htaccess 404 not redirecting sub directories

Hi all I am using the following code in my htacccess file which redirects 404s to my custom 404 page:

ErrorDocument 404 /404.php

This works perfectly when the link is www.mysite.com/nothinghere.html

however when the site is www.mysite.com/nothing/here.html

or any further amount of subdirectories it does not work.

Here is my complete htaccess file in case it is one of the other rules causing this problem (which I think it might be):

#--- DH-PHP handlers ---
AddHandler fastcgi-script fcg fcgi fpl
AddHandler php-fastcgi .php
Action php-fastcgi /cgi-bin/dispatch.fcgi

# Begin Ultimate SEO V2.2d
Options +FollowSymLinks
RewriteEngine On
# RewriteBase instructions
# Change RewriteBase dependent on how your shop is accessed as below.
# http://www.mysite.com = RewriteBase /
# http://www.mysite.com/catalog/ = RewriteBase /catalog/
# http://www.mysite.com/catalog/shop/ = RewriteBase /catalog/shop/
# Change the following line using the instructions above

RewriteBase /
RewriteRule ^(.*)-p-(.*).html$ product_info.php?products_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-c-(.*).html$ index.php?cPath=$2&%{QUERY_STRING}
RewriteRule ^(.*)-m-(.*).html$ index.php?manufacturers_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-pi-(.*).html$ popup_image.php?pID=$2&%{QUERY_STRING}
RewriteRule ^(.*)-by-(.*).html$ all-products.php?fl=$2&%{QUERY_STRING}
RewriteRule ^(.*)-t-(.*).html$ articles.php?tPath=$2&%{QUERY_STRING}
RewriteRule ^(.*)-a-(.*).html$ article_info.php?articles_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-au-(.*).html$ articles.php?authors_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-pr-(.*).html$ product_reviews.php?products_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-pri-(.*).html$ product_reviews_info.php?products_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-f-(.*).html$ faqdesk_info.php?faqdesk_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-fc-(.*).html$ faqdesk_index.php?faqPath=$2&%{QUERY_STRING}
RewriteRule ^(.*)-fri-(.*).html$ faqdesk_reviews_info.php?faqdesk_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-fra-(.*).html$ faqdesk_reviews_article.php?faqdesk_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-i-(.*).html$ information.php?info_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-links-(.*).html$ links.php?lPath=$2&%{QUERY_STRING}
RewriteRule ^(.*)-pm-([0-9]+).html$ info_pages.php?pages_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-n-(.*).html$ newsdesk_info.php?newsdesk_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-nc-(.*).html$ newsdesk_index.php?newsPath=$2&%{QUERY_STRING}
RewriteRule ^(.*)-nri-(.*).html$ newsdesk_reviews_info.php?newsdesk_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-nra-(.*).html$ newsdesk_reviews_article.php?newsdesk_id=$2&%{QUERY_STRING}
RewriteRule ^(.*)-po-([0-9]+).html$ pollbooth.php?pollid=$2&%{QUERY_STRING}
# End Ultimate SEO V2.2d

ErrorDocument 404 /404.php

I am mistaken. It is actually working. The problem is the style sheets are not attaching correctly because they are relative to the site root.

annnd fixed... needed a base href tag on the page..