How to change sites/default/files directory permissions

I have Drupal currently running and am installing the Theme Hues module for my users to select their own background and colors.

The module writes the temporary CSS style sheet to one of the sub-directories under the sites/default/files directory which I created when first installing Drupal using my Filezilla FTP client.

The sites/default/files has been given the user name and group of "apache" instead of my drupal user and group name. So far, from my troubleshooting on the Theme Hues module (everything else works great), this seems to be the problem.

I need to change the "files" directory user and group using Drupal if it is possible. I have tried to contact my server, I run a virtual dedicated server and they will not help because they say that this has to be done in Drupal.

I know I can run a chown command using ssh on my Plesk server and am currently looking for the root password. Any other suggestions or ways to change the directory user and group to the Drupal admin on the sites/default/files directory?

www.sightloss.info

Thanks for your time and efforts.

_{Edited by WorldFallz - moved to appropriate forum.}