toggling a ajax form button

Hi I managed to get an ajax form working somewhat, something like the one below to be able to set and release a bookmark to a post. What I want to know is how can I change the submit button so that it toggles between the label, "Pin" and "Un-Pin" ?

<%= form_tag( snipmark_path(@post), :remote => true ) do %> <%= submit_tag "Pin" %> <% end %>

Right now the controller code get calls to set or release the bookmark to the post, but I am getting a error saying Rails can't find my view? I don't want to change the view. So along with change the submit button label, what do I need to do to make Rails happy about not find a view template?

Thanks,

ok I managed to figure out I can use link_to with :remote => true and then use jQuery to toggle the anchor text