글쓰기 라디오 필드 추가했는데, 글수정 버튼을 누르면 풀려보입니다. ㅠㅠ

<div class="form-group">    <label class="col-sm-2 control-label" for="wr_go">참여</label>
    <div class="col-sm-10">
        <label class="control-label sp-label">
            <input type="radio" name="wr_go" itemname="wr_go" value="0" <?php if($wr_go == "0") { echo "checked=\"checked\""; } ?> label="0"  required/> 간다
        </label>
        <label class="control-label sp-label">
            <input type="radio" name="wr_go" itemname="wr_go" value="1" <?php if($wr_go == "1") { echo "checked=\"checked\""; } ?> label="1"  required/> 안간다
        </label>
    </div>
</div>

<script>
window.onload = function(){
    var chk_value = "<?php echo $write['wr_go'];?>";
    var elements = document.getElementsByName('wr_go');
    for(var i=0; i<elements.length; i++)
        elements[i].checked = (elements[i].value == chk_value) ?  true : false;
};
</script>