Code
<SCRIPT language=Javascript1.2>
<!--
var message='нехорошо воровать!!';
function click(e)
{if (document.all) {if (event.button == 2) {alert(message);return false;}}
if (document.layers) {if (e.which == 3) {alert(message);return false;}}}
if (document.layers) {document.captureEvents(Event.MOUSEDOWN);}
document.onmousedown=click;
// -->
</SCRIPT>