<html>
<head>
</head>
<script>
function togle(value){
var child = document.getElementById(value);
if(child.style.display == 'inline'){
child.style.display = "none";
}else{
child.style.display = "inline";
}
}
</script>
<body>
<table>
<tr>
<td onclick = "togle('a1_1')">1</td>
<td><td>
</tr>
<tr id = "a1_1" style = "display:inline">
<td></td>
<td>
<ul>
<li><a href = "#">1_1</a></li>
<li><a href = "#">1_2</a></li>
<li><a href = "#">1_3</a></li>
<li><a href = "#">1_4</a></li>
<li><a href = "#">1_5</a></li>
<li><a href = "#">1_6</a></li>
</ul>
</td>
<tr>
<td onclick = "togle('a2_1');">2</td>
<td><td>
</tr>
<tr id = "a2_1" style = "display:inline">
<td></td>
<td>
<ul>
<li><a href = "#">2_1</a></li>
<ul>
</td>
<tr>
<td onclick = "togle('a3_1');">3</td>
<td><td>
</tr>
<tr id = "a3_1" style = "display:inline">
<td></td>
<td>
<ul>
<li><a href = "#">3_1</a></td>
<ul>
</td>
<tr>
<td onclick = "togle('a4_1');">4</td>
<td><td>
</tr>
<tr id = "a4_1" style = "display:inline">
<td></td>
<td>
<ul>
<li><a href = "#">4_1</a></li>
</ul>
</td>
</tr>
</table>
</body>
</html>
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