how to do redirects to files in sub directories

[shaddf]

I have such a directory structure:

httpdocs/    .htaccess    index.phpmain/     splash.php     home.php    app/        app.php

    images/        hello.png            images1/        hello2.png    js/        jquery.js    css/        style.css

how can i do urlrewriting to all files in sub folders,so that my app can be seo friendly.I have tried this:

<IfModule mod_rewrite.c>
# Enable mod_rewrite
RewriteEngine On
# Specify the folder in which the application resides.
# Use / if the application is in the root.
RewriteBase /httpdocs
# Rewrite to correct domain to avoid canonicalization problems
# RewriteCond %{HTTP_HOST} !^www\.yyy\.com
# RewriteRule ^(.*)$ http://www.yyy.com/$1 [R=301,L]
# Rewrite URLs ending in /index.php or /index.html to /
RewriteCond %{THE_REQUEST} ^GET\ .*/index\.(php|html?)\ HTTP
RewriteRule ^(.*)index\.(php|html?)$ $1 [R=301,L]
# Rewrite category pages
RewriteRule ^.*-d([0-9]+)/.*-c([0-9]+)/page-([0-9]+)/?$ home.php?Depart
mentId=$1&CategoryId=$2&Page=$3 [L]
RewriteRule ^.*-d([0-9]+)/.*-c([0-9]+)/?$ home.php?DepartmentId=$1&Cate
goryId=$2 [L]

But it returns me to the: localhost

Index of /httpdocs/main Name Last modified Size Description Parent Directory   -  

what can I do to clear this??

note relative links to home.php are in splash.php which take me to home.php -the activity page