function right(e) { 
if (navigator.appName == 'Netscape' &&  
(e.which == 3 || e.which == 2 )) 
return false; 
else if (navigator.appName == 'Microsoft Internet Explorer' &&  
(event.button == 2 || event.button == 3)) { 
alert("I-m-p-o-s-s-i-b-l-e, hélas ! "); 
return false;} 
return true;} 
document.onmousedown=right; 
document.onmouseup=right; 
if (document.layers) window.captureEvents(Event.MOUSEDOWN); 
if (document.layers) window.captureEvents(Event.MOUSEUP); 
window.onmousedown=right; 
window.onmouseup=right;