Topic: checkboxes

okay I'm having alittle problem with checkboxes and turning them on

I have a db like this
leaders - many_to_many
user_id
squad_id

in the leaders model I have this def

  def self.of_squad(squad, user)
    find(:first,
         :conditions => ["user_id = ? and squad_id = ?", user, squad])
  end

in the view I have this code
    <% for squad in @squads -%>
    <% leader = Leader.of_squad(squad.id, @user.id) -%>
   
    <li>
    <%= squad.name %> - [<%= squad.tag %>]
    <%= check_box(:leader, :squad_id, {}, "1", "0") %>
    </li>
    <% end -%>

it does'nt bring up any errors but I cant get the checkboxes to be selected when they should be.

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