iNove Theme: Navigation zerstört Design. Lösung?

/* header START */
#header {
        background:url(img/header.jpg) 0 0 no-repeat;
        height:273px;
}
#caption {
        height:44px;
        padding:100px 100px 21px;
}
#title a {
        text-decoration:none;
        color:#FFF;
        /*width:250px;*/
        height:30px;
        display:block;
        font-family:"Trajan Pro";
        letter-spacing:0;
}
/* image blog title */
/*
#title a {
        background:url(img/title.gif) no-repeat;
        text-decoration:none;
        color:#FFF;
        width:250px;
        height:30px;
        text-indent:-999em;
        display:block;
}
*/
#tagline {
        color:#FFF;
        border-top:1px solid #FFF;
        text-decoration:none;
        font-size:10px;
        float:left;
        padding:0 3px;
}
#navigation {
        margin:108px 0;
}
#menus li {
        display:inline;
        list-style:none;
}
#menus li a {
        background:transparent url(img/menu.gif) no-repeat;
        display:block;
        color:#382E1F;
        height:31px;
        line-height:31px;
        padding:0 20px;
        margin-left:-10px;
        text-decoration:none;
        font-size:11px;
        float:left;
        z-index:1;
}
#menus li a:hover {
        background-position:0 -31px;
}
#menus li.current_page_item a,
#menus li.current-cat a {
        background-position:0 -62px;
}
#menus li a.home {
        background-position:0 -93px;
        width:45px;
        padding:0;
        margin-left:0;
        text-indent:-999em;
}
#menus li a.home:hover {
        background-position:0 -124px;
}
#menus li.current_page_item a.home {
        background-position:0 -155px;
}
#menus li a.lastmenu:hover {
        background-position:0 0;
}
#searchbox {
        width:280px;
        float:right;
        padding:4px 70px;
}
#searchbox .textfield {
        line-height:16px;
        width:180px;
        float:right;
}
#searchbox .switcher {
        background:url(img/icons.gif) 0 0 no-repeat;
        float:right;
        width:18px;
        height:22px;
        line-height:16px;
        display:block;
        text-indent:-999em;
        float:right;
        padding:0 2px;
        height:16px;
        margin-top:3px;
}
/* header END */

/* sidebar START */
#sidebar {
        background:#F7F7F7;
        width:300px;
        float:right;
        font-size: 12px;
        background:#F7F7F7;
        line-height:145%;
        overflow:hidden;


}
#sidebar li {
        background:url(img/icons.gif) 0 -320px no-repeat;
        padding-left:22px;
        list-style:none;
        margin-top:5px;
        /*font-size:95%;*/
}
#sidebar .content,
#sidebar li {
        font-size:12px;
}

<?php get_header(); ?>
<?php $options = get_option('inove_options'); ?>


<?php if ($options['notice'] && $options['notice_content']) : ?>
        <div class="post" id="notice">
                <div class="content">
                        <?php echo($options['notice_content']); ?>
                        <div class="fixed"></div>
                </div>
        </div>
<?php endif; ?>


<?php if (have_posts()) : ?>
        <?php while (have_posts()) : the_post(); update_post_caches($posts); ?>
                <div class="post" id="post-<?php the_ID(); ?>">
                        <h2><a class="title" href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h2>
                        <div class="info">
                                <span class="date"><?php the_time(__('F jS, Y', 'inove')) ?></span>
                                <div class="act">
                                        <span class="comments"><?php comments_popup_link(__('No comments', 'inove'), __('1 comment', 'inove'), __('% comments', 'inove')); ?></span>
                                        <?php edit_post_link(__('Edit', 'inove'), '<span class="editpost">', '</span>'); ?>
                                        <div class="fixed"></div>
                                </div>
                                <div class="fixed"></div>
                        </div>
                        <div class="content">
                                <?php the_content(__('Read more...', 'inove')); ?>


                        <div class="related_posts">  Artikel, die dich auch interessieren k&ouml;nnten: <ul>


        </ul>
                                <p class="under">
                                        <?php if ($options['categories']) : ?><span class="categories"><?php the_category(', '); ?></span><?php endif; ?>
                                        <?php if ($options['tags']) : ?><span class="tags"><?php the_tags('', ', ', ''); ?></span><?php endif; ?>
                                </p>
                                <div class="fixed"></div>
                        </div>
                </div>
        <?php endwhile; ?>


<?php else : ?>
        <div class="errorbox">
                <?php _e('Sorry, no posts matched your criteria.', 'inove'); ?>
        </div>
<?php endif; ?>


<div id="pagenavi">
        <?php if(function_exists('wp_pagenavi')) : ?>
                <?php wp_pagenavi() ?>
        <?php else : ?>
                <span class="newer"><?php previous_posts_link(__('Newer Entries', 'inove')); ?></span>
                <span class="older"><?php next_posts_link(__('Older Entries', 'inove')); ?></span>
        <?php endif; ?>
        <div class="fixed"></div>
</div>


<?php get_footer(); ?>