Folosesc wordpress si acolo am....nu stiu daca e bine ce pun
Asa e search.php:

Cod PHP:
<form id="searchform" method="get" action="<?php bloginfo('home'); ?>/">
    <div>
        <input id="s" name="s" type="text" value="<?php echo wp_specialchars($s1); ?>" size="5" tabindex="1" />
        <input id="searchsubmit" name="searchsubmit" type="submit" value="Find" tabindex="2"/>
    </div>
</form>
Si asta e htaccess

Cod:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress