If you are dynamically creating an HTML table with number of table columns at runtime with equal sizes.
You have to do like this,
<style type="text/css">
.table {
width:100%;
}
.table td {
width:1000px;
}
</style>
<table class="table">
<tr>
<td>one</td>
<td>two</td>
<td>three</td>
<td>four</td>
<td> five</td>
<td> six </td>
</tr>
</table>