function show1 () {
  if (document.getElementById)
    document.getElementById("subnav1").style.visibility = "visible";
	document.getElementById("subnav2").style.visibility = "hidden";
	document.getElementById("subnav3").style.visibility = "hidden";
	document.getElementById("subnav4").style.visibility = "hidden";
	document.getElementById("subnav5").style.visibility = "hidden";
	document.getElementById("subnav6").style.visibility = "hidden";
}

function hide1 () {
  if (document.getElementById)
    document.getElementById("subnav1").style.visibility = "hidden";
}

function show2 () {
  if (document.getElementById)
    document.getElementById("subnav2").style.visibility = "visible";
	document.getElementById("subnav1").style.visibility = "hidden";
	document.getElementById("subnav3").style.visibility = "hidden";
	document.getElementById("subnav4").style.visibility = "hidden";
	document.getElementById("subnav5").style.visibility = "hidden";
	document.getElementById("subnav6").style.visibility = "hidden";
}

function hide2 () {
  if (document.getElementById)
    document.getElementById("subnav2").style.visibility = "hidden";
}

function show3 () {
  if (document.getElementById)
    document.getElementById("subnav3").style.visibility = "visible";
	document.getElementById("subnav1").style.visibility = "hidden";
	document.getElementById("subnav2").style.visibility = "hidden";
	document.getElementById("subnav4").style.visibility = "hidden";
	document.getElementById("subnav5").style.visibility = "hidden";
	document.getElementById("subnav6").style.visibility = "hidden";
}

function hide3 () {
  if (document.getElementById)
    document.getElementById("subnav3").style.visibility = "hidden";
}
function show4 () {
  if (document.getElementById)
    document.getElementById("subnav4").style.visibility = "visible";
	document.getElementById("subnav1").style.visibility = "hidden";
	document.getElementById("subnav2").style.visibility = "hidden";
	document.getElementById("subnav3").style.visibility = "hidden";
	document.getElementById("subnav5").style.visibility = "hidden";
	document.getElementById("subnav6").style.visibility = "hidden";
}

function hide4 () {
  if (document.getElementById)
    document.getElementById("subnav4").style.visibility = "hidden";
}

function show5 () {
  if (document.getElementById)
    document.getElementById("subnav5").style.visibility = "visible";
	document.getElementById("subnav1").style.visibility = "hidden";
	document.getElementById("subnav2").style.visibility = "hidden";
	document.getElementById("subnav3").style.visibility = "hidden";
	document.getElementById("subnav4").style.visibility = "hidden";
	document.getElementById("subnav6").style.visibility = "hidden";
}

function hide5 () {
  if (document.getElementById)
    document.getElementById("subnav5").style.visibility = "hidden";
}

function show6 () {
  if (document.getElementById)
    document.getElementById("subnav6").style.visibility = "visible";
	document.getElementById("subnav1").style.visibility = "hidden";
	document.getElementById("subnav2").style.visibility = "hidden";
	document.getElementById("subnav3").style.visibility = "hidden";
	document.getElementById("subnav4").style.visibility = "hidden";
	document.getElementById("subnav5").style.visibility = "hidden";
}

function hide6 () {
  if (document.getElementById)
    document.getElementById("subnav6").style.visibility = "hidden";
}

function hide () {
  if (document.getElementById)
    document.getElementById("subnav1").style.visibility = "hidden";
	document.getElementById("subnav2").style.visibility = "hidden";
	document.getElementById("subnav3").style.visibility = "hidden";
	document.getElementById("subnav4").style.visibility = "hidden";
	document.getElementById("subnav5").style.visibility = "hidden";
	document.getElementById("subnav6").style.visibility = "hidden";
	
}