Ruby on Rails

Hi,

I have a form that contains a file field.

Since the file can be rather big, I would like to display a progress bar
after the user clicks the submit button on the page, so he can see the
progress of the upload.

I've no idea how to do that, so I search on Google but lots of plugins
seem very old (so maybe irrelevant with Rails 2.3.5 that I'm using in
this project), some other are not very clear to me. Some use AJAX, some
use a combinaison of Flash and JS.
I would like something easy to use. It doesn't have to be sexy.

Could someone help ?

This project is under Rails 2.3.5 and Ruby 1.8.6, and I use prototype as
a JS lib.
I can Flash with no problem if needed. I just want something very basic
(even just displaying a text 0% to 100% would be ok), light and simple
to use.

Thanks
Lily
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