怎么样使用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>

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