ruby on rails - Why I can not get the facebook connect button with facebooker? -

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my rails version 2.3.4.

at first install gem

gem install facebooker

and add these code login page 

<script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/featureloader.js.php" type="text/javascript"></script>  <%= fb_connect_javascript_tag %> <%= init_fb_connect "xfbml" %>  <%= fb_login_and_redirect(facebook_login_users_path) %>

and add code application_controller

before_filter :set_facebook_session helper_method :facebook_session

but cannot see blue connect button!

i think miss something, can give me advice? thanks!

i found problem. if using jquery code need be:

<%= fb_connect_javascript_tag :js => :jquery %>

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