Here is my navbar in header.php
<!-- NAV -->
<div id="nav">
<ul>
<li><a href="<?php bloginfo('url'); ?>"><img src="<?php bloginfo('stylesheet_directory'); ?>/images/navbar/home.png" alt="Ad image" /></a></li>
<li><a href="<?php bloginfo('url'); ?>"><img src="<?php bloginfo('stylesheet_directory'); ?>/images/navbar/nav2.png" alt="Ad image" /></a></li>
<li><a href="<?php bloginfo('url'); ?>"><img src="<?php bloginfo('stylesheet_directory'); ?>/images/navbar/nav3.png" alt="Ad image" /></a></li>
<li><a href="<?php bloginfo('url'); ?>"><img src="<?php bloginfo('stylesheet_directory'); ?>/images/navbar/nav4.png" alt="Ad image" /></a></li>
<li><a href="<?php bloginfo('url'); ?>"><img src="<?php bloginfo('stylesheet_directory'); ?>/images/navbar/nav5.png" alt="Ad image" /></a></li>
<li><a href="<?php bloginfo('url'); ?>"><img src="<?php bloginfo('stylesheet_directory'); ?>/images/navbar/nav6.png" alt="Ad image" /></a></li>
<?php wp_list_categories('title_li='); ?>
</ul>
</div>
<!-- END NAV -->
How do I get each button to go to there respected pages? If I add in a category through the dashboard it adds in a text based link. I just want the images to represent the different categories, any thoughts?