collection_select and ajax using remote_function and observe_field


<% remote_function :url => {:action => 'show_something'} %>

<% collection_select(:widget, :categories_id, Category.find(:all, rder => "name"), :id, :name, {:prompt => "-Select a category"}, :id => 'id_selected') %>

<% observe_field 'id_selected', :url => {:action => 'show_something'}, :with => 'id' %>