How to retrieve value stored in hidden_field_tag in rails 3.1.4?
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We define a hidden_field_tag in new.html.erb for invoice controller like this:

    <%= hidden_field_tag :html_content_for_lease_record, '' %>

After assigning the new value to `:html_content_for_lease_record` with javascript(we can see the new value in html source page for the hidden field), how can we retrieve the new value from invoice controller? We tried `params[:html_content_for_lease_record]` and it returns nil. Thanks. 