In order to group radios they need to share common name
. The checked property is then managed by browser
HTML copied directly from jQueryUI radio demo
<input type="radio" id="radio1" name="radio"><label for="radio1">Choice 1</label>
<input type="radio" id="radio2" name="radio" checked="checked"><label for="radio2">Choice 2</label>
<input type="radio" id="radio3" name="radio"><label for="radio3">Choice 3</label>