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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("Sorry, de rechtermuisknop is geblokkeerd!"); 
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; 
// End --> 


<!-- Begin
function blockError(){return true;}
window.onerror = blockError;
//  End -->