function eMailCh1(selectEmail2){
if(selectEmail2.value =='direct'){
$(selectEmail2).prev().attr("readonly",false);
$(selectEmail2).prev().focus();
}else{
$(selectEmail2).prev().val(selectEmail2.value);
$(selectEmail2).prev().attr("readonly",true);
}
}
<fieldset>
<legend>메일선택</legend>
<input type="text" id="gPersonEmail_0" name="gPersonEmail_0" class="input" style="width:150px;" title="메일계정" /> @
<input type="text" id="gPersonEmai2_0" name="gPersonEmai2_0" class="input" style="width:150px;" title="메일종류" />
<select id="selectEmail1" name="selectEmail1" title="메일종류 자동입력" onchange="eMailCh1(this);">
<option value="이메일 선택">이메일 선택</option>
<option value="hanmail.net">hanmail.net</option>
<option value="naver.com">naver.com</option>
<option value="chol.com">chol.com</option>
<option value="dreamwiz.com">dreamwiz.com</option>
<option value="empal.com">empal.com</option>
<option value="freechal.com">freechal.com</option>
<option value="gmail.com">gmail.com</option>
<option value="hanafos.com">hanafos.com</option>
<option value="hanmir.com">hanmir.com</option>
<option value="hitel.net">hitel.net</option>
<option value="hotmail.com">hotmail.com</option>
<option value="korea.com">korea.com</option>
<option value="lycos.co.kr">lycos.co.kr</option>
<option value="nate.com">nate.com</option>
<option value="netian.com">netian.com</option>
<option value="paran.com">paran.com</option>
<option value="yahoo.com">yahoo.com</option>
<option value="yahoo.co.kr">yahoo.co.kr</option>
<option value="direct">직접입력</option>
</select>
</fieldset>
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