Rails - Feb 2008 - how to write a bloc in helper to check/uncheck box ?

Hi all

I have a check box in form, and I would like to enable/disable it
according to the value of the check box..

<% form_for(:query, @query,....

<%= f.check_box(:all_categories, :disabled => true, :onchange
=>''javascript:all_categories();'') -%><%=l
:All_categories %>

I would like to have something like      :disabled => {
@query.all_categories.to_i == 1}
which will be evaluated as  true or false
but I cannot write it , get into error..

any suggestion ?

thanks a lot
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