getting freakauth light login username

[eluser]alectrash[/eluser]
Does anyone know how to query the ci_sessions table with a logged in users session id to find that persons username with freakauth light.

I have linked a flash file uploader into my CI code but it needs to know where the uploaded file shall go and I want to put it in a folder with thatb person username.

A really secure way I feel would be to send the flash object the session id as a parameter.

Therefore if people saved the html page and modified the flash session parameer it would throw an error it wont work.

Any ideas anyone?