function killOpera() {
  var op = navigator.userAgent.indexOf('Opera') != -1;
  var nav = navigator.appName == "Netscape";;
  if (op) 
  {
    hideLayer1();
  }

  if (nav) 
  {
    setTimeout('hideLayer1()',10000);
  }
}

function hideLayer1() {
    document.getElementById('Layer1').style.display = 'none';
}