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