CKFinder integration ASP.NET MVC3 - dynamic path

After some struggling I was able to integrate ckfinder in my project. I have one issue left at the moment.

In the config.ascx I try to set my path like this

companyID = General.GetCompanyIdByUsername(Context.User.Identity.Name);
BaseUrl = "/Content/Profiles/" + companyID + "/editor/";

I have multiple users, so I would like to assign a different folder per user based on the username.

While opening the file manager popup, the correct folder is taken. When I try to upload files, it seems that Context.User.Identity.Name is unknown and therefore upload to an incorrect folder. I assume that the User is unknown in that context because of the popup... (I don't have this problem when I set a fix username)

Session var ain 't working either with me.

Is there a way to set that baseUrl via javascript in my View somehow while connecting ckfinder to the editor?

var editor = CKEDITOR.replace("profiel_lange_beschrijving", { toolbar: 'Full' });
CKFinder.setupCKEditor(editor, '/Content/ckfinder');