ns4 = (document.layers) ? true:false 
ie4 = (document.all) ? true:false 
ng5 = (document.getElementById) ? true:false

function hideMenu() {
if (ng5) document.getElementById('menu1').style.visibility = "hidden"
else if (ns4) document.menu1.visibility = "hide"
else if (ie4) menu1.style.visibility ="hidden"

if (ng5) document.getElementById('menu2').style.visibility = "hidden"
else if (ns4) document.menu2.visibility = "hide"
else if (ie4) menu2.style.visibility ="hidden"

if (ng5) document.getElementById('menu3').style.visibility = "hidden"
else if (ns4) document.menu3.visibility = "hide"
else if (ie4) menu3.style.visibility ="hidden"

if (ng5) document.getElementById('menu4').style.visibility = "hidden"
else if (ns4) document.menu4.visibility = "hide"
else if (ie4) menu4.style.visibility ="hidden"

if (ng5) document.getElementById('menu5').style.visibility = "hidden"
else if (ns4) document.menu5.visibility = "hide"
else if (ie4) menu5.style.visibility ="hidden"

if (ng5) document.getElementById('menu6').style.visibility = "hidden"
else if (ns4) document.menu6.visibility = "hide"
else if (ie4) menu6.style.visibility ="hidden"

if (ng5) document.getElementById('menu7').style.visibility = "hidden"
else if (ns4) document.menu7.visibility = "hide"
else if (ie4) menu7.style.visibility ="hidden"

if (ng5) document.getElementById('menu8').style.visibility = "hidden"
else if (ns4) document.menu8.visibility = "hide"
else if (ie4) menu8.style.visibility ="hidden"
}

function showMenu(n) {
hideMenu();
if (ng5) document.getElementById('menu' + n).style.visibility = "visible";
else if (ns4) document.layers["menu" + n].visibility = "show";
else if (ie4) document.all["menu" + n].style.visibility = "visible";
}

function showAllMenu(n) {
if (ng5) document.getElementById('menu' + n).style.visibility = "visible";
else if (ns4) document.layers["menu" + n].visibility = "show";
else if (ie4) document.all["menu" + n].style.visibility = "visible";
}