w3c = (document.getElementById) ? true : false;

nn4 = (document.layers) ? true : false;

ie  = (document.all) ? true : false;

mac = (navigator.appVersion.indexOf("Mac") != -1);

ie4 = ie && !w3c;

nn4win = nn4 && !mac;

nn4mac = nn4 && mac;

ie4mac = ie4 && mac;

ie5 = ie && w3c;


function hideLayer(whichLayer) {

if (w3c) {
document.getElementById(whichLayer).style.visibility = "hidden";
}
else if (ie) {
document.all[whichlayer].style.visibility = "hidden";
}
else if (nn4) {
document.layers[whichLayer].visibility = "hidden";
}

}


function showLayer(whichLayer) {

if (w3c) {
document.getElementById(whichLayer).style.visibility = "visible";
}
else if (ie) {
document.all[whichlayer].style.visibility = "visible";
}
else if (nn4) {
document.layers[whichLayer].visibility = "visible";
}

}

function reload() {
document.location = document.location;
}