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";

// Variabili per effetto fade
var pos = 0;
var counter_fade = 0;
var vel_fade = 3;
var max_fade = 99;
var lim_max = max_fade-vel_fade;

// Variabili per effetto clip
var pos_clip = 0;
var counter_clip = 0;
var vel_clip = 1;
var max_clip = 0;

function mostra(c) {
  max_clip = document.getElementById('intro_ok').clientHeight;
	if (c == "fade")
    tempo = setInterval('accendi()',50);
  if (c == "clip")
    tempo = setInterval('scorri()',1);
}

function accendi() {
  counter_fade = counter_fade+vel_fade;
	pos = 0+counter_fade;
  with (document) {
		if (pos >= lim_max) {
		  if (br == "ns")
			  getElementById('logo').style.opacity = ".99";
			else
			  getElementById('logo').style.filter = "alpha(opacity=99)";
			ferma_fade('clip');
		} else {
			if (br == "ns") {
			  if (pos >= 10)
			    getElementById('logo').style.opacity = "."+pos;
			  else
			    getElementById('logo').style.opacity = ".0"+pos;
    	} else
			  getElementById('logo').style.filter = "alpha(opacity="+pos+")";
		}
	}
}
function scorri() {
  counter_clip = counter_clip+vel_clip;
	pos_clip = 0+counter_clip;
	if (pos_clip <= max_clip) {
    document.getElementById('intro_ok').style.clip = "rect( 0px 213px "+pos_clip+"px 0px )";
	} else
	  ferma_fade();
}
function ferma_fade(a) {
	clearInterval(tempo);
	if (a == "clip")
		mostra (a);
}
function cambia_lingua(lin) {
	with (document) {
    getElementById('testo_it').style.display = "none";
    getElementById('testo_en').style.display = "none";
    getElementById('testo_'+lin).style.display = "block";
	}
}