Link Problems & Diverse Posts

I have currently a Problem and a help question with my site [http://www.mgarf.com/sk]

My Problem.

If you go to the site mentioned above and put your mouse over the links for the blog posts you get “http://mgarf.com/sk/%EF%BF%BDhttp://mgarf.com/sk/?p=6%EF%BF%BD” instead of the correct link. I am using the following coding for the post area:

<?php if(have_posts()) : ?>
		<?php while(have_posts()) : the_post(); ?>
        <div class="post" id=”post-<?php the_ID(); ?>”>
<h2 class="posttitle"><a href=”<?php the_permalink(); ?>“ title=”<?php the_title(); ?>”><?php the_title(); ?></a></h2>
<div Class="entry">
<?php the_content(); ?>
	<p class="postmetadata">
<?php _e('Filed under:'); ?>
 <?php the_category(', ') ?>
 <?php _e('by'); ?>
 <?php  the_author(); ?>

<?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?>
 <?php edit_post_link('Edit', ' | ', ''); ?>

Posted On: <?php the_date(); ?>
</div></div>
<?php endwhile; ?>
<div class=”navigation”>
<?php posts_nav_link(); ?>
</div>
<?php endif; ?>
</div>

My Help Question.

I’m trying to get my posts to have alternating backgrounds so the visitor can easily tell each post apart how would i go about doing that.

Any help would be greatly appreciated.