下拉框中 可编辑

<div style="position: relative;">
<span style="margin-left: 100px; width: 18px; overflow: hidden;">
<select style="width: 118px; margin-left: -100px"
onchange="this.parentNode.nextSibling.value=this.value">
                                <option value="-111">
   ---- 请选择/或填写-----
</option>
<option value="[e-mail]">
guobin
</option>
<option value="[e-mail]">
caoshun
</option>
</select>
</span>
<input name="box"
style="width: 100px; position: absolute; left: 0px;">
</div>