Get all checked checkbox!

hi,
I have the following problem:

product.controller.rb

class Product Controller

def show

end

end

show.html.rb
.
.
<% Product.find (: all). each do | product|
<% = Check_box “product”, “name”,: checked => false,: onchange =>
"# (remote_function (: url => (: controller => ‘product’,: action =>
‘show’) )) "%>

<% End%>
how can i get all the selected checkbox in the show-action(controller)?

Thanks im advance