var currentImage = 0;
	
	function changeImage(tabfoto)
	{
		var tabfoto;
		
		var preloadimg = new Image();
		preloadimg.src = "images/header-photo-"+tabfoto[currentImage]+".jpg";
				
		$(preloadimg).load(function() {
			$(".headerphoto").fadeOut("slow", function(){
				$(this).css("background-image", "url(images/header-photo-"+tabfoto[currentImage]+".jpg)");
				$(this).fadeIn("slow");
			});
		});
					
		currentImage++;
		if (currentImage == tabfoto.length) currentImage = 0;
	}
	
	function shuffle(a)
	{
	   var j = 0;
	   var valI = '';
	   var valJ = valI;
	   var l = a.length - 1;
	   while(l > -1)
	   {
			j = Math.floor(Math.random() * l);
			valI = a[l];
			valJ = a[j];
			a[l] = valJ;
			a[j] = valI;
			l = l - 1;
		}
		return a;
	 }