mb 여분필드 db에 들어가긴하는데 수정하려고하면 내용이 사라지네요.

div class="form-group has-feedback text-gap"><label class="col-sm-2 control-label" for="reg_mb_1"><b>분야</b><strong class="sound_only">필수</strong></label><div class="col-sm-3"><select name="mb_1" id="mb_1" required class="form-control input-sm nospace"><option value="">선택하세요</option><option value="A">A</option><option value="B">B</option></select></div></div> <div class="form-group has-feedback text-gap"><label class="col-sm-2 control-label" for="reg_mb_2"><b>2차 분야</b><strong class="sound_only">필수</strong></label><div class="col-sm-3"><select name="mb_2" id="mb_2" class="form-control input-sm nospace"> </select></div></div><script>var arr = []; var first = $('#mb_1'), second = $('#mb_2');var firstVal = '<?php echo $mb_1 ?>', secondVal = '<?php echo $mb_2 ?>';arr['A'] = ['1', '2']; arr['B'] = ['b1', 'b2', 'b3']; first.val(firstVal);second.val(secondVal);makeOption(firstVal); first.on('change', function() {	makeOption($(this).val());}); function makeOption(i) {	var html = '';	for (var x in  arr[i]) 		html += '<option value="' + arr[i][x] + '">' + arr[i][x] + '</option>';	second.html(html);}</script>