function on() {
if (document.all) {
document.all.quantum.style.visibility='visible';
}
else if (document.layers) {
document.layers.quantum.visibility='show';
}
else if (document.getElementById) {
document.getElementById('quantum').style.visibility='visible';
}
}

function off() {
if (document.all) {
document.all.quantum.style.visibility='hidden';
}
else if (document.layers) {
document.layers.quantum.visibility='show';
}
else if (document.getElementById) {
document.getElementById('quantum').style.visibility='hidden';
}
}