Determining Checkbox Checked or not?

<form method="POST" action="" name="myform">

<p><input type="checkbox" name="R1" value="V1">1</p>
<p><input type="checkbox" name="R1" value="V2" >2</p>
<p><input type="checkbox" name="R1" value="V3">3</p>
<p><input type="submit" value="submit" name="B1" ></p>
</form>
</body>
</html>

<%
rc = Request.Form("R1").Count
for i = 1 to rc
rv = Request.Form("R1")(i)
if rv = "V2" then
'V2 is selected
exit for
end if
next
%>