#ejemplo:

link_to_remote "Delete this post", :update => "posts",
    :url  => post_url(@post), :method => :delete,
    :html => { :class  => "destructive" }


#el mio:

<div><%= button_to_remote "CONSUMER", :update => "mainBox",
			 :url => {:action => :mailing_lists1_consumer},
				:html => {:class => "btn-blue"} %></div>

#y no funciona :(