searching the blog

Hi there,

I am just trying to edit some of the code but I can’t find out where the method for performing the search is located ? Any ideas which file is the one?

This is the code for the search form:
<h2><label for=”s”><?php _e(‘Search:’); ?></label></h2>
<form id=”searchform” method=”get” action=”<?php echo $PHP_SELF; ?>”>
<div>
<input type=”text” name=”s” id=”s” size=”17″ class=”navi-search” />
<input type=”submit” name=”submit” value=”<?php _e(‘Search’); ?>” class=”search-button” />
</div>