<IfModule mod_rewrite.c>
   RewriteEngine on
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteRule ^(.*)$ index.php?s=$1 [QSA,PT,L] 
   RewriteCond %{QUERY_STRING} ^(.*)$
 </IfModule>