Hi, I might be able to assist you with this but I need to have a look at the files to determine what you mean by your webmaster creating a drupal 7 site in the drupal 6 site. I'm assuming you mean there is a sub folder within the drupal 6 site that has drupal 7 in it. From that, I can help you more in getting to the point of you getting a local copy on your computer for development purposes. I am available from today if you respond back to me quickly.
Please read my reviews for added confidence.
Thanks
Respectfully
Risharde