// JavaScript Document

	var img_bool = true;
	var img_timer;
	var img_num = img_array.length - 1;
	var img_cur = 0;
	var img_not_appeared = true;
	
	function swap(id){
		if (img_bool) {
			img_bool = false;
			$('#sfondo_img').css('z-index', '-2');
			$('#sfondo_img2').css('z-index', '-1');
			var img = new Image();
			$(img).load(function () {
				$('#sfondo_img2').attr('src', img_array[id]);
				background_resize2(id);
				$('#sfondo_img2').fadeIn(function () {
					$('#sfondo_img').hide();
				});
			}).attr('src',img_array[id]);
		} else {
			img_bool = true;
			$('#sfondo_img').css('z-index', '-1');
			$('#sfondo_img2').css('z-index', '-2');
			var img = new Image();
			$(img).load(function () {
				$('#sfondo_img').attr('src', img_array[id]);
				background_resize2(id);
				$('#sfondo_img').fadeIn(function () {
					$('#sfondo_img2').hide();
				});
			}).attr('src',img_array[id]);
		}
	}

	function background_change() {
		if (img_cur < img_num) {
			img_cur++;
		} else {
			img_cur = 0;
		}
		swap(img_cur);
		$('#debug').append(img_cur + ' ' );
	}
	function background_size_set(w) {
		$('#sfondo_img').width(w);
		$('#sfondo_img2').width(w);
		if (img_not_appeared) {
			$('#sfondo_img').show();
			img_not_appeared = false;
			if (img_num > 0) img_timer = setInterval(background_change, 5000);
		}
	}
	function background_size_set2(w) {
		$('#sfondo_img2').width(w);
	}
	function background_resize2(id) {
		var img_fact = img_width[id] / img_height[id];
		var window_fact = $(window).width() / $(window).height();
		if (img_fact >= window_fact) {
			background_size_set2( $(window).height() * img_fact);
		} else {
			background_size_set2( $(window).width());
		}
	}
	function background_resize() {
		var img_fact = img_width[img_cur] / img_height[img_cur];
		
		var window_fact = $(window).width() / $(window).height();
		$('#debug').append($(window).width());
		if (img_fact >= window_fact) {
			background_size_set( $(window).height() * img_fact);
		} else {
			background_size_set( $(window).width());
		}
	}
	$(document).ready(function() {
		$('#sfondo_img').attr('src', img_array[img_cur]);
		$(window).resize(function() {
			background_resize();
		});
		background_resize();
	});