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if (window.Event)
  document.captureEvents(Event.MOUSEUP);
function nocontextmenu() {
  event.cancelBubble = true, event.returnValue = false;
  return false;
}
function norightclick(e) {
  if (window.Event) {
    if (e.which == 2 || e.which == 3) return false;
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  else if (event.button == 2 || event.button == 3) {
    event.cancelBubble = true, event.returnValue = false;
    return false;
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}
if (document.layers)
  document.captureEvents(Event.MOUSEDOWN);
document.oncontextmenu = nocontextmenu;//osw
document.onmousedown = norightclick;
document.onmouseup = norightclick;
//--></script>