用javascript设置嵌套表格的显示和隐藏

 <script language="javascript">
function setdiv(divname) {
    var obj = document.getElementById(divname);
    if (obj.style.display == "none") {
        obj.style.display = "table-row";
    } else {
        obj.style.display = "none";
    }
}
</script>

<table bgcolor="#999999" border="1" width="240">
  <tr>
    <td width="80">1111111111111111111111</td>
    <td width="80">2222222222222222222222</td>
    <td width="80">3333333333333333333333</td>
  </tr>
  <div>
  <tr id="t" style="display:none">
     <td width="80">aaaaaaaaaaaaaaaaaaaaaa</td>
     <td width="80">bbbbbbbbbbbbbbbbbbbbbb</td>
     <td width="80">cccccccccccccccccccccc</td>
  </tr>
  </div>
  <tr>
    <td width="80">4444444444444444444444</td>
    <td width="80">5555555555555555555555</td>
    <td width="80">6666666666666666666666</td>
  </tr>

</table>