Search function problem

The search function does not seem to be working on my site: carsofchange.com.

Here is the associated php:

<div id="topnav">
	<div class="wrap">
<!-- end #topnav <p>
			<a rel="nofollow">"><?php _e("Posts", 'genesis'); ?></a>
			<a rel="nofollow">"><?php _e("Comments", 'genesis'); ?></a>-->
		 <p>
<form method="get" id="searchform" action="<?php bloginfo('home'); ?>/">
<input type="text" size="put_a_size_here" name="s" id="s" value="Search" onfocus="if(this.value==this.defaultValue)this.value='';" onblur="if(this.value=='')this.value=this.defaultValue;"/>
<input type="submit" id="searchsubmit" value="Search" class="btn" />
</form></p>
	</div><!-- end .wrap -->
</div><!-- end #topnav -->

[Please post code & markup between backticks or use the code button. Your posted code may now have been permanently damaged by the forum’s parser.]

Is there an error in here or where should I be looking for the problem?