wp-content/themes/default/searchform.php

   1 <form method="get" id="searchform" action="<?php bloginfo('home'); ?>/">
   2 <div><input type="text" value="<?php echo attribute_escape($s); ?>" name="s" id="s" />
   3 <input type="submit" id="searchsubmit" value="Search" />
   4 </div>
   5 </form>