collection_select and remote_function used together?

Hi there I have this code <%= collection_select 'address', 'address', @addresses, :id, :address, {},         { :onchange => remote_function(:url => { :action => 'show_order', :controller => 'addresses', :id => @user },                                       :update => 'adrdiv') }%>

the @user id is passed but not the address id of the picked option in the select how do I pass both at the same time?

thanks in advance