// JavaScript Document
function hideNav(divname) { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById(divname).style.visibility = 'hidden'; 
} 
else { 
if (document.layers) { // Netscape 4 
document.hideshow.visibility = 'hidden'; 
} 
else { // IE 4 
document.all.hideshow.style.visibility = 'hidden'; 
} 
} 
} 

function showNav(divname) { 
hideallnav();
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById(divname).style.visibility = 'visible'; 
} 
else { 
if (document.layers) { // Netscape 4 
document.hideshow.visibility = 'visible'; 
} 
else { // IE 4 
document.all.hideshow.style.visibility = 'visible'; 
} 
} 
} 

function hideallnav() {
hideNav('nav_one');
hideNav('nav_two');
hideNav('nav_three');
hideNav('nav_four');
hideNav('nav_five');
}