidth || document.documentElement.clientWidth || document.body.clientWidth; 
  var elem = document.getElementById('bg_img'); 
  if( w > h ) { 
    elem.width = w; 
    elem.height = w; 
  } else { 
    elem.height = h; 
    elem.width = h; 
  } 
}

$(document).ready(function(){
  resizeBg();
  
  $(window).resize(function(){
    resizeBg();
  });
  
});


// Slideshow
$(document).ready(function(){
  var currentPosition = 0;
  var slideWidth = 900;
  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 left and right arrow controls in the DOM
  $('#slideshow')
    .prepend('<span class="control" id="leftControl">Move left</span>')
    .append('<span class="control" id="rightControl">Move 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() }
    }
  });


var currentPosition = 0;
var slideWidth = 560;
var slides = $('.slide');
var numberOfSlides = slides.length;

$('#slidesContainer').css('overflow', 'hidden');

slides
  .wrapAll('<div  id="slideInner"></div>')

$('#slideInner').css('width', slideWidth * numberOfSlides);

slides
  .css('overflow', 'hidden')
  .wrapAll('<div  id="slideInner"></div>')

$('#slideshow')
  .prepend('<span class="control" id="leftControl">Moves left</span>')
  .append('<span class="control" id="rightControl">Moves right</span>');

function  manageControls(position){
  // position==0 is first slide
  if(position==0)  { $('#leftControl').hide(); }
  else { $('#leftControl').show(); }
    // numberOfSlides-1 is last slides
  if(position==numberOfSlides-1) {  $('#rightControl').hide(); }
  else { $('#rightControl').show(); }
}      

manageControls(currentPosition);

$('.control').bind('click',  function(){
  // do something when user clicks
});

currentPosition = ($(this).attr('id')=='rightControl')
                  ?  currentPosition+1 : currentPosition-1;

manageControls(currentPosition);

$('#slideInner').animate({
  'marginLeft' : slideWidth*(-currentPosition)
});