2 column template with 2 posting zones

I have a template where the top header,menu are fixed and the content area and footer are mobile(liquid). The content area have 2 parts, 2 columns.Is made with layers , I can do it more easy with tables but I want layers.
I want to put content in both area in function of post id.
Here I have problems.
Also the content in the 2 areas is not similar, in one column is longer then in the other;The page background is black , and the columns background.
The css problem is that where the short colon finish the rest of the space is fill with page background.

I want to achive something similar with this
but this page is make with another cms.

`<?php if (have_posts()) : ?>

<?php while (have_posts()) : the_post(); ?>
<div id=mondo”>
<div id=”post-8″>
<h2><?php the_title(); ?></h2>
<small><?php the_time(‘F jS, Y’) ?> <!– by <?php the_author() ?> –>></small
></div>
<div >
<?php the_content(‘Read the rest of this entry »’); ?>
</div </div> <div id=mondo”>
<div id=”post-8″>
>
<h2><?php the_title(); ?></h2>
<small><?php the_time(‘F jS, Y’) ?> <!– by <?php the_author() ?> –>></small
></div>
<div >
<?php the_content(‘Read the rest of this entry »’); ?>
</div>
</div>
<?php endwhile; ?>

<?php else : ?>

<h2 class=”center”>Not Found</h2>
<p class=”center”>Sorry, but you are looking for something that isn’t here.</p>
<?php include (TEMPLATEPATH . “/searchform.php”); ?>

<?php endif; ?>