function hideDiv(what) { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('hideshow_'+what).style.visibility = 'hidden'; 
} 
else { 
if (document.layers) { // Netscape 4 
var extra = "hideshow_" + what;
document.extra.visibility = 'hidden'; 
} 
else { // IE 4 
var extra = "hideshow_" + what;
document.all.extra.style.visibility = 'hidden'; 
} 
} 
}

function showDiv(what) { 
if (document.getElementById) { // DOM3 = IE5, NS6 
document.getElementById('hideshow_'+what).style.visibility = 'visible'; 
} 
else { 
if (document.layers) { // Netscape 4
var extra = "hideshow_" + what;
document.extra.visibility = 'visible'; 
} 
else { // IE 4 
var extra = "hideshow_" + what;
document.all.extra.style.visibility = 'visible'; 
} 
} 
}