function chiudi(e) {
	return false;
}
function chiave() {
	if((navigator.appName == 'Microsoft Internet Explorer' && event.ctrlKey)) { 
		if((event.keyCode == 8) ||((event.ctrlKey) && (event.keyCode == 78)) || ((event.ctrlKey) &&(event.keyCode == 110)))

			return false;
						
	}
}
document.oncontextmenu=chiudi;
if (document.layers) window.captureEvents(Event.contextmenu);
window.oncontextmenu=chiudi;
document.onkeydown=chiave