function mdown(e) {
if (navigator.appName == "Microsoft Internet Explorer") {
if (event.button == 2) {
alert("Right-clicking cannot be used.");
return(false);
}
} else if (navigator.appName == "Netscape") {
if (e.which == 3) {
alert("Right-clicking cannot be used.");
return(false);
}
}
}
if (document.all) {
document.onmousedown = mdown;
}
if (document.layers) {
window.onmousedown = mdown;
window.captureEvents(Event.MOUSEDOWN);
}