<tr align="left">
         <td>抄送人:</td>
         <td id="test"><input type="text" id="carbon" width="50">
          <select size=1 name="sd_carboncopy" id="sd_carboncopy">  
          <option value="">无</option>
           <%do while not rs.eof%>     
          <option value="<%=rs("username")%>"><%=rs("name")%></option>
          <%
          rs.movenext
          loop
          rs.close
          %>
          </select> 
        <input  type="button" value="add" onClick="setname('test');">
        <input  type="button" value="del" onClick="deleteAll('cp');"></td>
        <script>
function setname(obj)
{
    var copy=document.getElementById("sd_carboncopy").value;
        document.getElementById(obj).innerHTML += "<input type='checkbox' name='cp'>" + copy + "</input>";
    }
function deleteAll(obj){
    var answer = document.getElementsByName(obj)
    var len = answer.length;
    var checked = false;
    for(var i = 0 ; i < len ; i++)
    {
        if(answer[i].checked)
        {
            checked = true;
            break;
        }
    }
    if(checked)
    {
        return confirm("确定要删除吗?");
    }
    else
    {
        alert("对不起,你没有选择要删除的对象!");
        return false;
    }
}
</script>
        </tr>

  <input type="checkbox" name="aa" />a
  <input type="checkbox" name="aa" />b
  <input type="checkbox" name="aa" />c
  <input type="checkbox" name="aa" />d
  <input type="button" value="del" onclick="removechk()" />
  </div>
  <script type="text/javascript" >

  function removechk() {
  var os = document.getElementsByName("aa");
  for (var i = os.length-1; i >= 0; i--) {
      if (os[i].checked) {
          os[i].parentNode.removeChild(next(os[i], 3));//如果是删除下一个元素节点，则next(os[i], 1)
          os[i].parentNode.removeChild(os[i]);
  }
  }
}

function next(elem, nodetype) {//获得下一个节点
//节点类型，1 元素element，文本text 3,更多节点类型google:html nodetype
    do {
        elem = elem.nextSibling;
    } while (elem && elem.nodeType != nodetype);
    return elem;
}
  </script>