Modifying contribution "Disable right click"

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http://forums.oscommerce.com/viewtopic.php?p=204962#204962
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I've installed this contribution and it's cool and all, but does anyone know if it could be modified to block Opera as well?

Also how would one modify this so that the code affects enlarged product image java pop up windows as well?

The contribution is basically...
Paste this into your catalog/includes/header.php

[code]<script language=javascript>
<!-- Begin
function right(e) {
var msg = "Right-clicking is not possible in this document.";
if (navigator.appName == 'Netscape' && e.which == 3) {
alert(msg);
return false;
}
else
if (navigator.appName == 'Microsoft Internet Explorer' &&
event.button==2) {
alert(msg);
return false;
}
return true;
}
document.onmousedown = right;
// End -->
-->
</script>[/code]