[mod_python] mod_python upload meter / progressbar?

I've got a working upload script setup for my site however, it will just 
sit at the upload page until the upload is complete, and then it will 
show what I want next. I was wondering if there is a hopefully simple 
way of creating a progress meter to show how many bytes have been read 
and how many bytes are remaining. the read_length request member seems 
to show correctly the size of the file being uploaded, however 
"remaining" always reports zero for me. Perhaps I'm not using it in the 
correct place? Thanks.

Alex