createrepo w/centos distribution

I'm having difficulties using createrepo (v.0.4.3) to re-create the
repodata for a local copy of a CentOS 5.x repository. The directory
layout is as follows:

    |-- CentOS
    |   |-- Cluster_Administration-as-IN-5.2-1.el5.centos.noarch.rpm
    |   |-- Cluster_Administration-bn-IN-5.2-1.el5.centos.noarch.rpm
    |   |-- Cluster_Administration-de-DE-5.2-1.el5.centos.noarch.rpm
    |   |-- Cluster_Administration-en-US-5.2-1.el5.centos.noarch.rpm
    [...snipped...]
    |-- images
    |   `-- stage2.img
    `-- repodata
        |-- filelists.xml.gz
        |-- other.xml.gz
        |-- primary.xml.gz
        `-- repomd.xml

    3 directories, 3232 files

It looks as though createrepo wants to create the repodata in the same
directory as the RPMs (so in this  case CentOS/repodata) so I've
specified the output directory and that writes the repodata files to the
correct place but the location of the RPMs in primary.xml is wrong (eg.
location href="db4-tcl-4.3.29-9.fc6.x86_64.rpm" when it should be
location href="CentOS/db4-tcl-4.3.29-9.fc6.x86_64.rpm"). The command
I've been using is "createrepo -p -o . -u CentOS CentOS".

Any advice would be gratefully appreciated!

Rgds,

Henry