js实现可输入的下拉框

<HTML>
 <HEAD>
 <META http-equiv='Content-Type' content='text/html; charset=gb2312'>
 <TITLE>js实现可输入的下拉框</TITLE>
 </HEAD>
 <BODY>
 <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="德国">德国</option>
 <option value="挪威">挪威</option>
 <option value="瑞士"> 瑞士</option>
 </select></span><input name="box" style="width:100px;position:absolute;left:0px;">
 </div>
 </BODY>
 </HTML>

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