error bug in radio box and for jquery mobile 1.3 and jquery 1.9

error bug in radio box and for jquery mobile 1.3 and jquery 1.9

found out an error like below example
<fieldset data-role="controlgroup" data-type="horizontal"  >
           <input type="radio" name="radio_regional" data-mini="true" id="regional_1" value="R1"  />
            <label  for="regional_1">regional1></label>
            <input type="radio" name="radio_regional" data-mini="true" id="regional_2" value="R2"  />
            <label  for="regional_2">regional2></label>
            <input type="radio" name="radio_regional" data-mini="true" id="regional_3" value="R3"  />
            <label  for="regional_3">regional3></label>                                   
</fieldset>

when u use the ajax bring in the value
i reset those to default
and set the value as radio_regional what i want

<script>
function ajax() {
jQuery('[name="radio_regional"]').attr("checked",false).checkboxradio("refresh");
jQuery('#regional_3"]').attr("checked",true).checkboxradio("refresh");
}
</script>

above ajax function does not working at 1.3 jquery mobile and jquery 1.9
but work at jquery mobile 1.2,