function DX(e) 
{
	var bret
	if (navigator.appName == 'Netscape' && (e.which == 3 || e.which == 2))
		bret = false;
	else
	{
	  bret = true;
	  if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2 || event.button == 3)) 
	  {
		event.cancelBubble = true;
		event.returnValue = false;	  
		//alert("Operazione non consentita.");
		bret = false;
	  }
	} 
} 
document.onmousedown = DX;
if (document.layers) 
{
	window.captureEvents(Event.MOUSEDOWN);
	window.onmousedown=DX;
}