multisite, .htaccess and rewrite

Hi,
I had drupal 5.1 installd at the root folder of my server (ie all drupal files were under the public_html folder).
To use multi site (single code base, different DBs), I set up a sites directory as follows:

and had both sites working.
now I am doing some cleanup to install a wiki and moved all drupal files to a drupal dir so now it looks like this

I have used the data from this post to edit my .htaccess.
The problem is that I can no longer access other sites then the main site.
any idea how to make this scheme support multi site?