js问题请教，下拉菜单报错

下述是一个下拉菜单 但是有问题请懂行的人指点
<script>
 i = 1;
function dian_add(){
  document.getElementById("d").innerHTML+='<div id="div_'+i+'">
                                                                单位：<select name="bu_men" id="bu_men">
                                                                      <option value="" selected="selected">
                                                                      </option><%do while not rs100.eof%>
                                                                      <option value="<%=rs100("bu_men")%>"><%=rs100("bu_men")%></option>
                                                                      <%rs100.movenext %>
                                                                      <%loop%>
                                                                      <input type="button" value="删除"  onclick="del('+i+')"/>
                                              </div>';
  i = i + 1;
}
function del(o){ document.getElementById("d").removeChild(document.getElementById("div_"+o));}
</script>