<script type="text/javascript">
 function view(key) {
  var obj = document.form.bbb1;
  var len = obj.length;
  while (len--) {
obj[len].style.visibility = "hidden";
obj[len].disabled = true;
  }
  obj[key].style.visibility = "visible";
  obj[key].disabled = false;
 }
</script>
<!--  -->
<form name='form'>
<tr>
<td>
    <table border="0" cellspacing="0" cellpadding="0" >
    <tr>
<td height="30">
<INPUT type="radio" name="aaa" onclick="view(0)" value="">자동차</td>
<td width="10" ></td>
<td><div id="div_1" style="visibility:hidden"><input type=text  name="bbb1">-<input type=text  name="bbb2">-<input type=text  name="bbb3"></div></td>
<td width="50" ></td>
<td height="30">
<INPUT type="radio" name="aaa" onclick="view(1)" value="">비행기</td>
<td width="10" ></td>
<td><div id="div_2"  style="visibility:hidden"><input type=text  name="bbb1">/<input type=text  name="bbb2">/<input type=text  name="bbb4">/<input type=text  name="bbb5">/<input type=text  name="bbb5"></div></td>
    </tr>
    </table>
</td>
</tr>
 </form>

일때 name=bbb2 , name=bbb3 , name=bbb4 , name=bbb5 도추가하고 싶습니다

조언 주시면 감사하겠습니다^^