function hidediv4() {
if (document.getElementById) { // DOM3 = IE5, NS6
document.getElementById('hideshow4').style.visibility = 'hidden';
}
else {
if (document.layers) { // Netscape 4
document.hideshow4.visibility = 'hidden';
}
else { // IE 4
document.all.hideshow4.style.visibility = 'hidden';
}
}
}

function showdiv4() {
if (document.getElementById) { // DOM3 = IE5, NS6
document.getElementById('hideshow4').style.visibility = 'visible';
}
else {
if (document.layers) { // Netscape 4
document.hideshow4.visibility = 'visible';
}
else { // IE 4
document.all.hideshow4.style.visibility = 'visible';
}
}
}