//==========================
//         FUNZIONI
//==========================

function getBrowser() {
  var browser = "";
  if (navigator.appName == "Netscape")
    browser = "ns";
  else if (navigator.appName == "Microsoft Internet Explorer")
    browser = "ie";
  return browser;
}

function getXOrigine() {
  var xOrigine = 0;
  if (screen.width > 800)
    xOrigine = (screen.width-800)/2;
  return xOrigine;
}

function posizionaContainer() {
  switch (getBrowser()) {
    case "ie" :
      document.all["Layer0"].style.left=getXOrigine();
      break;
    case "ns" :
      document.layers["Layer0"].left=getXOrigine();
      break;
  }
}

function showOrHideLayers(azione) {
  switch (azione) {
    case "show" :
      switch (getBrowser()) {
        case "ie" :
          for (var i=0; i < document.all.length; i++) {
            if (document.all["Layer"+i])
              document.all["Layer"+i].style.visibility="visible";
          }
          break;
        case "ns" :
          document.layers['Layer0'].visibility="show";
          for (var i=1; i <= document.layers['Layer0'].document.layers.length; i++) {
            document.layers['Layer0'].document.layers["Layer"+i].visibility="show";
          }
          break;
      }
      break;
    case "hide" :
      switch (getBrowser()) {
        case "ie" :
          for (var i=0; i < document.all.length; i++) {
            if (document.all["Layer"+i])
              document.all["Layer"+i].style.visibility="hidden";
          }
          break;
        case "ns" :
          for (var i=0; i < document.layers.length; i++) {
            document.layers["Layer"+i].visibility="hide";
          }
          break;
      }
      break;
  }
}