selected checkbox in Controller!!!!

hi, I have the following problem:

product.controller.rb

class Product Controller

def show ..... end

end

show.rhtml.rb . .     <% Product.find (: all). each do | product|       <% = Check_box "product", "name",: checked => false,: onchange => "# (remote_function (: url => (: controller => 'product',: action => 'show') )) "%> <br> <% End%> how can i get all the selected checkboxes in the show-action(controller)?

Thnaks im advance