function hidediv() { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('email').style.visibility = 'hidden'; 
} 
else { 
if (document.layers) { // Netscape 4 
document.email.visibility = 'hidden'; 
} 
else { // IE 4 
document.all.email.style.visibility = 'hidden'; 
} 
} 
}

function showdiv() { 

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