Social Network Icons

http://img19.imageshack.us/img19/8933/beztytuufbw.png

Witam, chcialbym zmienic adres docelowy ikon w sidebear,dokladnie chodzi mi o zmiane adresu po kliknieciu na dana ikonke, mam tu przykladowy kod z pliku sidebear.php

<div class="span-8 last">

	<div class="sidebar">

     <?php if(get_theme_option('socialnetworks') != '') {
    		?>
    			<div class="addthis_toolbox">
    			    <div class="custom_images">
    			            <a class="addthis_button_twitter"><img src="<?php bloginfo('template_directory'); ?>/images/socialicons/twitter.png" width="32" height="32" alt="Twitter" /></a>
    			            <a class="addthis_button_delicious"><img src="<?php bloginfo('template_directory'); ?>/images/socialicons/delicious.png" width="32" height="32" alt="Delicious" /></a>
    			            <a class="addthis_button_facebook"><img src="<?php bloginfo('template_directory'); ?>/images/socialicons/facebook.png" width="32" height="32" alt="Facebook" /></a>
    			            <a class="addthis_button_digg"><img src="<?php bloginfo('template_directory'); ?>/images/socialicons/digg.png" width="32" height="32" alt="Digg" /></a>
    			            <a class="addthis_button_stumbleupon"><img src="<?php bloginfo('template_directory'); ?>/images/socialicons/stumbleupon.png" width="32" height="32" alt="Stumbleupon" /></a>
    			            <a class="addthis_button_favorites"><img src="<?php bloginfo('template_directory'); ?>/images/socialicons/favorites.png" width="32" height="32" alt="Favorites" /></a>
    			            <a class="addthis_button_more"><img src="<?php bloginfo('template_directory'); ?>/images/socialicons/more.png" width="32" height="32" alt="More" /></a>
    			    </div>
    			    <script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js?pub=xa-4a65e1d93cd75e94"></script>
    			</div>
    			<?php
    	}
    ?>

    <?php if(get_theme_option('ads_125') != '') {
		?>
		<div class="sidebaradbox">
			<?php sidebar_ads_125(); ?>
		</div>
	<?php } ?>

nie rorozumiem zbytnio tego kodu , gdzie tu jest odnosnik url do danego obrazka, np facebboka lub twittera? pozdrawiam