function right(e) {
  if (navigator.appName =='Netscape'&& (e.which ==3|| e.which ==2))
    return false;
  else if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2|| event.button ==3)) {
    alert("請尊重智慧財產權，謝謝。");
    return false;
  }
  return true;
}
document.onmousedown=right;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
window.onmousedown=right;