Identification Bands theme (3 columns)

I’ve ben playing around with the 3 column Identification Bands theme and have made quite a few changes to it but what I really want to do is change the way it loads so that the header loads, followed by the main content loads on the left, then the 2 sidebars, then the footer.

At the moment, the ‘right-right’ sidebar loads, then the one on the left, then the main content.

At the moment, the code in the header currently says

<?php get_sidebar(); ?>
<div id="content">
<!-- end header -->

but if I swop the content and sidebar codes around, then everything gets squashed on the left and looks terrible!

Any thoughts?