[Rails] counting a check_box selections?

Hello to everybody!

I have the following code in new.html.erb allowing a user to
select more questions (item) for creating a questionnaire:

...
<% for item in @itemss %>
<%= check_box_tag "questionnaire[item_ids][]", item.id,
@questionnaire.items.include?(item) %>
<a> <%= item.kind %> <span> <%= item.question %> </span> </a>
- "<%= item.denomination %>" - p.ti <%= item.score %> <br/>
<% end %>
...

I would like to show, while the user is making his choices, the
calculation of:
- the number of selected items
- the sum of the scores (each item has its own score)

any suggestions?

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