function clickIE4() {
  if (event.button == 2){
    alert(message);
    return false;
  }
}

function clickNS4(e) {
  if ( document.layers || document.getElementById && !document.all ) {
    if (e.which == 2 || e.which == 3) {
      alert(message);
      return false;
    }
  }
}

function disableRightClicks() {
  if (document.layers) {
    document.captureEvents(Event.MOUSEDOWN);
    document.onmousedown = clickNS4;
  }
  else if (document.all && !document.getElementById)
    document.onmousedown = clickIE4;

  document.oncontextmenu = 
        new Function( "alert('Function disabled'); return false;" );
}