Rearranging div elements in functions.php file

I’m using the Smpl Skeleton theme at the moment, and I’m trying to understand how to move the div elements (or hooks, if that’s what they’re called?) in the functions.php page.

I want to move my #sidebar element inside the wrap container e.g.:

<div id=”wrap” class=”container”>
<div class=”sidebar” class=”ten columns” role=”complementary
<!–content goes here–>
</div>
</div>
<div id=”footer” columns=”sixteen columns”>
<!–content goes here–>
</div>

Thanks.