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Distinguishing Mouse buttons

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Demo 
Right Click here


Code
<HTML><HEAD>
<script language="javascript">
function click(e) {
if (navigator.appName == 'Netscape'
&& e.which == 3) {
alert("no right click please")
return false;
}
else {
if (navigator.appName == 'Microsoft Internet Explorer'
&& event.button==2)
alert("no right click please")
return false;
}
return true;
}
document.onmousedown=click
</script>
</HEAD>
<BODY>
No right mouse button here!
</BODY></HTML>
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