Change Master Detail Grid Layout e.g. side by side
<table>
<tr><td>
<?php
...
GRID 1 (master)
...?>
<td>
<?php
...GRID 2 (detail)
...?>
</td>
<tr>
</table>
Obviously, there's more elegant way to do this without using table if you are familiar with CSS. Nevertheless, table is the simplest and gets job done.