Aligning a search box

Apologies in advance because I know this is a n00b question, but help would be appreciated. I’m looking to align the search box in the following code to the right hand side and am unsure how to do it.

<div id="main">
<div id="nav">
<ul class="nav">
<li class="first"><a href="<?php bloginfo('url'); ?>">Home</a></li>
<?php wp_list_pages('title_li='); ?>
<?php include (TEMPLATEPATH . '/searchform.php'); ?>
</ul>
</div>
</div>

Many thanks,