(function(d, s, id) {
		  var js, fjs = d.getElementsByTagName(s)[0];
		  if (d.getElementById(id)) {return;}
		  js = d.createElement(s); js.id = id;
		  js.src = "//connect.facebook.net/en_GB/all.js#xfbml=1";
		  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));

		
			
// On window load. This waits until images have loaded which is essential
	$(window).load(function(){
				
				// Fade in images so there isn't a color "pop" document load and then on window load
				$(".main-car-nav img").fadeIn(500);
				
				// clone image
				$('.main-car-nav img').each(function(){
					var el = $(this);
					el.css({"position":"absolute"}).wrap("<div class='img_wrapper' style='display: inline-block'>").clone().addClass('img_grayscale').css({"position":"absolute","z-index":"998","opacity":"0"}).insertBefore(el).queue(function(){
						var el = $(this);
						el.parent().css({"width":this.width,"height":this.height});
						el.dequeue();
					});
					this.src = grayscale(this.src);
				});
				
				// Fade image 
				$('.main-car-nav img').mouseover(function(){
					$(this).parent().find('img:first').stop().animate({opacity:1}, 1000);
				})
				$('.img_grayscale').mouseout(function(){
					$(this).stop().animate({opacity:0}, 1000);
				});		
			});
			
			// Grayscale w canvas method
			function grayscale(src){
				var canvas = document.createElement('canvas');
				var ctx = canvas.getContext('2d');
				var imgObj = new Image();
				imgObj.src = src;
				canvas.width = imgObj.width;
				canvas.height = imgObj.height; 
				ctx.drawImage(imgObj, 0, 0); 
				var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
				for(var y = 0; y < imgPixels.height; y++){
					for(var x = 0; x < imgPixels.width; x++){
						var i = (y * 4) * imgPixels.width + x * 4;
						var avg = (imgPixels.data[i] + imgPixels.data[i + 1] + imgPixels.data[i + 2]) / 3;
						imgPixels.data[i] = avg; 
						imgPixels.data[i + 1] = avg; 
						imgPixels.data[i + 2] = avg;
					}
				}
				ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
				return canvas.toDataURL();
		}