'border-collapse' Example
<html>
<body>
<table id="myTable" border="1" style="border-collapse:collapse">
<tr>
<td>column 1</td>
<td>column 2</td>
<td>column 3</td>
</tr>
<tr>
<td>cell 1</td>
<td>cell 2</td>
<td>cell 3</td>
</tr>
<tr>
<td>cell 1</td>
<td>cell 2</td>
<td>cell 3</td>
</tr>
</table>
<button onclick="myTable.style.borderCollapse='separate'">separate</button>
<button onclick="myTable.style.borderCollapse='collapse'">collapse</button>
</body>
</html>
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