mod rewrite is not working in my template - php

Question

I have a htm/css template with what appears to be mod_rewrite rules:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d [OR]
RewriteCond %{REQUEST_FILENAME} gallery\_remote2\.php
RewriteCond %{REQUEST_URI} !/main\.php$
RewriteRule . - [L]
RewriteCond %{THE_REQUEST} /d/([0-9]+)-([0-9]+)/([^/?]+)(\?.|\ .)
RewriteCond %{REQUEST_URI} !/main\.php$
RewriteRule . /main.php?g2_view=core.DownloadItem&g2_itemId=%1&g2_serialNumber=%2&g2_fileName=%3 [QSA,L]
RewriteCond %{THE_REQUEST} /v/([^?]+)(\?.|\ .)
RewriteCond %{REQUEST_URI} !/main\.php$
RewriteRule . /main.php?g2_path=%1 [QSA,L]
RewriteRule ^presentation/([0-9]+)$ /presentation.php?id=$1
ErrorDocument 404 /notavailable.php
</IfModule>
This part is mine: RewriteRule ^presentation/([0-9]+)$ /presentation.php?id=$1
the url I have now is www.domain.com/presentation.php?id=1
and I want www.domain.com/presentation/1/
Mine is not working, and was wondering if my rules are wrong or conflictinf with the ones already there.
EDIT:
Ok I got this to work: RewriteRule ^presentation/([0-9]+)$ /presentation.php?id=$1 [L]
so www.domain.com/presentation/2 I want a rule with either no slash or slash at the end... but we cant deal with that later..
Now the problem is that although the id is being retrieved, the website acts as if there is a presentation directory, therefore all the relative paths like including the header don't work. Actually, I think the css links are broken.

Answer 1

Actually if you do want URL in the browser to change then have define your rewrite rule like this:
RewriteRule ^presentation/([0-9]+)$ /presentation.php?id=$1 [R=301,L]
That simply means return HTTP status 301 to the browser with the new URL.
And that way your problem of browser not finding image, css, image etc using relative paths will also be taken care of.