function selection(e) {
  return false;
}

function clic(){
  return true;
}

document.onselectstart = new Function("return false");

if (window.sidebar) {
  document.onmousedown = selection;
  document.onclick = clic;
}

function right(e) {

    var msg = "Désolé, le bouton de droit est désactivé.";
    if (navigator.appName == 'Netscape' && e.which == 3)

    {
        alert(msg);
    }
    else if (navigator.appName == 'Microsoft Internet Explorer' && event.button == 2)

    {
        alert(msg);

    }
    return true;
}

document.onmousedown = right;