if (window != top) top.location.href = location.href;
document.oncontextmenu = function(){return false}
if(document.layers) {
  window.captureEvents(Event.MOUSEDOWN);
  window.onmousedown = function(e){
    if(e.target==document)return false;
  }
}
else {
  document.onmousedown = function(){return false}
}