function sagtuskontrolu(e) {
if (navigator.appName == 'Netscape' && 
(e.which == 3 || e.which == 2)){
alert("Copyright (C) 2000-2001, Gürol CANBEK");
return false;
}
else if (navigator.appName == 'Microsoft Internet Explorer' && 
(event.button == 2 || event.button == 3)) {
alert("Copyright (C) 2000-2001, Gürol CANBEK");
return false;
}
return true;
}

document.onmousedown=sagtuskontrolu;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
window.onmousedown=sagtuskontrolu;