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function del()
{
    var f = document.form1;
    var reply_check = f['reply_check[]'];
    var length = reply_check.length;
    var i; var chked = 0;
    for(i=0; i<length; i++) { if(reply_check[i].checked == true) chked = 1; break; }
    if(chked == 0)
    {
        alert('삭제할 답변을 선택해주세요.');
        return;
    }
}
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