Breaking a form into steps. Advice

I want to break a long form with many inputs into steps.
The form is just a basic one model.
There are file upload fields.

In this tutorial http://asciicasts.com/episodes/217-multistep-forms
they save the input data to the session, and I have a feeling this will not work, because a file cant be saved to a session(I'm guessing)

another option is to use the gem wicked to create a stateful configuration. Which is more than I need.

So I am hopeing for a easier integration which only uses JS.

Anyone have any advice?

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