htaccess help

[jtdeveloper]

Hi all. Can anybody possibly help me with my htaccess file. It's got a problem in there somewhere which is stopping everything from working but for the life of me I can't see where. I'm only doing 2 things: ensuring www is used as the main url, and making search engine-friendly urls. Also if anybody knows how to change the "offers" bit so that I don't have to enter every offer page (rather, it processess any "pos=XX" dynamically) that would be awesome.

thanks all...

Options -Multiviews
RewriteEngine On
RewriteBase /

# Force search engines to use www.someurl.co.uk
RewriteCond %{HTTP_HOST} !^www\.someurl\.co\.uk$
RewriteRule ^(.*) http://www.someurl.co.uk/$1 [R=301,L]

# Specify search friendly URLs
RewriteRule ^top-ten$ /index.php [L]
RewriteRule ^what-is-it$ /what-is-it.php [L]
RewriteRule ^contact-us$ /contact-us.php [L]
RewriteRule ^offer-1$ /offer.php?pos=1 [L]
RewriteRule ^offer-2$ /offer.php?pos=2 [L]
RewriteRule ^offer-3$ /offer.php?pos=3 [L]
RewriteRule ^offer-4$ /offer.php?pos=4 [L]
RewriteRule ^offer-5$ /offer.php?pos=5 [L]
RewriteRule ^offer-6$ /offer.php?pos=6 [L]
RewriteRule ^offer-7$ /offer.php?pos=7 [L]
RewriteRule ^offer-8$ /offer.php?pos=8 [L]
RewriteRule ^offer-9$ /offer.php?pos=9 [L]
RewriteRule ^offer-10$ /offer.php?pos=10 [L]

[Rowsdower!]

This is what I use to force a "www" prefix:

RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

I'm not sure if your version is the cause of your problem or not, but I at least like the portability of my version.

For the second part, I think your syntax is backwards (your match and replacement are reversed). And to get the numbered items into a single line you use a regular expression match instead of the literal string you are trying to match. Try this (untested):

#note: I'm not sure if the question mark needs to be escaped or not, but I went ahead and escaped it...
RewriteRule ^(offer.php\?pos=[0-9]) offer-1$ [L]