Need help with rewrite rule

Hello all !

I could use some help setting up a rewrite rule.
This is what I want to do :
the URL http://www.domain.com/2007-001 should lead to www.domain.com/
somepage.php?id=2007-001
This is what I have :

<IfModule mod_rewrite.c>
Options +FollowSymlinks
RewriteEngine on
RewriteRule ^([^/]+)/?$ /somepage.php?id=$1 [QSA] [nc]
</IfModule>

This works if I'm working with a subdir (ie. http://www.domain.com/
subdir/2007-001) where the rewriterule is set inside the subdir and
the .php-file is placed in the root.

I'd like to remove the subdir, but it doesn't work. Somehow I must add
a condition stating that somepage.php must not be redirected, but I
honestly don't know how to do this... Can anyone help me ?


Regards,
Mathew