網頁禁止按右鍵

javascript code :

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("請尊重智慧財產權，謝謝。");
return false;
}
return true;
}
document.onmousedown=right;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
window.onmousedown=right;