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radio re-click to cancel
    <form method="post">
    <input onclick="checked=chk=!chk;" onmouseover="chk=checked;" name="a" type="radio" value="1" />1</p>
    <input onclick="checked=chk=!chk;" onmouseover="chk=checked;" name="a" type="radio" value="2" />2</p>
    <input onclick="checked=chk=!chk;" onmouseover="chk=checked;" name="a" type="radio" value="3" />3<br />
    </form>