how to set the value of my checkbox?

hey all, I'm have a HABTM relationship and I'm trying to use checkbox. The problem is that I can't set the value of each checkbox sad each checkboth value gets set either to 1 or 0 depending on whether the it is checked or not. I would like the value to be equal to the id of my model. This is how I do it:

<% for cat in @categories %> <p><b><%=></b> <br /> <% for forum in cat.forums %> <%= check_box(:forums, :id ,:value=>, :checked => (forum.users.include? @user) ? 'checked' : false ) %><%= forum.forum_name %> <br />

<% end %> </p> <% end %>

I also tried without the :value=> but still nothing

Any idea?

thanx in advance