It works... but the sidebar is not on the right side it is below the content-container.
I use this custom template code:
<?php
/*
Template Name: Forum
*/
get_header();
if (have_posts()) : while (have_posts()) : the_post();
if (!get_image('feature')) $imagesize = 'normal'; ?>
<!-- begin #content -->
<div id="forum">
<?php the_content(__('Read more'));?>
</div>
<?php endwhile; else: ?>
<p><?php _e('Not Found','BigFeature'); ?></p>
<?php endif; ?>
</div>
<!-- end #content -->
<?php get_sidebar('custom'); ?>
<?php get_footer(); ?>
and this css id:
#forum {
float:left;
width:730px;
margin-right: 50px;
}