SO - 29812981

by Arun P Johny

HTML

<fieldset>
    <input type="radio" name="21" />
    <label for="21">Answer 21</label>
    <input type="radio" name="22" class="checked" />
    <label for="22">Answer 22</label>
    <input type="radio" name="23" class="" />
    <label for="23">Answer 23</label>
    <input type="radio" name="24" />
    <label for="24">Answer 24</label>
</fieldset>

<fieldset>
    <input type="radio" name="31" />
    <label for="31">Answer 31</label>
    <input type="radio" name="32" class="checked" />
    <label for="32">Answer 32</label>
    <input type="radio" name="33" class="" />
    <label for="33">Answer 33</label>
    <input type="radio" name="34" />
    <label for="34">Answer 34</label>
</fieldset>

JavaScript

$("input[type='radio']").click(function (event) {
    $(this).addClass("checked");    
    $(this).siblings('input[type="radio"]').prop('checked', false).removeClass('checked')
});