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

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