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("You can only use the Left mouse function, Please don`t use the right button");
        return false;
        }
        return true;
        }
        
        document.onmousedown=right;
        if (document.layers) window.captureEvents(Event.MOUSEDOWN);
        window.onmousedown=right;