두개 중 하나의 값만 입력하는 방법 채택완료

</p><p><script type="text/javascript"></p><p><span class="Apple-tab-span" style="white-space:pre">			</span>$(document).ready(function(e){</p><p><span class="Apple-tab-span" style="white-space:pre">				</span>function chg(idx){</p><p><span class="Apple-tab-span" style="white-space:pre">				</span>if(idx=="1"){</p><p><span class="Apple-tab-span" style="white-space:pre">					</span>$("#wr_6").prop('readonly', true);</p><p><span class="Apple-tab-span" style="white-space:pre">					</span>$("#wr_6").val("");</p><p><span class="Apple-tab-span" style="white-space:pre">					</span>}else if(idx=="2"){</p><p> </p><p><span class="Apple-tab-span" style="white-space:pre">					</span>$("#wr_7").prop('readonly', true);</p><p><span class="Apple-tab-span" style="white-space:pre">					</span>$("#wr_7").val("");</p><p><span class="Apple-tab-span" style="white-space:pre">					</span>}</p><p><span class="Apple-tab-span" style="white-space:pre">				</span>}</p><p><span class="Apple-tab-span" style="white-space:pre">			</span>});</p><p><span class="Apple-tab-span" style="white-space:pre">		</span></script></p><p> </p><p> </p><p><input type="text" name="wr_4" value="<?php echo $wr_4 ?>" id="wr_4" class="frm_input" size="20" maxlength="20" required onchange="chg('1')"></p><p><span class="Apple-tab-span" style="white-space:pre">			</span></p><p><span class="Apple-tab-span" style="white-space:pre">			</span><select name='wr_6' id='wr_6' style="width:98px;height:24px;" onchange="chg('2')"></p><p><span class="Apple-tab-span" style="white-space:pre">				</span><option value=''>직접입력</option></p><p>