var cislo;
var celkem;
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.filter = "alpha(opacity:" + opacity + ")";
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
}
function hideAll() {
  var i=1;
  while (document.getElementById("n"+i) != null) {  
    document.getElementById("n"+i).style.display = 'none';
    changeOpac(0, "n"+i);
    i++;
  }
  celkem=i-1;
  cislo=1;
  show();
}
function show() {
  document.getElementById("n"+cislo).style.display = 'block';
  fadeIn(0);
}
function fadeIn(i) {
  if (i<100) {
    changeOpac(i, "n"+cislo)
    setTimeout('fadeIn('+(i+2)+')', 5);
  } else {
    setTimeout('fadeOut(100)', 3000);
  }
}
function fadeOut(i) {
  if (i>0) {
    changeOpac(i, "n"+cislo)
    setTimeout('fadeOut('+(i-2)+')', 5);
  } else {
    hide();
  }
}
function hide() {
  document.getElementById("n"+cislo).style.display = 'none';
  if (cislo!=celkem) {
    cislo++;
  } else {
    cislo = 1;
  }
  show();
}
hideAll();