var browser = navigator.appName;
var b_versione = navigator.appVersion;
var versione = parseFloat(b_versione);
if (browser == "Netscape" || browser == "Opera")
  br = "ns";
else if (versione == 5)
	br = "ns";
else
  br = "ie";
var limite = 7;
var pos = 0;
var counter = 0;
var counter_fade = 0;
var vel_fade = 1;
var max_fade = 99;
var min_fade = 1;
var lim_min = min_fade+vel_fade
var lim_max = max_fade-vel_fade

var img = new Array();
img[0] = new Array();
img[0][1] = new Image();
img[0][1].src = "./img/common/home_01.jpg";
img[0][2] = new Image();
img[0][2].src = "./img/common/home_02.jpg";
img[0][3] = new Image();
img[0][3].src = "./img/common/home_03.jpg";
img[0][4] = new Image();
img[0][4].src = "./img/common/home_04.jpg";

var vis = 1;

function attiva_slideshow() {
  setTimeout('parti()',5000);
}
function parti() {
  tempo = setInterval('spegni_foto()',15);
}
function spegni_foto() {
  counter_fade = counter_fade+vel_fade;
	pos = 99-counter_fade;
  with (document.getElementById('foto_home').style) {
		if (pos <= lim_min) {
			if (br == "ns") opacity = ".0";
			else filter = "alpha(opacity=0)";
			cambia_foto();
		} else {
			if (br == "ns") {
			 if (pos >= 10) opacity = "."+pos;
			 else opacity = ".0"+pos;
			} else filter = "alpha(opacity="+pos+")";
		}
	}
}
function cambia_foto(p) {
	counter_fade = 0;
	clearInterval(tempo);
	vis = vis+1;
	if (vis == 5 ) vis = 1;
	with (document) {
	  images["slide"].src = img[0][vis].src;
 		tempo = setInterval('accendi_foto()',15);
	}
}
function accendi_foto() {
  counter_fade = counter_fade+vel_fade;
	pos = 10+counter_fade;
  with (document.getElementById('foto_home').style) {
		if (pos >= lim_max) {
			if (br == "ns") opacity = ".99";
			else filter = "alpha(opacity=99)";
			ferma();
		} else {
			if (br == "ns") {
			 if (pos >= 10) opacity = "."+pos;
			 else opacity = ".0"+pos;
			} else filter = "alpha(opacity="+pos+")";
		}
	}
}
function ferma() {
	clearInterval(tempo);
	counter_fade = 0;
	setTimeout('parti()',8000);
}