target=”_blank” doesn’t appear to work

hi
im trying to make my footer social media links open in a new window when clicked. i have tried adding target=”_blank” but i think im just not adding it in the correct place on each link. im adding it right at the end after border=”0″ but the links still open in the same window.

my footer.php file:

<?php
/**
 * @package WordPress
 * @subpackage Default_Theme
 */
?>

<div class="clear"></div>

</div>
	</div>
    	</div>

</div>

<div id="footer" role="contentinfo">
	<div class="footer_content">       

       	<?php wp_page_menu('show_home=1&exclude=385, 389, 392, 398, 400, 404, 407&menu_class=footer_menu'); ?>

        <div class="footer_share_box">
            <img src="<?php bloginfo('template_url'); ?>/images/share1.gif" alt="" title="" border="0" />
            <a href="<?php echo get_option('home'); ?>/feed/rss/"><img src="<?php bloginfo('template_url'); ?>/images/rss.gif" alt="" title="" border="0" /></a>
            <a href="https://digg.com/submit?phase=2&url=<?php echo get_option('home'); ?>"><img src="<?php bloginfo('template_url'); ?>/images/digg.gif" alt="" title="" border="0" /></a>
            <a href="https://www.facebook.com/sharer.php?u=<?php echo get_option('home'); ?>"><img src="<?php bloginfo('template_url'); ?>/images/facebook.gif" alt="" title="" border="0" /></a>
            <a href="https://reddit.com/submit?url=<?php echo get_option('home'); ?>"><img src="<?php bloginfo('template_url'); ?>/images/reddit.gif" alt="" title="" border="0" /></a>
            <a href="https://twitthis.com/twit?url=<?php echo get_option('home'); ?>"><img src="<?php bloginfo('template_url'); ?>/images/twitter.gif" alt="" title="" border="0" /></a>
            <a href="https://www.stumbleupon.com/submit?url=<?php echo get_option('home'); ?>"><img src="<?php bloginfo('template_url'); ?>/images/stumble.gif" alt="" title="" border="0" /></a>
        </div>

        <div class="footer_copyright">
        www.artbyHerbie.com  &copy; 2009 - All Rights Reserved<br />
        Web Design by Herbie. Who did you think?<br />
        <a href="https://www.facebook.com/herbiehysteria=<?php echo get_option('home'); ?>"><img src="<?php bloginfo('template_url'); ?>/images/facebottom.gif" alt="Become a Fan!" title="" border="0" /></a>        <br />
        </div>

  </div>
</div>

</body>
</html>

regards
HH