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
     }
  }