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

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