document.oncontextmenu = function() {return false}
if(document.layers) {
  window.captureEvents(Event.MOUSEDOWN); 
  window.onmousedown = function(e) { 
    if (e.target == document) return false; 
  } 
} 
else { 
//alert(navigator.appName + navigator.appVersion); 

  //document.onmousedown = function() {return false} 
}