submenu = function(t) {
if (t=='home') {
  //document.getElementById('n1_home').style.display="block";
  document.getElementById('n1_firm').style.display="none";
  document.getElementById('n1_life').style.display="none";
  document.getElementById('n1_it').style.display="none";
  document.getElementById('n0_home').className="on";
  document.getElementById('n0_firm').className="";
  document.getElementById('n0_life').className="";
  document.getElementById('n0_it').className="";
}
else if (t=='firm') {
  //document.getElementById('n1_home').style.display="none";
  document.getElementById('n1_firm').style.display="block";
  document.getElementById('n1_life').style.display="none";
  document.getElementById('n1_it').style.display="none";
  document.getElementById('n0_home').className="";
  document.getElementById('n0_firm').className="on";
  document.getElementById('n0_life').className="";
  document.getElementById('n0_it').className="";
}
else if (t=='life') {
  //document.getElementById('n1_home').style.display="none";
  document.getElementById('n1_firm').style.display="none";
  document.getElementById('n1_life').style.display="block";
  document.getElementById('n1_it').style.display="none";
  document.getElementById('n0_home').className="";
  document.getElementById('n0_firm').className="";
  document.getElementById('n0_life').className="on";
  document.getElementById('n0_it').className="";
}
else if (t=='it') {
  //document.getElementById('n1_home').style.display="none";
  document.getElementById('n1_firm').style.display="none";
  document.getElementById('n1_life').style.display="none";
  document.getElementById('n1_it').style.display="block";
  document.getElementById('n0_home').className="";
  document.getElementById('n0_firm').className="";
  document.getElementById('n0_life').className="";
  document.getElementById('n0_it').className="on";
}
}