Column order in s9y

If you would like to swap the position of the left and center columns so your theme looks like my 'Carl Green' theme, simply replace the above lines with the following;

<table id="mainpane">
<tr>
<td id="content" valign="top">{$CONTENT}</td>
{if $leftSidebarElements > 0}
<td id="serendipityLeftSideBar" valign="top">{serendipity_printSidebar side="left"}</td>
{/if}
{if $rightSidebarElements > 0}
<td id="serendipityRightSideBar" valign="top">{serendipity_printSidebar side="right"}</td>
{/if}
</tr>
</table>

Alternatively. if you would like to swap your center and right columns, so that both sidebars appear on the left of your content pane, then this code will do the trick;

<table id="mainpane">
<tr>
{if $leftSidebarElements > 0}
<td id="serendipityLeftSideBar" valign="top">{serendipity_printSidebar side="left"}</td>
{/if}
{if $rightSidebarElements > 0}
<td id="serendipityRightSideBar" valign="top">{serendipity_printSidebar side="right"}</td>
{/if}
<td id="content" valign="top">{$CONTENT}</td>
</tr>
</table>

Having made these minor changes to your index.tpl, you may notice that your columns don't seem to sit right. In some themes the columns have margins or padding that needs to be adjusted to make everything fit together. This is easily done, and simply involves opening your style.css file, finding #content, #serendipityLeftSideBar, #serendipityRightSideBar and making the relevant changes.